Mock Test 2

Q1. Which virus was the first to be crystallised, demonstrating the protein nature of viruses? HPRCA-pat.

1. Bacteriophage T4
2. Tobacco Mosaic Virus (TMV)
3. HIV-1
4. Cauliflower Mosaic Virus

Answer: B — Tobacco Mosaic Virus (TMV)

W. M. Stanley crystallised TMV in 1935, proving viruses had a reproducible molecular structure; this work earned him the 1946 Nobel Prize in Chemistry.

Q2. The Baltimore classification of viruses is primarily based on which criterion? HPRCA-pat.

1. Host range and tissue tropism
2. Capsid symmetry and envelope presence
3. Nature of the genome and its relationship to mRNA
4. Replication site within the host cell

Answer: C — Nature of the genome and its relationship to mRNA

David Baltimore (1971) grouped viruses into seven classes based on genome type (DNA/RNA, ss/ds, +/− sense) and the pathway used to produce mRNA, unifying viral replication strategies.

Q3. Assertion (A): A viroid differs from a prion in that a viroid contains nucleic acid whereas a prion does not.
Reason (R): Viroids are circular ssRNA molecules that infect plants without a protein coat.HPRCA-pat.

1. Both A and R are true, and R is the correct explanation of A
2. Both A and R are true, but R is NOT the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Answer: A — Both A and R are true, and R is the correct explanation of A

Viroids (Diener, 1971) are naked circular ssRNA; prions (Prusiner, 1982) are misfolded proteins with no nucleic acid. R correctly explains why A is true.

Q4. In the lysogenic cycle of bacteriophage λ, the integrated phage genome is called: HPRCA-pat.

1. Provirus
2. Prophage
3. Virion
4. Capsomere

Answer: B — Prophage

When a temperate phage such as λ integrates into the bacterial chromosome it is termed a prophage. The equivalent in animal retroviruses is the provirus.

Q5. Which of the following statements about the Gram stain is INCORRECT? HPRCA-pat.

1. Gram-positive bacteria have a thick peptidoglycan layer
2. Lipopolysaccharide (LPS) is a component of the Gram-negative outer membrane
3. Gram-negative bacteria stain purple after crystal violet treatment
4. Decolourisation with alcohol removes the dye from Gram-negative cells

Answer: C — Gram-negative bacteria stain purple after crystal violet treatment

Gram-negative cells lose the crystal violet–iodine complex during alcohol decolourisation and appear pink (safranin counter-stain). Only Gram-positive cells retain the purple colour.

Q6. Match the following algal classes with the pigments that characterise them:

1. 1-S, 2-P, 3-R, 4-Q
2. 1-P, 2-S, 3-Q, 4-R
3. 1-S, 2-Q, 3-R, 4-P
4. 1-R, 2-P, 3-S, 4-Q

Answer: A — 1-S, 2-P, 3-R, 4-Q

Chlorophyceae (green algae) contain Chl a + b; Phaeophyceae (brown algae) contain fucoxanthin; Rhodophyceae (red algae) have phycoerythrin; Cyanophyceae (blue-green) have phycocyanin.

Q8. Guchchi (morel mushroom), a prized wild edible collected in Himachal Pradesh, belongs to which fungal division? HP-spec.

1. Basidiomycota
2. Ascomycota
3. Zygomycota
4. Deuteromycota

Answer: B — Ascomycota

Morchella esculenta (guchchi) is an ascomycete; its fruiting body bears asci within cup-shaped apothecia. It commands very high market prices in HP's Kullu and Lahaul-Spiti districts.

Q9. Which tissue system in dicot stems is responsible for the lateral transport of water and solutes between the xylem and phloem? HPRCA-pat.

1. Epidermis
2. Vascular rays (medullary rays)
3. Endodermis
4. Pericycle

Answer: B — Vascular rays (medullary rays)

Vascular (medullary) rays are bands of parenchyma that radiate between vascular bundles in the stem, facilitating radial (lateral) transport of assimilates and water.

Q10. In which type of venation are the veins arranged parallel to each other along the length of the leaf, typically seen in monocots? HPRCA-pat.

1. Reticulate venation
2. Pinnate venation
3. Parallel venation
4. Palmate venation

Answer: C — Parallel venation

Parallel venation is characteristic of monocot leaves (e.g., grass, maize). Dicots typically exhibit reticulate (net) venation with a prominent midrib branching into a network.

Q11. The Casparian strip in root endodermis is composed mainly of: HPRCA-pat.

1. Cellulose and pectin
2. Suberin and lignin
3. Cutin and wax
4. Sporopollenin

Answer: B — Suberin and lignin

The Casparian strip is a band of suberin (and sometimes lignin) deposited in the radial and transverse walls of endodermal cells, blocking apoplastic movement of water and solutes into the stele.

Q13. Secondary growth in dicot stems is initiated by the activity of: HPRCA-pat.

1. Apical meristem
2. Intercalary meristem
3. Vascular cambium and cork cambium
4. Pericycle only

Answer: C — Vascular cambium and cork cambium

The vascular (intrafascicular + interfascicular) cambium produces secondary xylem (wood) and secondary phloem, while the cork cambium (phellogen) gives rise to the periderm replacing the epidermis.

Q14. A student observes a T.S. of a stem with scattered vascular bundles, each surrounded by a bundle sheath, lacking cambium. This is characteristic of: HPRCA-pat.

1. Dicot stem
2. Monocot stem
3. Dicot root
4. Gymnosperm stem

Answer: B — Monocot stem

Monocot stems have closed (no cambium), scattered vascular bundles each enclosed by a sclerenchymatous bundle sheath, and lack a distinct cortex–pith differentiation.

Q15. Which modification of root assists mangrove plants in oxygen uptake in waterlogged habitats? HPRCA-pat.

1. Prop roots
2. Pneumatophores (breathing roots)
3. Velamen roots
4. Haustorial roots

Answer: B — Pneumatophores (breathing roots)

Pneumatophores grow vertically upward out of the anaerobic mud in mangroves (e.g., Avicennia, Rhizophora); they bear lenticels through which atmospheric O₂ diffuses to submerged tissues.

Q16. The floral formula ⇯ K(5) C(5) A(9+1) G₁ belongs to which family? HPRCA-pat.

1. Solanaceae
2. Fabaceae (Leguminosae)
3. Brassicaceae
4. Liliaceae

Answer: B — Fabaceae (Leguminosae)

Fabaceae is characterised by zygomorphic flower, pentamerous calyx and corolla (papilionaceous), diadelphous androecium (9+1 stamens) and a monocarpellary superior ovary (G₁).

Q17. During the light-dependent reactions of photosynthesis, water is split to release oxygen by the process called: HPRCA-pat.

1. Photophosphorylation
2. Photolysis (Hill reaction)
3. Carbon fixation
4. Photorespiration

Answer: B — Photolysis (Hill reaction)

Robin Hill (1939) demonstrated that isolated chloroplasts could evolve O₂ when illuminated in the presence of an artificial oxidant. Photolysis of water at PS II releases O₂, protons and electrons.

Q18. In the Calvin cycle, how many ATP and NADPH molecules are consumed to fix one molecule of CO₂ into glyceraldehyde-3-phosphate? HPRCA-pat.

1. 1 ATP and 1 NADPH
2. 2 ATP and 1 NADPH
3. 3 ATP and 2 NADPH
4. 2 ATP and 2 NADPH

Answer: C — 3 ATP and 2 NADPH

Fixation of one CO₂ (producing one triose-phosphate) in the Calvin cycle requires 3 ATP and 2 NADPH; to synthesise one glucose (6 CO₂), 18 ATP and 12 NADPH are needed.

Q19. The enzyme that catalyses the first step of photorespiration, incorrectly fixing O₂ instead of CO₂, is: HPRCA-pat.

1. PEP carboxylase
2. Rubisco (RuBisCO)
3. Pyruvate carboxylase
4. Phosphoglycerate kinase

Answer: B — Rubisco (RuBisCO)

RuBisCO has dual oxygenase/carboxylase activity. When O₂ concentration is high (as in C₃ plants at midday), it acts as an oxygenase, producing phosphoglycolate, initiating photorespiration.

Q20. Which plant hormone promotes cell elongation in the subapical zone and is synthesised primarily in young leaves and shoot apices? HPRCA-pat.

1. Cytokinin
2. Abscisic acid
3. Ethylene
4. Auxin (IAA)

Answer: D — Auxin (IAA)

Indole-3-acetic acid (IAA) is the principal auxin, produced in shoot apices and young leaves. It promotes cell elongation by activating H⁺-ATPases, loosening cell walls (acid-growth hypothesis).

Q22. The long-day plant (LDP) flowers when the photoperiod exceeds a critical daylength. Which of the following is a correctly identified LDP? HPRCA-pat.

1. Tobacco (Nicotiana tabacum)
2. Soybean (Glycine max)
3. Spinach (Spinacia oleracea)
4. Chrysanthemum

Answer: C — Spinach (Spinacia oleracea)

Spinach is a classic LDP requiring >13–14 h light to flower. Tobacco, soybean and chrysanthemum are short-day plants that flower when daylength falls below their critical photoperiod.

Q23. Vernalisation refers to the promotion of flowering by: HPRCA-pat.

1. Exposure to blue light
2. Prolonged exposure to low temperature
3. Application of gibberellins in warm conditions
4. Increase in day length beyond 12 hours

Answer: B — Prolonged exposure to low temperature

Vernalisation (Latin ver = spring) involves chilling (0–7 °C) for several weeks; it prevents premature flowering and ensures plants flower in spring. Gibberellins can partially substitute for vernalisation in some species.

Q24. In angiosperms, triple fusion involves the union of: HPRCA-pat.

1. One male gamete + egg cell + secondary nucleus
2. Two male gametes + one polar nucleus
3. One male gamete + two polar nuclei
4. Two male gametes + egg cell

Answer: C — One male gamete + two polar nuclei

Triple fusion forms the primary endosperm nucleus (PEN / triploid 3n) when the second male gamete fuses with the two polar nuclei in the central cell. This, together with syngamy (egg + male gamete), constitutes double fertilisation.

Q25. Apomixis is defined as: HPRCA-pat.

1. Seed germination without a dormancy period
2. Formation of seeds without fertilisation
3. Vegetative propagation through runners
4. Cross-pollination between genetically identical plants

Answer: B — Formation of seeds without fertilisation

Apomixis (= away from mixing) produces seeds asexually, without meiosis or fertilisation, maintaining maternal genotype. It is commercially important in hybrid seed production to perpetuate hybrid vigour.

Q27. The mature embryo sac of a typical angiosperm contains how many cells and nuclei respectively? HPRCA-pat.

1. 7 cells, 8 nuclei
2. 8 cells, 8 nuclei
3. 7 cells, 7 nuclei
4. 6 cells, 7 nuclei

Answer: A — 7 cells, 8 nuclei

The Polygonum-type embryo sac has 7 cells: 3 antipodal cells, 2 synergids, 1 egg cell and 1 central cell containing 2 polar nuclei, totalling 8 nuclei.

Q28. In gymnosperms, the naked seeds are borne on: HPRCA-pat.

1. Enclosed ovaries (carpels)
2. Sporophylls of strobili (cones)
3. Gametophytic prothalli
4. Underground rhizomes

Answer: B — Sporophylls of strobili (cones)

Gymnosperms bear ovules directly on the megasporophylls of a cone (strobilus) without enclosure in an ovary, hence seeds are naked. Cedrus deodara (HP state tree) is a gymnosperm.

Q29. Which of the following correctly states the ploidy of endosperm in a typical angiosperm after double fertilisation? HPRCA-pat.

1. Haploid (n)
2. Diploid (2n)
3. Triploid (3n)
4. Tetraploid (4n)

Answer: C — Triploid (3n)

Triple fusion: 1 male gamete (n) + 2 polar nuclei (n + n) = triploid (3n) primary endosperm nucleus. Endosperm nourishes the developing embryo.

Q31. Which of the following phyla is characterised by a water-vascular system and radial symmetry in adults? HPRCA-pat.

1. Annelida
2. Echinodermata
3. Mollusca
4. Arthropoda

Answer: B — Echinodermata

Echinoderms (starfish, sea urchins) possess a unique water-vascular (ambulacral) system of fluid-filled canals operating tube feet for locomotion; adults show pentaradial symmetry though larvae are bilaterally symmetrical.

Q32. The phylum Platyhelminthes is acoelomate. Which of the following features BEST explains this term? HPRCA-pat.

1. They lack a definite head
2. They have no body cavity between gut and body wall
3. They lack a complete digestive system
4. They are exclusively parasitic

Answer: B — They have no body cavity between gut and body wall

Acoelomate means there is no fluid-filled cavity; the space between ectoderm-derived body wall and the endoderm-lined gut is filled with mesodermal parenchyma (mesenchyme).

Q34. Flame cells (solenocytes) are the osmoregulatory/excretory structures in which phylum? HPRCA-pat.

1. Nematoda
2. Annelida
3. Platyhelminthes
4. Mollusca

Answer: C — Platyhelminthes

Flatworms use flame cells (protonephridia) whose beating cilia create a flickering flame-like appearance; they collect excess water and solutes by ultrafiltration and expel them via excretory pores.

Q35. Match the following animal phyla with their correct type of coelom:

1. 1-R, 2-P, 3-Q, 4-S
2. 1-P, 2-R, 3-Q, 4-S
3. 1-R, 2-Q, 3-P, 4-S
4. 1-S, 2-P, 3-Q, 4-R

Answer: A — 1-R, 2-P, 3-Q, 4-S

Annelids have a true coelom (mesodermal lining); nematodes are pseudocoelomate; flatworms are acoelomate; arthropods have a haemocoel (blood-filled sinus) as the primary body cavity.

Q36. Notochord, dorsal hollow nerve cord and pharyngeal gill slits are defining features of phylum: HPRCA-pat.

1. Hemichordata
2. Echinodermata
3. Chordata
4. Urochordata only

Answer: C — Chordata

All three features (notochord, dorsal hollow nerve cord, pharyngeal pouches) must be present at some stage of development. Hemichordata is excluded because they lack a true notochord; urochordata and cephalochordata are sub-phyla of Chordata.

Q37. Which of the following is NOT a distinguishing feature of class Mammalia? HPRCA-pat.

1. Hair or fur on the body
2. Three middle-ear ossicles
3. Scales covering the entire body surface
4. Mammary glands in females

Answer: C — Scales covering the entire body surface

Scales covering the body are characteristic of Reptilia (and fish). Mammals are defined by hair, endothermy, three middle-ear ossicles (malleus, incus, stapes) and mammary glands.

Q38. Which type of epithelial tissue lines the inner surface of blood vessels and is specialised for filtration and diffusion? HPRCA-pat.

1. Stratified squamous epithelium
2. Simple columnar epithelium
3. Simple squamous (pavement) epithelium
4. Transitional epithelium

Answer: C — Simple squamous (pavement) epithelium

The endothelium lining blood vessels and the mesothelium lining body cavities are simple squamous epithelia; their flat, tightly-fitting cells minimise diffusion distance and resist shear forces from blood flow.

Q39. Haversian canals (osteonal canals) running longitudinally are characteristic of: HPRCA-pat.

1. Hyaline cartilage
2. Dense regular connective tissue
3. Compact (lamellar) bone
4. Spongy (cancellous) bone

Answer: C — Compact (lamellar) bone

Compact bone is organised into osteons (Haversian systems): concentric lamellae of mineralised matrix surrounding a central Haversian canal containing blood vessels and nerves; lacunae between lamellae house osteocytes.

Q40. In Pheretima (earthworm), the blood is: HPRCA-pat.

1. Colourless, with haemocyanin
2. Red, with haemoglobin dissolved in plasma
3. Red, with haemoglobin in erythrocytes
4. Blue, with haemocyanin in plasma

Answer: B — Red, with haemoglobin dissolved in plasma

Earthworm blood contains dissolved (erythrocruorin-type) haemoglobin freely in plasma rather than enclosed in red blood cells; this gives it a red colour unlike most invertebrates that use haemocyanin.

Q41. The tympanal organ of cockroach is located on which segment? HPRCA-pat.

1. First abdominal segment
2. Prothoracic legs
3. Metathoracic legs
4. Last abdominal segment (anal cerci)

Answer: A — First abdominal segment

Cockroaches (Periplaneta) possess a pair of tympanal organs (for vibration detection) on the first abdominal sternite, unlike grasshoppers whose tympana are also on the first abdominal segment but more laterally placed.

Q42. The Malpighian tubules of insects open into the: HPRCA-pat.

1. Foregut, near the oesophagus
2. Midgut–hindgut junction
3. Haemocoel directly
4. Labial gland ducts

Answer: B — Midgut–hindgut junction

Malpighian tubules are blind-ended tubes that float in haemolymph and open into the gut at the midgut–hindgut junction; they extract nitrogenous waste (uric acid) from haemolymph and deposit it into the hindgut for excretion.

Q43. The site of maximum absorption of digested food products in humans is the: HPRCA-pat.

1. Stomach
2. Duodenum
3. Jejunum and ileum (small intestine)
4. Large intestine (colon)

Answer: C — Jejunum and ileum (small intestine)

Villi, microvilli (brush border) and circular folds (plicae circulares) of the small intestine enormously increase surface area for absorption of amino acids, monosaccharides, fatty acids and vitamins.

Q44. Which component of blood is primarily responsible for maintaining osmotic pressure of plasma? HPRCA-pat.

1. Fibrinogen
2. Albumin
3. Immunoglobulin G
4. Haemoglobin

Answer: B — Albumin

Albumin is the most abundant plasma protein (~60%); it generates the bulk of colloid osmotic (oncotic) pressure, retaining water in the capillaries. Loss of albumin (nephrotic syndrome) causes oedema.

Q46. The oxygen–haemoglobin dissociation curve shifts to the RIGHT (decreased O₂ affinity) under which of the following conditions? HPRCA-pat.

1. Decreased temperature, decreased CO₂, increased pH
2. Increased temperature, increased CO₂, decreased pH
3. Decreased 2,3-BPG, decreased CO₂, increased pH
4. Increased pH, fetal haemoglobin, decreased temperature

Answer: B — Increased temperature, increased CO₂, decreased pH

The Bohr effect: increased CO₂, decreased pH (acidosis) and raised temperature all lower Hb's O₂ affinity (right shift), facilitating O₂ release to metabolically active tissues.

Q47. Nephrons that dip deep into the medulla and have long loops of Henle are called: HPRCA-pat.

1. Cortical nephrons
2. Juxtamedullary nephrons
3. Macula densa nephrons
4. Fenestrated nephrons

Answer: B — Juxtamedullary nephrons

Juxtamedullary nephrons (~15%) have glomeruli near the corticomedullary junction and long loops of Henle extending deep into the medulla; they are critical for producing concentrated urine via the countercurrent multiplier mechanism.

Q48. The function of the hormone ADH (vasopressin) in the kidney is to: HPRCA-pat.

1. Increase Na⁺ reabsorption in the proximal tubule
2. Increase water permeability of the collecting duct
3. Stimulate aldosterone release from the adrenal medulla
4. Decrease GFR by constricting the afferent arteriole

Answer: B — Increase water permeability of the collecting duct

ADH (from posterior pituitary) inserts aquaporin-2 channels into collecting duct cells, increasing water reabsorption and producing concentrated urine; low ADH → large volumes of dilute urine (diabetes insipidus).

Q49. During muscle contraction, which change in sarcomere dimensions is CORRECT according to the sliding-filament model? HPRCA-pat.

1. A-band shortens; I-band and H-zone remain unchanged
2. I-band and H-zone shorten; A-band length unchanged
3. A-band and I-band both shorten equally
4. H-zone widens; I-band narrows

Answer: B — I-band and H-zone shorten; A-band length unchanged

Sliding filament theory (Huxley & Hanson, 1954): thick (myosin) filaments remain fixed in length (A-band unchanged); thin (actin) filaments slide in, shortening the I-band (actin-only zone) and H-zone (myosin-only zone).

Q50. The correct sequence of events during spermatogenesis is: HPRCA-pat.

1. Spermatogonia → Primary spermatocyte → Secondary spermatocyte → Spermatid → Spermatozoa
2. Spermatogonia → Spermatid → Primary spermatocyte → Secondary spermatocyte → Spermatozoa
3. Primary spermatocyte → Spermatogonia → Spermatid → Spermatozoa
4. Spermatogonia → Secondary spermatocyte → Primary spermatocyte → Spermatid → Spermatozoa

Answer: A — Spermatogonia → Primary spermatocyte → Secondary spermatocyte → Spermatid → Spermatozoa

Spermatogonia (2n) undergo mitosis to primary spermatocytes (2n), then meiosis I → secondary spermatocytes (n), then meiosis II → spermatids (n), which undergo spermiogenesis to mature spermatozoa.

Q51. Human chorionic gonadotropin (hCG) is produced by the: HPRCA-pat.

1. Anterior pituitary after implantation
2. Corpus luteum of the ovary
3. Trophoblast cells of the early embryo
4. Endometrium of the uterus

Answer: C — Trophoblast cells of the early embryo

hCG is produced by syncytiotrophoblast after implantation; it maintains the corpus luteum's progesterone production, preventing menstruation. hCG detection in urine is the basis of pregnancy tests.

Q52. The acrosome of a sperm cell is derived from which organelle? HPRCA-pat.

1. Mitochondria
2. Endoplasmic reticulum
3. Golgi apparatus
4. Centriole

Answer: C — Golgi apparatus

During spermiogenesis the Golgi apparatus forms the acrosomal vesicle that caps the anterior nucleus, storing hydrolytic enzymes (acrosin, hyaluronidase) needed for penetrating the zona pellucida at fertilisation.

Q53. Fertilisation in humans normally occurs in the: HPRCA-pat.

1. Ovary
2. Uterus
3. Ampulla of the fallopian tube
4. Cervix

Answer: C — Ampulla of the fallopian tube

The egg is fertilised in the ampullary–isthmic junction (commonly stated as ampulla) of the fallopian tube. Implantation occurs later in the uterine endometrium approximately 6–7 days post-fertilisation.

Q54. Which contraceptive method works primarily by preventing sperm transport through the male reproductive tract via vas deferens ligation? HPRCA-pat.

1. Vasectomy
2. Tubectomy
3. Copper-T IUD
4. Oral contraceptive pill (OCP)

Answer: A — Vasectomy

Vasectomy is male surgical sterilisation: the vas deferens is cut and tied, preventing sperm from being ejaculated. Tubectomy is the female equivalent; IUDs and OCPs use different mechanisms.

Q55. Which of the following STIs is caused by a bacterium and can be treated with penicillin? HPRCA-pat.

1. HIV/AIDS
2. Syphilis (Treponema pallidum)
3. Genital herpes (HSV-2)
4. Genital warts (HPV)

Answer: B — Syphilis (Treponema pallidum)

Syphilis, caused by the spirochaete Treponema pallidum, remains sensitive to penicillin G (drug of choice). Viral STIs (HIV, HSV-2, HPV) are not cured by antibiotics.

Q56. MTP (Medical Termination of Pregnancy) in India is legally permitted up to how many weeks of pregnancy under the MTP Amendment Act 2021? HP-spec.

1. 12 weeks unconditionally; up to 20 weeks with one doctor's approval
2. Up to 20 weeks unconditionally; 24 weeks for special categories with two doctors
3. Up to 24 weeks for all women with a single registered medical practitioner
4. No upper limit if foetal abnormality is detected

Answer: B — Up to 20 weeks unconditionally; 24 weeks for special categories with two doctors

The MTP Amendment Act 2021 allows termination up to 20 weeks by a single RMP and up to 24 weeks for vulnerable categories (rape survivors, minors, women with disabilities) with approval of two RMPs. Beyond 24 weeks, a Medical Board decides for severe foetal anomalies.

Q57. Test-tube baby technology refers to which assisted reproductive technique? HPRCA-pat.

1. Intrauterine insemination (IUI)
2. In-vitro fertilisation followed by embryo transfer (IVF-ET)
3. Gamete intra-fallopian transfer (GIFT)
4. Zygote intra-fallopian transfer (ZIFT)

Answer: B — In-vitro fertilisation followed by embryo transfer (IVF-ET)

IVF-ET involves fertilisation of ova by sperm in a controlled laboratory setting (in vitro), then transfer of the resultant embryo(s) into the uterus. Louise Brown (1978) was the first IVF-ET 'test-tube baby'.

Q58. In a dihybrid cross between AaBb × AaBb, what fraction of offspring will show both dominant phenotypes (A_B_)? HPRCA-pat.

1. 1/16
2. 3/16
3. 9/16
4. 12/16

Answer: C — 9/16

Standard Mendelian dihybrid ratio is 9:3:3:1. A_B_ (both dominant) = 9/16 when genes are on separate chromosomes assort independently (Mendel's Law of Independent Assortment).

Q59. Haemophilia A is caused by deficiency of clotting factor VIII and follows which inheritance pattern? HPRCA-pat.

1. Autosomal dominant
2. Autosomal recessive
3. X-linked recessive
4. Y-linked (holandric)

Answer: C — X-linked recessive

The Factor VIII gene is on the X chromosome; females (XX) can be carriers without symptoms, while males (XY) with the defective allele express the disease. The condition is much more common in males.

Q60. The Hardy-Weinberg principle states that allele frequencies in a population remain constant when: HPRCA-pat.

1. Natural selection is the only evolutionary force acting
2. Population is large, random mating, no selection, no mutation, no migration
3. Only mutation is absent; all other forces may operate
4. Population is small and isolated to prevent gene flow

Answer: B — Population is large, random mating, no selection, no mutation, no migration

H-W equilibrium requires: large population (no genetic drift), random mating (panmixia), no natural selection, no mutation, no gene flow (migration). Violations of any condition cause allele frequencies to change (evolution).

Q61. The fluid-mosaic model of the plasma membrane was proposed by: HPRCA-pat.

1. Watson and Crick
2. Singer and Nicolson
3. Robertson
4. Davson and Danielli

Answer: B — Singer and Nicolson

Singer and Nicolson (1972) proposed the fluid-mosaic model: a phospholipid bilayer in which proteins 'float' as a mosaic, able to move laterally. The earlier Davson–Danielli (1935) model placed proteins only at surfaces.

Q62. Which organelle is the site of oxidative phosphorylation and is often called the 'powerhouse of the cell'? HPRCA-pat.

1. Ribosome
2. Endoplasmic reticulum
3. Mitochondrion
4. Peroxisome

Answer: C — Mitochondrion

The inner mitochondrial membrane bears the electron transport chain and ATP synthase (Complex V); oxidative phosphorylation (chemiosmosis) generates the bulk of cellular ATP (~32 ATP/glucose aerobically).

Q64. The enzyme responsible for joining Okazaki fragments on the lagging strand during DNA replication is: HPRCA-pat.

1. DNA helicase
2. DNA primase
3. DNA ligase
4. DNA polymerase I

Answer: C — DNA ligase

After DNA polymerase I removes RNA primers and fills gaps, DNA ligase seals the nick between Okazaki fragments by forming a phosphodiester bond, completing the lagging strand.

Q65. In eukaryotes, mRNA processing before translation includes all of the following EXCEPT: HPRCA-pat.

1. 5′ 7-methylguanosine cap addition
2. 3′ poly-A tail addition
3. Splicing out of introns
4. Conversion of uracil to thymine

Answer: D — Conversion of uracil to thymine

mRNA contains uracil, not thymine; there is no such processing step. The three correct steps (5′ capping, 3′ polyadenylation, splicing) convert pre-mRNA into mature mRNA ready for cytoplasmic translation.

Q66. Enzyme-catalysed reactions lower the activation energy (E_a) of a reaction. Which model best explains enzyme specificity? HPRCA-pat.

1. Lock-and-key model (Fisher, 1894)
2. Induced-fit model (Koshland, 1958)
3. Both models equally explain specificity
4. Allosteric model (Monod–Wyman–Changeux)

Answer: B — Induced-fit model (Koshland, 1958)

The induced-fit model better explains specificity: the active site changes shape to precisely complement the substrate upon binding. The rigid lock-and-key model (Fisher) cannot account for enzyme flexibility or allosteric regulation.

Q67. A biochemist runs an SDS-PAGE gel. The protein bands migrate based primarily on: HPRCA-pat.

1. Isoelectric point of the protein
2. Native charge of the protein
3. Molecular weight of the polypeptide
4. Secondary structure (helices vs. sheets)

Answer: C — Molecular weight of the polypeptide

SDS (sodium dodecyl sulphate) denatures proteins and coats them with uniform negative charge proportional to mass; migration through the polyacrylamide gel depends on size (MW), not native charge or structure.

Q68. In a testcross (backcross) involving a dihybrid organism, a ratio of 1:1:1:1 among offspring indicates: HPRCA-pat.

1. Complete dominance with linkage
2. Independent assortment of both gene pairs
3. Complete linkage with no crossing-over
4. Incomplete dominance

Answer: B — Independent assortment of both gene pairs

In a testcross (AaBb × aabb), independent assortment yields four phenotypic classes in equal proportions (1:1:1:1). Linkage without recombination gives only parental classes (1:1), and linkage with crossing-over gives unequal ratios.

Q69. Which of the following describes the phenomenon of pleiotropy? HPRCA-pat.

1. Multiple alleles controlling a single character
2. A single gene affecting multiple phenotypic traits
3. Two genes collaborating to produce one trait
4. A dominant allele masking expression of a recessive allele

Answer: B — A single gene affecting multiple phenotypic traits

Pleiotropy: one gene, multiple phenotypic effects. Classic example: PKU gene mutation causes intellectual disability, light pigmentation and musty odour. Sickle-cell anaemia is another pleiotropic condition.

Q71. The lac operon in E. coli is under which type of control in the absence of lactose and presence of glucose? HPRCA-pat.

1. Positive induction — operon is ON
2. Negative repression — operon is OFF
3. Catabolite repression ON, operon active
4. Constitutive expression regardless of substrates

Answer: B — Negative repression — operon is OFF

Without lactose, the lac repressor protein (produced by lacI) binds the operator, blocking transcription. Glucose further suppresses the operon via catabolite repression (CAP site inactive). The operon turns on only when lactose is present and glucose is absent.

Q72. Restriction endonuclease EcoRI cuts at the palindromic sequence 5′-GAATTC-3′, producing: HPRCA-pat.

1. Blunt ends
2. 5′ overhangs (sticky ends)
3. 3′ overhangs (sticky ends)
4. Nick in one strand only

Answer: B — 5′ overhangs (sticky ends)

EcoRI cuts between G and AATTC on both strands in a staggered fashion, producing 4-nucleotide 5′ overhangs (AATT). These cohesive (sticky) ends facilitate directional ligation with other fragments cut by the same enzyme.

Q73. The Human Genome Project (HGP) was officially completed in: HPRCA-pat.

1. 1990
2. 1997
3. 2000 (draft) / 2003 (complete)
4. 2010

Answer: C — 2000 (draft) / 2003 (complete)

HGP launched 1990; working draft announced June 2000 by Clinton/Blair; full sequence published April 2003, coinciding with the 50th anniversary of Watson and Crick's double helix paper.

Q74. Bt cotton is produced by inserting a gene from: HPRCA-pat.

1. Bacillus cereus
2. Bacillus thuringiensis
3. Bacillus subtilis
4. Pseudomonas fluorescens

Answer: B — Bacillus thuringiensis

The Cry (crystal delta-endotoxin) genes from B. thuringiensis encode proteins toxic to specific insect larvae (e.g., Helicoverpa bollworm) when solubilised in the alkaline insect midgut; Bt cotton was India's first GM crop, approved 2002.

Q75. PCR (Polymerase Chain Reaction) uses a heat-stable DNA polymerase from: HPRCA-pat.

1. Escherichia coli
2. Thermus aquaticus (Taq polymerase)
3. Saccharomyces cerevisiae
4. Pyrococcus furiosus (for initial PCR only)

Answer: B — Thermus aquaticus (Taq polymerase)

Taq polymerase, isolated from the thermophile Thermus aquaticus (found in Yellowstone hot springs), can withstand the 94–95 °C denaturation step in PCR cycles without denaturing, enabling automated amplification.

Q76. The concept of an ecological niche was first elaborated by: HPRCA-pat.

1. Charles Darwin
2. G. E. Hutchinson
3. Ernst Haeckel
4. Odum

Answer: B — G. E. Hutchinson

G. E. Hutchinson (1957) defined the niche as an n-dimensional hypervolume of environmental conditions within which a species can survive and reproduce. Haeckel coined the term 'ecology' (1866); Darwin proposed natural selection.

Q77. In a food chain, energy transfer efficiency between successive trophic levels is typically: HPRCA-pat.

1. 90%
2. 50%
3. 10% (ten-percent law)
4. 1%

Answer: C — 10% (ten-percent law)

Lindeman's ten-percent law (1942): approximately 10% of energy stored at one trophic level is incorporated into the next. The rest is lost as heat (metabolism), excretion and respiration.

Q78. The Gause's competitive exclusion principle states that: HPRCA-pat.

1. Predators and prey always coexist in stable cycles
2. Two species occupying the exact same niche cannot coexist indefinitely
3. Competition between species always leads to extinction of both
4. Sympatric speciation requires competitive exclusion

Answer: B — Two species occupying the exact same niche cannot coexist indefinitely

Gause (1934) experimentally showed that when two Paramecium species with identical resource needs were cultured together, one invariably displaced the other — competitive exclusion. Coexistence requires niche differentiation.

Q80. The term 'biomagnification' refers to: HPRCA-pat.

1. Increase in total biomass at higher trophic levels
2. Progressive increase in concentration of non-biodegradable toxins through a food chain
3. Reduction of chemical toxins by bacteria at lower trophic levels
4. Magnification of image of organisms under a microscope

Answer: B — Progressive increase in concentration of non-biodegradable toxins through a food chain

Lipid-soluble, non-biodegradable compounds like DDT, mercury and PCBs accumulate in fatty tissues and concentrate at each successive trophic level (biomagnification/bioaccumulation). Top predators receive the highest doses.

Q81. Which greenhouse gas has the highest Global Warming Potential (GWP) over a 100-year horizon per unit mass? HPRCA-pat.

1. Carbon dioxide (CO₂)
2. Methane (CH₄)
3. Nitrous oxide (N₂O)
4. Sulphur hexafluoride (SF₆)

Answer: D — Sulphur hexafluoride (SF₆)

SF₆ has GWP of ~23,500 over 100 years, far exceeding N₂O (298), CH₄ (28) and CO₂ (1). Though emitted in small quantities, its atmospheric longevity makes it extremely potent.

Q82. The ozone layer depletion over the Antarctic is mainly caused by: HPRCA-pat.

1. Volatile organic compounds from forests
2. Chlorofluorocarbons (CFCs) releasing chlorine radicals under UV
3. Industrial SO₂ emissions
4. Nitric oxide from agricultural runoff

Answer: B — Chlorofluorocarbons (CFCs) releasing chlorine radicals under UV

UV radiation in the stratosphere breaks CFC molecules, releasing Cl• radicals that catalytically destroy ozone (Cl• + O₃ → ClO• + O₂). Each Cl atom can destroy up to 100,000 ozone molecules.

Q83. BOD (Biochemical Oxygen Demand) is used to measure: HPRCA-pat.

1. Total dissolved oxygen in a water body
2. Amount of organic pollution in water based on oxygen consumed by decomposers
3. pH of industrial effluent
4. Turbidity of water due to suspended solids

Answer: B — Amount of organic pollution in water based on oxygen consumed by decomposers

BOD measures the O₂ consumed by microorganisms decomposing organic matter in water over 5 days at 20 °C. High BOD indicates high organic pollution; clean river water has BOD <3 mg/L.

Q84. The Silent Valley National Park, a significant biodiversity hotspot, is located in: HP-spec.

1. Himachal Pradesh
2. Kerala
3. Assam
4. Uttarakhand

Answer: B — Kerala

Silent Valley NP is in the Nilgiri Hills, Kerala, part of the Western Ghats biodiversity hotspot — one of India's 4 biodiversity hotspots. Great Himalayan NP in HP is the Himalayan hotspot representative.

Q85. Which Indian city hosted the Convention on Biological Diversity's COP-11 in 2012? HPRCA-pat.

1. New Delhi
2. Mumbai
3. Hyderabad
4. Chennai

Answer: C — Hyderabad

CBD COP-11 (October 2012) was held in Hyderabad; the Hyderabad Pledge for biodiversity finance was adopted. The Nagoya Protocol on Access and Benefit Sharing (ABS) had been adopted at COP-10 in Nagoya, Japan (2010).

Q86. Stanley Miller and Harold Urey (1953) demonstrated the abiotic synthesis of organic molecules by simulating conditions of early Earth. Which gas mixture did they use? HPRCA-pat.

1. O₂, N₂, CO₂, H₂O
2. CH₄, NH₃, H₂, H₂O (reducing atmosphere)
3. CO₂, SO₂, N₂, H₂O
4. H₂S, CO, HCN, H₂O

Answer: B — CH₄, NH₃, H₂, H₂O (reducing atmosphere)

Miller–Urey simulated the primitive reducing atmosphere with CH₄ (methane), NH₃ (ammonia), H₂ and H₂O with electrical sparks simulating lightning, producing amino acids and other organic molecules within a week.

Q87. Analogous structures are those that: HPRCA-pat.

1. Share common ancestry and similar embryonic origin
2. Perform similar functions but have different evolutionary origins
3. Are vestigial and non-functional in both species
4. Share identical DNA sequences despite living in different habitats

Answer: B — Perform similar functions but have different evolutionary origins

Analogous structures arise by convergent evolution (e.g., wings of birds vs. wings of insects). Homologous structures share common ancestry but may differ in function (e.g., human arm vs. whale flipper).

Q88. Industrial melanism in the peppered moth (Biston betularia) is a classic example of: HPRCA-pat.

1. Mutation pressure
2. Genetic drift
3. Natural selection (directional)
4. Sexual selection

Answer: C — Natural selection (directional)

During the Industrial Revolution, soot darkened trees; dark (carbonaria) moths became better camouflaged against predation, shifting the population toward melanic forms — a textbook example of directional natural selection.

Q89. Which type of speciation occurs when a geographical barrier isolates sub-populations of a species? HPRCA-pat.

1. Sympatric speciation
2. Allopatric speciation
3. Parapatric speciation
4. Peripatric speciation

Answer: B — Allopatric speciation

Allopatric speciation (Greek allos = other, patria = homeland) occurs when a physical barrier (mountain, river, ocean) divides a population; reproductive isolation develops independently in each sub-population until they become separate species.

Q90. The 'molecular clock' concept in evolution uses which type of data? HPRCA-pat.

1. Fossil record dates of first appearance
2. Rate of amino acid or nucleotide substitutions over time
3. Chromosomal band patterns compared across species
4. Geographic distribution of related species

Answer: B — Rate of amino acid or nucleotide substitutions over time

The molecular clock hypothesis (Zuckerkandl & Pauling, 1965) proposes that mutations accumulate at an approximately constant rate; comparing sequence differences between taxa allows estimation of divergence time.

Q91. The constructivist approach to science education holds that learners: HPRCA-pat.

1. Passively receive and store information transmitted by the teacher
2. Actively build new knowledge by connecting it to prior experience and schemas
3. Learn exclusively through rote memorisation and drill
4. Perform best when taught in homogeneous ability groups only

Answer: B — Actively build new knowledge by connecting it to prior experience and schemas

Constructivism (Piaget, Vygotsky) emphasises that learning is an active process; students construct meaning by integrating new information with prior knowledge. The teacher acts as facilitator rather than information transmitter.

Q92. Which of the following is the HIGHEST cognitive level in Bloom's revised taxonomy? HPRCA-pat.

1. Analysing
2. Evaluating
3. Applying
4. Creating

Answer: D — Creating

Bloom's Revised Taxonomy (Anderson & Krathwohl, 2001) levels: Remember, Understand, Apply, Analyse, Evaluate, Create. 'Creating' (synthesis of novel ideas or products) is the apex cognitive level.

Q93. Ausubel's theory of meaningful learning is best characterised by the concept of: HPRCA-pat.

1. Discovery learning through unguided exploration
2. Assimilation of new material into pre-existing cognitive structure (advance organisers)
3. Operant conditioning through positive and negative reinforcement
4. Social learning through observation and imitation

Answer: B — Assimilation of new material into pre-existing cognitive structure (advance organisers)

Ausubel argued that meaningful learning occurs when new concepts are anchored to stable, existing knowledge. 'Advance organisers' — introductory material presented at a higher abstraction level — bridge old and new knowledge.

Q95. The Zone of Proximal Development (ZPD) proposed by Vygotsky is best described as: HPRCA-pat.

1. Tasks a student can complete independently
2. Tasks a student cannot do even with help
3. The gap between what a learner can do independently and what they can do with guidance
4. The range of IQ scores within which normal development occurs

Answer: C — The gap between what a learner can do independently and what they can do with guidance

Vygotsky's ZPD defines the productive learning zone where scaffolding (teacher, peer, tools) elevates performance. Tasks within the ZPD are challenging but achievable with support; this guides instructional design.

Q96. Formative assessment in biology is BEST described as assessment: HPRCA-pat.

1. Conducted at the end of a course to grade students
2. Used during the learning process to monitor progress and provide feedback
3. Administered externally by the board to rank candidates
4. Based only on written examinations

Answer: B — Used during the learning process to monitor progress and provide feedback

Formative ('for learning') assessment is ongoing — quizzes, class questions, lab reports, exit tickets — providing feedback to both teacher and student to adjust instruction. Summative assessment is 'of learning' at course end.

Q97. A biology teacher uses a concept map to help students visualise relationships between photosynthesis, cellular respiration and the carbon cycle. This strategy primarily promotes: HPRCA-pat.

1. Rote memorisation of facts
2. Integration of concepts and meaningful (relational) learning
3. Summative evaluation of prior knowledge
4. Direct instruction via transmission of facts

Answer: B — Integration of concepts and meaningful (relational) learning

Concept maps (Novak, 1984) externalise cognitive schemas, revealing connections between ideas. They align with Ausubel's meaningful learning and help students organise hierarchical scientific concepts.

Q98. Differentiated instruction in a biology classroom means: HPRCA-pat.

1. Teaching the same content in the same way to all students
2. Adapting content, process and product to address diverse learning needs and styles
3. Separating students into gifted and remedial tracks permanently
4. Using only individual projects and avoiding group work

Answer: B — Adapting content, process and product to address diverse learning needs and styles

Differentiated instruction (Tomlinson) modifies what students learn (content), how they learn it (process) and how they demonstrate knowledge (product) to match readiness, interest and learning profiles within the same classroom.

Q100. The term 'pedagogical content knowledge' (PCK) was coined by: HPRCA-pat.

1. Jean Piaget
2. Lee Shulman
3. Jerome Bruner
4. Benjamin Bloom

Answer: B — Lee Shulman

Shulman (1986, 1987) identified PCK as the specific blend of content expertise and pedagogical skill that allows teachers to transform subject matter into teachable forms — a key framework in teacher education.

Q101. According to NCF 2005, science education should emphasise: HPRCA-pat.

1. Learning science as a body of fixed facts for examination
2. Science as inquiry, nurturing curiosity and developing a scientific temper
3. Exclusive use of textbooks, discouraging outside-classroom observations
4. Separation of theory and practical work to reduce confusion

Answer: B — Science as inquiry, nurturing curiosity and developing a scientific temper

NCF 2005 advocates for science education that develops scientific temper (as enshrined in the Indian Constitution), enquiry skills, critical thinking and the ability to connect science with the environment and daily life.

Q102. Which instructional strategy would be MOST effective for teaching the concept of natural selection to secondary students? HPRCA-pat.

1. Lecture with rote notes on Darwin's biography
2. Simulation game where students act as predators selecting coloured prey from backgrounds
3. Showing a documentary without discussion or reflection
4. Dictating definitions and asking students to memorise them

Answer: B — Simulation game where students act as predators selecting coloured prey from backgrounds

Active simulations (e.g., the classic 'bird and worm' camouflage game) make abstract concepts concrete; students experience selective pressure first-hand, building experiential understanding far more effectively than passive methods.

Q103. The Right to Education Act (RTE) 2009 guarantees free and compulsory education to children of which age group? HP-spec.

1. 0–5 years
2. 6–14 years
3. 6–18 years
4. 5–16 years

Answer: B — 6–14 years

The RTE Act 2009 guarantees free and compulsory education for all children aged 6–14 years, implemented under Article 21-A of the Indian Constitution, which was inserted by the 86th Constitutional Amendment.

Q104. Piaget's stage during which children (7–11 years) can perform mental operations on concrete objects but struggle with abstract reasoning is: HPRCA-pat.

1. Sensorimotor stage
2. Preoperational stage
3. Concrete operational stage
4. Formal operational stage

Answer: C — Concrete operational stage

Concrete operational (7–11 years): children understand conservation, serialisation and classification using physical objects but still need concrete referents. Abstract, hypothetical reasoning emerges in the formal operational stage (11+ years).

Q105. Action research in education is distinguished by being: HPRCA-pat.

1. Large-scale, externally funded research to produce generalisable results
2. Systematic, reflective inquiry by practitioners to improve their own practice
3. Exclusively quantitative survey research on student achievement
4. Conducted only by external evaluators, not classroom teachers

Answer: B — Systematic, reflective inquiry by practitioners to improve their own practice

Action research is practitioner-led, context-specific, cyclical (plan–act–observe–reflect) and aimed at immediate improvement of practice. It is an important professional development tool for science teachers.

Q106. ICT integration in biology education is MOST beneficial when it: HPRCA-pat.

1. Replaces all laboratory work and field trips
2. Serves as a substitute for the teacher's subject knowledge
3. Provides visualisation of microscopic processes and simulations of experiments impractical in school labs
4. Limits students to watching lecture recordings

Answer: C — Provides visualisation of microscopic processes and simulations of experiments impractical in school labs

ICT tools such as animations of DNA replication, cell division simulations and virtual dissections let students observe phenomena at scales or costs unavailable in school labs, enriching rather than replacing practical work.

Q107. A student consistently confuses mitosis and meiosis. Which pedagogical strategy is MOST appropriate? HPRCA-pat.

1. Assign more reading from the textbook
2. Use a comparative concept map highlighting key differences with visual models
3. Penalise errors to motivate accuracy
4. Move on to the next topic without remediation

Answer: B — Use a comparative concept map highlighting key differences with visual models

Confusion between related concepts calls for explicit comparative analysis — a concept map or T-chart placing mitosis and meiosis side-by-side on purpose, ploidy, stages and outcome helps students differentiate and retain correct understanding.

Q108. Which national examination body conducts the teacher eligibility test (TET) at the central level in India? HP-spec.

1. NCERT
2. CBSE
3. NUEPA
4. UGC

Answer: B — CBSE

The Central Teacher Eligibility Test (CTET) is conducted by CBSE. State-level TETs (HP-TET, HP-RECA) are conducted by the respective state boards. NCERT develops curricula; NUEPA is a research institution.

Q109. The Snow Leopard (Panthera uncia), HP's state animal, is listed in which IUCN Red List category? HP-spec.

1. Critically Endangered
2. Endangered
3. Vulnerable
4. Near Threatened

Answer: C — Vulnerable

The snow leopard was downlisted from Endangered to Vulnerable (IUCN 2017) as global population estimates improved. It inhabits high-altitude ranges of Spiti, Kinnaur and Lahaul in HP.

Q110. The Great Himalayan National Park (GHNP), a UNESCO World Heritage Site in HP, is situated in which district? HP-spec.

1. Chamba
2. Lahaul and Spiti
3. Kullu
4. Kinnaur

Answer: C — Kullu

GHNP, gazetted 1984 and inscribed UNESCO WHS in 2014, is primarily in Kullu district. It protects the upper catchments of the Jiwa Nal, Sainj and Tirthan rivers and harbours >375 fauna species and >800 plant species.

Q111. Himachal Pradesh was carved out as a separate state on: HP-spec.

1. 15 April 1948
2. 25 January 1971
3. 1 November 1966
4. 26 January 1950

Answer: B — 25 January 1971

HP was made a Union Territory on 15 April 1948 and attained full statehood (18th state) on 25 January 1971 under the HP (Statehood) Act 1970. Dr Y. S. Parmar was its first Chief Minister.

Q112. Which river, originating near Baralacha La pass in Lahaul, is the longest river entirely within Himachal Pradesh? HP-spec.

1. Beas
2. Chenab
3. Ravi
4. Spiti

Answer: B — Chenab

The Chenab (Chandra-Bhaga) originates at Baralacha La; though it crosses into J&K, within HP it has the greatest course length among the major HP rivers. The Beas originates at Beas Kund near Rohtang.

Q113. The Chilgoza pine (Pinus gerardiana), whose edible seeds are commercially harvested, grows naturally in which parts of HP? HP-spec.

1. Lower Siwaliks below 500 m elevation
2. Dry inner valleys of Kinnaur and Spiti (1800–3350 m)
3. Evergreen subtropical forests of Kangra
4. Sub-alpine meadows above 4000 m

Answer: B — Dry inner valleys of Kinnaur and Spiti (1800–3350 m)

Chilgoza pine (Pinus gerardiana) forms open woodlands in the rain-shadow dry inner valleys of Kinnaur, Spiti and parts of Chamba (Pangi); its edible seeds ('chilgoza nuts') are an important forest-based livelihood.

Q114. Himachal Pradesh achieved 100% Open Defecation Free (ODF) status under Swachh Bharat Mission in which year? HP-spec.

1. 2014
2. 2016
3. 2018
4. 2020

Answer: C — 2018

HP was declared 100% ODF in April 2018, among the first hilly states to achieve this, ahead of the national target of October 2019 (SBM rural). The state has also achieved high immunisation and literacy rates.

Q115. The Rohtang Pass connects which two valleys in HP? HP-spec.

1. Kullu Valley and Spiti Valley
2. Kullu Valley and Lahaul Valley
3. Kangra Valley and Chamba Valley
4. Kinnaur Valley and Spiti Valley

Answer: B — Kullu Valley and Lahaul Valley

Rohtang Pass (3,978 m) on the Pir Panjal range links Manali (Kullu valley) with Lahaul valley. The Atal Tunnel (Rohtang Tunnel), opened 2020, provides all-weather connectivity at an altitude of ~3,060 m.

Q116. The Pin Valley National Park, known for its population of Ibex and snow leopard, is in which district? HP-spec.

1. Kinnaur
2. Lahaul and Spiti
3. Kullu
4. Chamba

Answer: B — Lahaul and Spiti

Pin Valley NP (675 km²) is in the cold, arid Spiti district of Lahaul and Spiti. It is a cold-desert ecosystem harbouring Himalayan ibex, snow leopard and Tibetan wolf.

Q117. The HP Board of School Education (HPBOSE) is headquartered at: HP-spec.

1. Shimla
2. Kangra
3. Dharamsala
4. Mandi

Answer: C — Dharamsala

HPBOSE was established in 1969 and is headquartered at Dharamsala (Kangra). It conducts state-level board examinations for classes 8, 10 and 12 and various teacher recruitment tests.

Q118. Kalpa, a major apple-growing town and winter headquarters of Kinnaur district, is situated on the banks of which river? HP-spec.

1. Beas
2. Sutlej
3. Ravi
4. Spiti

Answer: B — Sutlej

Kalpa (Chini) overlooks the Sutlej valley in Kinnaur; the Sutlej (Lanchen Khambab in Tibet) is the easternmost tributary of the Indus entering HP through Shipki La and flowing through Kinnaur.

Q119. The Palampur Declaration on sustainable development was associated with which of the following bodies in HP? HP-spec.

1. HP State Pollution Control Board
2. CSIR–Institute of Himalayan Bioresource Technology (IHBT)
3. HP Legislative Assembly
4. National Medicinal Plants Board, HP chapter

Answer: B — CSIR–Institute of Himalayan Bioresource Technology (IHBT)

CSIR-IHBT at Palampur is India's premier institute for Himalayan bioresources, including medicinal plants, essential oils and phytochemicals. It has pioneered cultivation of high-value herbs in HP's mountain farming systems.

Q120. HP's literacy rate according to Census 2011 was approximately: HP-spec.

1. 64.8%
2. 75.4%
3. 82.8%
4. 89.1%

Answer: C — 82.8%

HP's literacy rate was 82.8% (Census 2011), among the highest in India for hilly states, ahead of the national average of 74.0%. Male literacy was ~89.5% and female literacy ~75.9%.

Q121. Which is the highest peak in Himachal Pradesh? HP-spec.

1. Shilla Peak
2. Deo Tibba
3. Reo Purgyil
4. Hanuman Tibba

Answer: C — Reo Purgyil

Reo Purgyil (6,816 m) on the Indo-Tibet border in Kinnaur is the highest peak in HP. Shilla (6,111 m, Lahaul) was previously claimed highest but satellite surveys confirmed Reo Purgyil's greater elevation.

Q122. The Nati dance, a UNESCO recognised Intangible Cultural Heritage from HP, is most commonly associated with which region? HP-spec.

1. Spiti
2. Kullu-Manali and Shimla hills
3. Lahaul
4. Kinnaur only

Answer: B — Kullu-Manali and Shimla hills

Nati (Naati) is a group folk dance performed in Kullu, Mandi and Shimla regions during festivals. UNESCO inscribed Nati as Intangible Cultural Heritage of Humanity in 2023 as 'Nati — the traditional communal dance of India's Himalayas'.

Q123. The Bhakra-Nangal Dam is built on which river? HP-spec.

1. Beas
2. Ravi
3. Sutlej
4. Yamuna

Answer: C — Sutlej

Bhakra Dam is on the Sutlej River at Bhakra (HP); Nangal Dam is downstream in Punjab. Gobind Sagar reservoir behind Bhakra is the second largest reservoir in India by capacity.

Q124. Which tribal group of HP practices a polyandrous social structure traditionally? HP-spec.

1. Kinnauras of Kinnaur
2. Gaddi shepherds of Chamba
3. Gujjar nomads
4. Pangwali of Pangi

Answer: A — Kinnauras of Kinnaur

The Kinnaura (Kinnara) community of Kinnaur traditionally practiced fraternal polyandry (brothers sharing one wife), similar to the Jaunsar-Bawar community; land scarcity in mountainous terrain is cited as a socio-economic factor.

Q125. The Shimla Agreement (Simla Agreement) of 1972 was signed between India and Pakistan by: HP-spec.

1. Indira Gandhi and Yahya Khan
2. Indira Gandhi and Zulfikar Ali Bhutto
3. Rajiv Gandhi and Benazir Bhutto
4. Jawaharlal Nehru and Liaquat Ali Khan

Answer: B — Indira Gandhi and Zulfikar Ali Bhutto

The Simla Agreement was signed on 2 July 1972 between PM Indira Gandhi and Pakistan's President Z. A. Bhutto at the HP State Guesthouse (Barnes Court) in Shimla, following India's victory in the 1971 Bangladesh Liberation War.

Q126. The Triund trekking meadow, overlooking Dharamsala, lies in which mountain range? HP-spec.

1. Zanskar Range
2. Dhauladhar Range
3. Pir Panjal Range
4. Great Himalayan Range

Answer: B — Dhauladhar Range

Triund (2,850 m) sits on the Dhauladhar range above McLeod Ganj (Dharamsala), Kangra. The Dhauladhar ('White Range') forms the southern boundary of the Chamba valley and is prominent in the western Himachal landscape.

Q127. HP's apple production accounts for approximately what percentage of India's total apple output? HP-spec.

1. 10–15%
2. 25–30%
3. 50–60%
4. 70–80%

Answer: D — 70–80%

HP produces roughly 70–80% of India's total apple crop; Kullu, Shimla and Kinnaur are the main belts. The apple economy contributes significantly to rural household income in the mid-Himalayan zone (1500–2500 m).

Q128. Tabo Monastery in Spiti, one of the oldest functioning Buddhist monasteries in India, was founded in: HP-spec.

1. 700 CE
2. 996 CE
3. 1200 CE
4. 1458 CE

Answer: B — 996 CE

Tabo Chos-Khor Monastery was founded in 996 CE by Rinchen Zangpo, a Tibetan Buddhist translator. Its 9th-century murals and clay sculptures are among the finest in the Himalayan Buddhist tradition.

Q129. The Kugti Wildlife Sanctuary, important for western tragopan (Tragopan melanocephalus) — HP's state bird — is in which district? HP-spec.

1. Mandi
2. Kullu
3. Chamba
4. Lahaul and Spiti

Answer: C — Chamba

Kugti WLS (379 km²) is in Chamba district. The western tragopan (Jujurana) is found in dense Himalayan oak-rhododendron forests; HP and Himachal forests hold the major global population of this IUCN-Vulnerable pheasant.

Q130. Himachal Pradesh's Spiti Valley receives very low annual rainfall (<200 mm) because it: HP-spec.

1. Lies at very high altitude above the monsoon belt
2. Lies in the rain shadow east of the Himalayan main ranges, shielded from the monsoon
3. Has cold temperatures that suppress precipitation
4. Is surrounded by glaciers that absorb moisture

Answer: B — Lies in the rain shadow east of the Himalayan main ranges, shielded from the monsoon

The Himalayan wall intercepts southwest monsoon moisture; by the time air masses cross the Great Himalayan and Zanskar ranges, they are depleted, leaving Spiti and Lahaul in a rain shadow — a cold desert with semi-arid conditions.

Q131. The 2030 Agenda for Sustainable Development has how many Sustainable Development Goals (SDGs)? HPRCA-pat.

1. 8
2. 15
3. 17
4. 21

Answer: C — 17

The United Nations adopted 17 SDGs and 169 targets in September 2015, replacing the 8 Millennium Development Goals (MDGs 2000–2015). SDG 3 (Good Health & Well-being) and SDG 4 (Quality Education) are directly relevant to biology teachers.

Q132. The Paris Agreement (2015) aims to limit global average temperature rise to well below: HPRCA-pat.

1. 1.0 °C above pre-industrial levels
2. 1.5–2.0 °C above pre-industrial levels
3. 2.5 °C above pre-industrial levels
4. 3.0 °C above pre-industrial levels

Answer: B — 1.5–2.0 °C above pre-industrial levels

The Paris Agreement (COP 21, December 2015) commits nations to holding warming 'well below 2 °C' and pursuing efforts to limit to 1.5 °C above pre-industrial temperatures to reduce climate-change risks.

Q133. Which Indian space mission successfully soft-landed on the Moon's south polar region in August 2023? HPRCA-pat.

1. Chandrayaan-1
2. Chandrayaan-2
3. Chandrayaan-3
4. Aditya-L1

Answer: C — Chandrayaan-3

ISRO's Chandrayaan-3 Vikram lander successfully soft-landed near the Moon's south pole on 23 August 2023, making India the first country to achieve a soft landing near the lunar south pole and the fourth nation to land on the Moon.

Q134. The National Education Policy (NEP) 2020 recommends what school structure replacing the earlier 10+2 system? HPRCA-pat.

1. 6+3+3+2
2. 5+3+3+4
3. 4+4+4+2
4. 8+4

Answer: B — 5+3+3+4

NEP 2020 proposes a 5+3+3+4 structure: Foundational (3–8 yrs, 5 years), Preparatory (8–11 yrs, 3 years), Middle (11–14 yrs, 3 years) and Secondary (14–18 yrs, 4 years), replacing the 10+2 format for holistic learning.

Q135. G20 India Presidency (2023) adopted which theme? HPRCA-pat.

1. 'Building Back Better'
2. 'Vasudhaiva Kutumbakam — One Earth, One Family, One Future'
3. 'People, Planet, Prosperity'
4. 'Transforming Our World'

Answer: B — 'Vasudhaiva Kutumbakam — One Earth, One Family, One Future'

India's G20 presidency (December 2022–November 2023) used the Sanskrit phrase Vasudhaiva Kutumbakam (the world is one family, Maha Upanishad) as its central theme, hosting the New Delhi Summit in September 2023.

Q136. Who won the Nobel Prize in Physiology or Medicine 2023 for discoveries on mRNA vaccines? HPRCA-pat.

1. Jennifer Doudna and Emmanuelle Charpentier
2. Katalin Karikó and Drew Weissman
3. Svante Pääbo and David Julius
4. Jeffrey Hall and Michael Rosbash

Answer: B — Katalin Karikó and Drew Weissman

Karikó and Weissman (2023 Nobel Physiology/Medicine) discovered that modifying nucleosides in mRNA enables effective mRNA-based vaccines without triggering the innate immune inflammatory response — the basis of the COVID-19 mRNA vaccines.

Q137. The 'One Health' concept recognises that: HPRCA-pat.

1. Only human medicine should guide public health policy
2. Human, animal and ecosystem health are interdependent and inseparable
3. Veterinary and environmental sciences are separate from public health
4. Wild animals pose no risk to human health if separated geographically

Answer: B — Human, animal and ecosystem health are interdependent and inseparable

'One Health' (WHO/FAO/OIE) framework recognises ~75% of emerging infectious diseases are zoonotic, and that environmental degradation drives spillover. Effective response requires collaboration between medicine, veterinary and ecological disciplines.

Q138. Operation Kaveri (2023) was conducted by India to evacuate its citizens from: HPRCA-pat.

1. Ukraine
2. Afghanistan
3. Sudan
4. Yemen

Answer: C — Sudan

Operation Kaveri (April–May 2023) evacuated over 3,800 Indian nationals and some other citizens from Sudan amid armed conflict between SAF and RSF. The IAF and Indian Navy coordinated the evacuation via Port Sudan and Saudi Arabia.

Q139. A student notices that a red-coloured object appears black under blue light. This is best explained by: HPRCA-pat.

1. The object emits red light
2. The object reflects only red wavelengths; blue light has no red to reflect
3. Blue light has higher energy and destroys the red pigment
4. The human eye cannot detect blue light

Answer: B — The object reflects only red wavelengths; blue light has no red to reflect

Colour perception depends on reflected light. A red surface reflects red wavelengths (~620–750 nm) and absorbs others. Under blue light (~450–490 nm), there is no red wavelength to reflect, so the surface appears dark/black.

Q140. Which of the following is a renewable source of energy? HPRCA-pat.

1. Coal
2. Natural gas
3. Nuclear fission fuel (uranium)
4. Solar photovoltaic energy

Answer: D — Solar photovoltaic energy

Solar, wind, hydropower and biomass are renewable as they draw on continuously replenished natural flows. Coal, natural gas and uranium are finite, non-renewable resources formed over geological timescales.

Q141. Article 51A(h) of the Indian Constitution relates to: HPRCA-pat.

1. Right to education as a fundamental right
2. Duty to develop scientific temper, humanism and spirit of enquiry
3. Right to freedom of speech and expression
4. Directive principle for free legal aid

Answer: B — Duty to develop scientific temper, humanism and spirit of enquiry

Article 51A(h) lists as a Fundamental Duty of every citizen 'to develop the scientific temper, humanism and the spirit of inquiry and reform' — directly relevant to the purpose of science education.

Q142. In a series circuit, three resistors of 2Ω, 3Ω and 5Ω are connected. What is the total resistance? HPRCA-pat.

1. 1.0 Ω
2. 3.33 Ω
3. 10 Ω
4. 30 Ω

Answer: C — 10 Ω

In a series circuit, total resistance R_T = R₁ + R₂ + R₃ = 2 + 3 + 5 = 10 Ω. In a parallel circuit, the reciprocal rule applies: 1/R_T = 1/2 + 1/3 + 1/5.

Q143. Panchayati Raj in India was constitutionally established by which amendment? HPRCA-pat.

1. 42nd Amendment, 1976
2. 73rd Amendment, 1992
3. 86th Amendment, 2002
4. 91st Amendment, 2003

Answer: B — 73rd Amendment, 1992

The 73rd Constitutional Amendment Act (1992) gave constitutional status to Panchayati Raj institutions, mandating three-tier gram panchayat–panchayat samiti–zila parishad structure, reservations and elections every 5 years.

Q144. The Indian monsoon is primarily driven by: HPRCA-pat.

1. Differential heating of land and sea creating pressure gradients
2. Rotation of the Earth (Coriolis force) alone
3. Jet stream patterns over central Asia only
4. Oceanic thermohaline circulation

Answer: A — Differential heating of land and sea creating pressure gradients

The South Asian monsoon results primarily from differential heating: the Indian subcontinent heats faster than the Indian Ocean in summer, creating a low-pressure zone over land that draws moist marine air onshore (SW monsoon June–September).

Q145. Statement 1: India has the largest road network in the world.
Statement 2: The National Highway Authority of India (NHAI) manages all national and state highways.
Choose the correct option: HPRCA-pat.

1. Both statements are correct
2. Statement 1 is correct; Statement 2 is incorrect
3. Statement 1 is incorrect; Statement 2 is correct
4. Both statements are incorrect

Answer: B — Statement 1 is correct; Statement 2 is incorrect

India has the second-largest road network globally (after the USA), making Statement 1 borderline; however NHAI manages national highways specifically, not state highways — state highways are under state PWDs. Statement 2 is incorrect.

Q146. Identify the correctly punctuated sentence: HPRCA-pat.

1. The teacher said, "Students, please read chapter four before Tuesday."
2. The teacher said "Students please read chapter four before Tuesday."
3. The teacher said, Students please read chapter four before Tuesday.
4. The teacher said "Students, please read chapter four, before Tuesday".

Answer: A — The teacher said, "Students, please read chapter four before Tuesday."

Direct speech requires a comma after the reporting verb, opening and closing quotation marks enclosing the spoken words, and the full stop inside the closing quotation mark. Option A fulfils all three requirements correctly.

Q147. Choose the word CLOSEST in meaning to 'perspicacious': HPRCA-pat.

1. Lethargic
2. Perspiring
3. Shrewd and discerning
4. Verbose and repetitive

Answer: C — Shrewd and discerning

'Perspicacious' (from Latin perspicere = to see clearly) means having a ready insight into things; sharp, astute, shrewd. It is frequently confused with 'perspicuous' (clearly expressed) — a common vocabulary test pair.

Q148. ‘बानाणात क्डा माना है?’ में रेखांकित मुहावरे का ऴीक अर्थ चुनें: ('Banana kha' mein muhaavare ka theek arth) HPRCA-pat.

1. Bribery accepted
2. To get into trouble / be deceived
3. To celebrate a victory
4. To earn money easily

Answer: B — To get into trouble / be deceived

The Hindi idiomatic phrase 'dhoka khana' / colloquially 'banaa kha jaana' means to be tricked or fall into a trap. In teachers' recruitment Hindi papers, idiomatic meaning (muhaavara arth) questions test contextual language comprehension.

Q149. In English grammar, which sentence demonstrates correct subject-verb agreement? HPRCA-pat.

1. The committee have decided unanimously to approve the proposal.
2. Neither the teacher nor the students was present.
3. Each of the boys is responsible for their own work.
4. A number of experiments was conducted in the laboratory.

Answer: C — Each of the boys is responsible for their own work.

'Each' is a singular indefinite pronoun, requiring a singular verb ('is'). Option A: 'committee' is collective, singular in formal British English ('has decided'). Option B: 'neither…nor' uses verb matching the nearer subject ('students were'). Option D: 'a number of' takes plural verb ('were conducted').

Q150. The antonym of 'euphemism' is: HPRCA-pat.

1. Dysphemism
2. Euphony
3. Cacophony
4. Paradox

Answer: A — Dysphemism

A euphemism substitutes a mild/indirect expression for one considered harsh or blunt ('passed away' for 'died'). Its antonym, dysphemism, is the deliberate use of a harsher or more direct expression where a polite alternative exists.