WBSSC 2nd SLST Question Paper – 2025
1. A hormone produced by kidney—
(A) Gastrin
(B) Aldosterone
(C) Erythropoietin
(D) ADH
2. The enzyme involved in digestion of carbohydrate inside the alimentary tract is
(A) Nucleotidase
(B) Carboxypeptidase
(C) Amylase
(D) Gelatinase
3. Neural cell responsible for myelin formation in peripheral nervous system—
(A) Schwann cell
(B) Astrocyte
(C) Oligodendroglia
(D) Pyramidal cell
4. A synthetic plant hormone used as herbicide is
(A) IAA
(B) GA₃
(C) 2, 4-D
(D) Kinetin
5. Serum agglutinin present in a person having blood group B—
(A) Only alpha (α)
(B) Only beta (β)
(C) Both alpha (α) and beta (β)
(D) No agglutinin present
6. What is the main role of nucleolus?
(A) DNA replication
(B) Ribosome synthesis
(C) Protein packaging
(D) Cell division
7. The shape of O₂-dissociation curve of haemoglobin—
(A) Oval
(B) Sigmoid
(C) Circular
(D) Hyperbolic
8. Which of the following is not a part of sarcotubular system of muscle?
(A) Sarcoplasmic reticulum
(B) T-tubules
(C) Terminal cisternae
(D) Epimysium
9. Betz cell is found in—
(A) Pons
(B) Thalamus
(C) Cerebellum
(D) Cerebrum
10. When single placenta develops along the junction of two fused margins of a monocarpellary single-chambered ovary, it is called
(A) Marginal placentation
(B) Parietal placentation
(C) Axile placentation
(D) Basal placentation
11. The phenotypic ratio of F₂-generation obtained according to Mendel’s dihybrid cross and law of independent assortment is
(A) 9 : 5 : 1 : 1
(B) 9 : 3 : 3 : 1
(C) 9 : 5 : 5 : 2
(D) 9 : 3 : 5 : 2
12. Factor that does not influence enzyme activity—
(A) Substrate concentration
(B) Product concentration
(C) pH of the medium
(D) Osmolarity of the medium
13. Which one of the following is an example of in-situ conservation of biological resource?
(A) Botanical garden
(B) Zoo
(C) Breeding center
(D) National park
14. Bombay duck and Hilsha are example of
(A) fresh water fish
(B) marine fish
(C) breeds of suck
(D) breeds of sheep
15. Which of the following dye-yielding plants belongs to Fabaceae family?
(A) Crocus sativus
(B) Indigofera tinctoria
(C) Lawsonia inermis
(D) Rubia tinctorium
16. Microfibrils are comprised of
(A) (1→3) β-D Glucan chain
(B) (1→4) β-D Glucan chain
(C) α-L Arabinose
(D) β-D Galactose
17. Bast fibres are components of
(A) Xylem tissue
(B) Meristematic tissue
(C) Phloem tissue
(D) Secretory tissue
18. Loss of accommodation power with ageing is called
(A) Astigmatism
(B) Presbyopia
(C) Cataract
(D) Myopia
19. Which plant group commonly shows CAM photosynthesis?
(A) Hydrophytes
(B) Epiphytes
(C) Xerophytes
(D) Halophytes
20. Biodiversity loss occurs due to the reason given below:
(A) Habitat loss and fragmentation
(B) Over exploitation
(C) Co-extinction
(D) Allien species invasion
21. Which group does not contain polyp stage?
(A) Anthozoa
(B) Hydrozoa
(C) Schyphozoa
(D) Calcarea
22. Example of an inorganic fungicide is
(A) Ziram (Zerlate)
(B) Bordeaux mixture
(C) Zineb (Dithane Z-78)
(D) ferbam (Fermate)
23. The camel’s hump is composed of a tissue that provides water when oxidised. Mention its source—
(A) Skeletal
(B) Areolar
(C) Muscular
(D) Adipose
24. Respiratory Quotient (R.Q.) of mixed diet—
(A) 0.85
(B) 0.70
(C) 1.00
(D) 0.95
25. Phylum ‘Porifera‘ is classified based on—
(A) Branching
(B) Symmetry
(C) Spicules
(D) Reproduction
26. Flame cell is found in
(A) Annelida
(B) Chordata
(C) Porifera
(D) Platyhelminthes
27. Air bladder is present in
(A) Scoliodon sp.
(B) Exocoetus sp.
(C) Trygon sp.
(D) Pristis sp.
28. The micro-organism which mediates denitrification is
(A) Nitrosomonas
(B) Azotobacter
(C) Thiobacillus
(D) Rhizobium
29. A process ensuring self-pollination is
(A) Dichogamy
(B) Self-sterility
(C) Cleistogamy
(D) Herkogamy
30. The group of plants where viviparous germination is found.
(A) Halophytes
(B) Xerophytes
(C) Epiphytes
(D) Hydrophytes
31. Taq Polymerase enzyme is used in PCR is isolated from
(A) Thermus aquaticus
(B) Salmonella typhimurium
(C) Escherechia coli
(D) Vibrio cholarae
32. Inheritance of colour blindness is due to
(A) X-linked gene
(B) X-Y linked gene
(C) Y linked gene
(D) Autosomal gene
33. Volume of air that can be inspired by maximum effort above the tidal volume is called
(A) Expiratory Reserve Volume (ERV)
(B) Inspiratory Reserve Volume (IRV)
(C) Functional Residual Capacity (FRC)
(D) Residual Volume (RV)
34. In Bryophytes, number of flagella present in each antherozoid is
(A) 1
(B) 4
(C) Many
(D) 2
35. Choanocyte cells are also called as
(A) Flagellated cell
(B) Collar cell
(C) Amoeboid cell
(D) Epidermal cell
36. The study of fish culture is called
(A) Ophiology
(B) Ichthyology
(C) Herpetology
(D) Pisciculture
37. Hormone secreted from corpus luteum—
(A) Estrogen
(B) Progesterone
(C) Oxytocin
(D) HCG
38. Which of the following enzymes catalyzes the FADH₂-producing reaction of Kreb’s cycle?
(A) α-ketoglutarate dehydrogenase
(B) Succinate dehydrogenase
(C) Malate dehydrogenase
(D) Isocitrate dehydrogenase
39. Phylogenetic classification is based on
(A) Morphology
(B) Evolutionary history
(C) Reproductive features
(D) Seed structure
40. The disease caused by hypoactivity of thyroid gland in children—
(A) Myxoedema
(B) Goitre
(C) Cretinism
(D) Acromegaly
41. Megaloblastic anaemia is caused by the deficiency of which vitamin:
(A) Pyridoxine
(B) Riboflavin
(C) Thiamine
(D) Cyanocobalamin
42. Which microbe converts ammonia to nitrite?
(A) Nitrobacter
(B) Nitrosomonas
(C) Thiobacillus
(D) Micrococcus
43. Excess consumption of which of the following vitamins causes hypervitaminosis?
(A) Vitamin-C
(B) Vitamin-A
(C) Vitamin-B₁
(D) Vitamin-B₁₂
44. One-seeded caryopsis type of fruit is found in
(A) Fabaceae
(B) Poaceae
(C) Solanaceae
(D) Rubiaceae
45. Kupffer cell is found in
(A) Pancreas
(B) Liver
(C) Parotid gland
(D) Large intestine
46. What will happen if RBC is immersed in 0.9% NaCl solution?
(A) RBC will swell
(B) RBC will shrink
(C) No charge in shape of RBC
(D) Haemolysis will occur
47. Which of the following organisms breath from skin?
(A) Snake
(B) Earthworm
(C) Monkey
(D) Human
48. The Bachmann’s bundle carries cardiac impulse from
(A) Bundle of His to Purkinje fibre
(B) AV node to Bundle of His
(C) Purkinje fibre to papillary muscle
(D) SA node to AV node
49. Which of the following statement is true for smooth muscle?
(A) It is a voluntary muscle
(B) It can contract in response to motor nerve stimulation
(C) It is a striated muscle
(D) It is controlled by autonomic nervous system
50. Signet ring stage is found in
(A) Plasmodium vivax
(B) Giardia intestinalis
(C) Leishmania donovani
(D) Trypanosoma gambiensi
51. ‘Portuguese man of war’ is
(A) Hydra sp.
(B) Physalia sp.
(C) Obelia sp.
(D) Paramoecium sp.
52. Mass meristem, plate meristem and rib meristem are types of meristematic tissue, which are classified on the basis of
(A) Plane of division
(B) Origin
(C) Function
(D) Position in the plant body
53. Octopus is a
(A) Squid
(B) Devil fish
(C) Locust
(D) Tusk shell
54. The part of the brain in which ‘feeding centre’ is located—
(A) Thalamus
(B) Hypothalamus
(C) Basal ganglia
(D) Amygdala
55. ‘Aristattle lantern’ is found in
(A) Echinodermata
(B) Chordata
(C) Mollusca
(D) Annelida
56. Reproduction in larval stage is called
(A) Paedogenesis
(B) Neoteny
(C) Parthenogenesis
(D) Parthenocarpy
57. Genes located on ‘Y’ chromosome is called
(A) Mutant gene
(B) Sex linked gene
(C) Autosomal gene
(D) Holandric gene
58. Amber is
(A) Fossilized lignin
(B) Fossilized suberin
(C) Fossilized cutin
(D) Fossilized resin
59. Humoral immunity system is mediated by
(A) T-cell
(B) B cell
(C) NK cell
(D) Plasma cell
60. The endosperm in Gymnosperm is
(A) 2n
(B) 3n
(C) n
(D) 4n