Q10. Which of the following would help in prevention of diuresis?
Correct Answer: (c)
Aldosterone stimulates reabsorption of Na+ and water from the renal tubules, preventing diuresis (excessive urine loss).
Q11. Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G₀). This process occurs at the end of :
Correct Answer: (c)
Cells exit the G1 phase to enter the quiescent stage (G0).
Q12. Match the following columns and select the correct option.
Column -I
Column - II
(a) Organ of Corti
(i) Connects middle ear and pharynx
(b) Cochlea
(ii) Coiled part of the labyrinth
(c) Eustachian tube
(iii) Attached to the oval window
(d) Stapes
(iv) Located on the basilar membrane
Correct Answer: (d)
Organ of Corti-Basilar membrane(iv), Cochlea-Coiled part(ii), Eustachian tube-Connects middle ear(i), Stapes-Oval window(iii).
Q13. The QRS complex in a standard ECG represents:
Correct Answer: (d)
The QRS complex represents the depolarisation of the ventricles, which initiates ventricular contraction.
Q14. Strobili or cones are found in :
Correct Answer: (a)
Equisetum (Horsetails) possess distinct strobili or cones.
Q15. Cuboidal epithelium with brush border of microvilli is found in :
Correct Answer: (d)
PCT of nephron is lined by simple cuboidal brush border epithelium to increase surface area for reabsorption.
Q16. Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ?
Correct Answer: (d)
Golgi bodies are the site of glycosylation, forming glycoproteins and glycolipids.
Q17. Select the correct match.
Correct Answer: (d)
Sickle cell anaemia is an autosomal recessive disorder caused by a mutation on chromosome 11.
Q18. Dissolution of the synaptonemal complex occurs during :
Correct Answer: (d)
The synaptonemal complex dissolves during the Diplotene stage.
Q19. How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
Correct Answer: (d)
Mendel selected 14 true-breeding pea plant varieties (7 pairs of contrasting traits).
Q20. Which of the following is correct about viroids ?
Correct Answer: (c)
Viroids are smaller than viruses and consist of free RNA without a protein coat.
Q21. The first phase of translation is :
Correct Answer: (d)
The first phase is the charging of tRNA (Aminoacylation).
Q22. Identify the wrong statement with reference to immunity.
Correct Answer: (d)
Active immunity is slow and takes time to give its full effective response.
Q23. The roots that originate from the base of the stem are :
Correct Answer: (b)
Fibrous roots originate from the base of the stem (e.g., in monocots).
Q24. The infectious stage of Plasmodium that enters the human body is :
Correct Answer: (c)
Sporozoites are the infectious form injected by the mosquito bite.
Q25. Which of the following is not an inhibitory substance governing seed dormancy?
Correct Answer: (b)
Gibberellic acid breaks seed dormancy; it is a promoter, not an inhibitor.
Q26. In water hyacinth and water lily, pollination takes place by :
Correct Answer: (b)
In aquatic plants like water hyacinth and water lily, flowers emerge above the level of water and are pollinated by insects or wind.
Q27. In gel electrophoresis, separated DNA fragments can be visualized with the help of :
Correct Answer: (c)
DNA fragments are stained with Ethidium bromide and visualized under UV light.
Q28. Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their :
Correct Answer: (d)
Many secondary metabolites serve as defence mechanisms against grazers and browsers.
Q29. Which of the following statements about inclusion bodies is incorrect ?
Correct Answer: (c)
Inclusion bodies are for storage (reserve material), not for ingestion of food particles.
Q30. The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are :
Correct Answer: (a)
Nitrogenase catalyzes the reduction of nitrogen to ammonia, releasing hydrogen as a by-product (N₂ + 8H⁺ + 8e⁻ → 2NH₃ + H₂).
Q31. The specific palindromic sequence which is recognized by EcoRI is :
Correct Answer: (b)
EcoRI recognizes the palindromic sequence 5'-GAATTC-3'.
Q32. Which of the following statements are true for the phylum-Chordata ? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata. Choose the correct answer from the options given below:
Correct Answer: (a)
Statement (b) and (c) are true. (a) is false (Urochordata notochord is in tail only). (d) is false (Hemichordata is a separate phylum).
Q33. Identify the substances having glycosidic bond and peptide bond, respectively in their structure :
Correct Answer: (a)
Inulin is a polysaccharide (glycosidic bond), and Insulin is a protein (peptide bond).
Q34. Select the option including all sexually transmitted diseases.
Correct Answer: (b)
Gonorrhoea, Syphilis, and Genital herpes are all STDs. Cancer and Malaria are not.
Q35. The body of the ovule is fused within the funicle at:
Correct Answer: (b)
The point of attachment of the body of the ovule to the funicle is called Hilum.
Q36. Meiotic division of the secondary oocyte is completed :
Correct Answer: (a)
The secondary oocyte completes Meiosis II only upon entry of the sperm, before nuclei fusion.
Q37. Which of the following statements is not correct?
Correct Answer: (d)
Functional insulin has A and B chains linked together by **disulphide bonds**, not hydrogen bonds.
Q38. Match the following columns and select the correct option.
Column-I
Column-II
(a) Gregarious, polyphagous pest
(i) Asterias
(b) Adult with radial symmetry and larva with bilateral symmetry
Q39. Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?
Correct Answer: (b)
High concentration of Estrogen triggers the LH surge, which causes ovulation.
Q40. Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to :
Correct Answer: (b)
Bt cotton is resistant to insect pests (specifically bollworms).
Q41. If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10⁹ bp, then the length of the DNA is approximately :
Correct Answer: (d)
Length = 6.6 x 10^9 x 0.34 x 10^-9 meters ≈ 2.2 meters.
Q42. The transverse section of a plant shows following anatomical features: (a) Large number of scattered vascular bundles surrounded by bundle sheath. (b) Large conspicuous parenchymatous ground tissue. (c) Vascular bundles conjoint and closed. (d) Phloem parenchyma absent. Identify the category of plant and its part :-
Correct Answer: (b)
Conjoint, closed, scattered vascular bundles and absence of phloem parenchyma are characteristic features of a Monocotyledonous stem.
Q43. Match the following columns and select the correct option.
Q48. From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask :
Correct Answer: (b)
Miller used Methane (CH4), Hydrogen (H2), Ammonia (NH3) and water vapor at 800°C.
Q49. In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
Correct Answer: (b)
Embryo Transfer includes ZIFT (Zygote Intra Fallopian Transfer) and IUT (Intra Uterine Transfer).
Q50. The plant parts which consist of two generations one within the other : (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule
Correct Answer: (a)
Pollen (gametophyte) in anther (sporophyte) and Embryo sac (gametophyte) in ovule (sporophyte) represent one generation inside another.
Q51. Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.
Correct Answer: (d)
When IA and IB are present, they express **different** sugars (Co-dominance), not the same type.
Q52. Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action? (a) Darwin's Finches of Galapagos islands. (b) Herbicide resistant weeds. (c) Drug resistant eukaryotes. (d) Man-created breeds of domesticated animals like dogs.
Correct Answer: (d)
(b), (c), and (d) are examples of evolution driven by human actions (anthropogenic).
Q53. Identify the wrong statement with regard to Restriction Enzymes.
Correct Answer: (a)
While statement (1) is biologically true (Ligases join ends), in the context of 'Restriction Enzymes' features, this is a function of Ligase, not Restriction enzyme. (Official keys often mark this because it describes Ligase, or sometimes the question implies 'Which is not a property of RE?').
Q54. Goblet cells of alimentary canal are modified from :
Correct Answer: (c)
Goblet cells are modified columnar epithelial cells that secrete mucus.
Q55. Floridean starch has structure similar to:
Correct Answer: (c)
Floridean starch (in Red Algae) is structurally very similar to amylopectin and glycogen.
Q56. Name the enzyme that facilitates opening of DNA helix during transcription.
Correct Answer: (a)
During transcription, RNA polymerase binds to the promoter and initiates unwinding (opening) of the DNA helix.
Q57. Which of the following statements is correct ?
Correct Answer: (a)
Adenine pairs with Thymine via 2 Hydrogen bonds. Guanine pairs with Cytosine via 3.
Q58. Embryological support for evolution was disapproved by :
Correct Answer: (b)
Karl Ernst von Baer disapproved the embryological support for evolution proposed by Ernst Haeckel, noting that embryos never pass through the adult stages of other animals.
Q59. The process of growth is maximum during :
Correct Answer: (b)
Growth is exponential and maximum during the Log (exponential) phase.
Q60. Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases
Correct Answer: (b)
Inspiration involves contraction of diaphragm and external intercostal muscles, increasing pulmonary volume and decreasing pressure.
Q61. Match the following columns and select the correct option.