Kelvi

Biology questions for 2024

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1. In the given figure, which component has thin outer walls and highly thickened inner walls?

2. List of endangered species was released by-

3. The type of conservation in which the threatened species are taken out from their natural habitat and placed in special setting where they can be protected and given special care is called;

Which one of the following can be explained on the basis of Mendel’s Law of Dominance? $\newline$ A. Out of one pair of factors one is dominant and the other is recessive. $\newline$ B. Alleles do not show any expression and both the characters appear as such in F_2 generation. $\newline$ C. Factors occur in pairs in normal diploid plants. $\newline$ D. The discrete unit controlling a particular character is called factor. $\newline$ E. The expression of only one of the parental characters is found in a monohybrid cross.

5. The lactose present in the growth medium of bacteria is transported to the cell by the action of:

6. Match List I with List II

The equation of Verhulst-Pearl logistic growth is $\frac{dN}{dt} = rN [\frac{K - N}{K}]$

8. A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and downstream end;

9. Formation of interfascicular cambium from fully developed parenchyma cells is an example for

10. Match List I with List II

11.

What is the fate of a piece of DNA carrying only gene of interest which is transferred into an alien organism? $\newline$ A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism. $\newline$ B. It may get integrated into the genome of the recipient. $\newline$ C. It may multiply and be inherited along with the host DNA. $\newline$ D. The alien piece of DNA is not an integral part of chromosome. $\newline$ E. It shows ability to replicate.

12. Match List I with List II

13. Identify the type of flowers based on the position of calyx, corolla, and androecium with respect to the ovary from the given figures (a) and (b)

14. Spindle fibers attach to kinetochores of chromosomes during

15.

These are regarded as major causes of biodiversity loss: $\newline$ A. Over exploitation $\newline$ B. Co-extinction $\newline$ C. Mutation $\newline$ D. Habitat loss and fragmentation $\newline$ E. Migration

16. Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

17.

Identify the set of correct statements: $\newline$ A. The flowers of Vallisneria are colourful and produce nectar. $\newline$ B. The flowers of water lily are not pollinated by water. $\newline$ C. In most of water-pollinated species, the pollen grains are protected from wetting. $\newline$ D. Pollen grains of some hydrophytes are long and ribbon-like. $\newline$ E. In some hydrophytes, the pollen grains are carried passively inside water.

18. The cofactor of the enzyme carboxypeptidase is:

19. Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of:

20. Which of the following is an example of actinomorphic flower?

21.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Chromosomes become gradually visible under light microscope during leptotene stage. $\newline$ $\newline$ Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex. $\newline$ $\newline$

22. A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

23.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Parenchyma is living but collenchyma is dead tissue. $\newline$ $\newline$ Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms. $\newline$ $\newline$

24.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Bt toxins are insect group specific and coded by a gene cry IAc. $\newline$ $\newline$ Statement II: Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. $\newline$

25. Which one of the following is not a criterion for classification of fungi?

26. The capacity to generate a whole plant from any cell of the plant is called:

27.

Which of the following are required for the dark reaction of photosynthesis? $\newline$ A. Light $\newline$ B. Chlorophyll $\newline$ C. CO₂ $\newline$ D. ATP $\newline$ E. NADPH

28.

Tropical regions show greatest level of species richness because: $\newline$ A. Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification. $\newline$ B. Tropical environments are more seasonal. $\newline$ C. More solar energy is available in tropics. $\newline$ D. Constant environments promote niche specialization. $\newline$ E. Tropical environments are constant and predictable.

29. Identify the part of the seed from the given figure which is destined to form root when the seed germinates.

30. How many molecules of ATP and NADPH are required for every molecule of CO₂ fixed in the Calvin cycle?

31. In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

32. Hind II always cuts DNA molecules at a particular point called recognition sequence and it consists of:

33. Bulliform cells are responsible for:

34. Match List I with List II

35. Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:

36. Match List I with List II

37. The DNA present in chloroplast is:

38. Identify the correct description about the given figure:

39. Match List I with List II

40.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: In C₃ plants, some O₂ binds to RuBisCO, hence CO₂ fixation is decreased. $\newline$ $\newline$ Statement II: In C₄ plants, mesophyll cells show very little photosynthesis while bundle sheath cells do not show photorespiration. $\newline$ $\newline$

41. Identify the step in the tricarboxylic acid cycle, which does not involve oxidation of substrate.

42. Match List I with List II

43. Which of the following are fused in somatic hybridization involving two varieties of plants?

44. Match List I with List II

45. Match List I with List II

46.

$\newline$ Read the following statements and choose the set of correct statements: $\newline$ In the members of Phaeophyceae $\newline$ A. asexual reproduction occurs usually by biflagellate zoospores. $\newline$ $\newline$ B. Sexual reproduction is by oogamous method only. $\newline$ $\newline$

47. Match List I with List II

48. Which of the following statement is correct regarding the process of replication in E. coli?

49. Spraying sugarcane crop with which of the following plant growth regulators increases the length of stem, thus, increasing the yield?

50.

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $\newline 100x \ (kcal m^{-2}) yr^{-1} \newline$ what would be the Gross Primary Productivity (GPP) of the third trophic level of the same ecosystem?

51. Match List I with List II:

52. Match List I with List II:

53. Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

54. Match List I with List II:

55. Match List I with List II:

56.

Which of the following are Autoimmune disorders? $\newline$ A. Myasthenia gravis $\newline$ B. Rheumatoid arthritis $\newline$ C. Gout $\newline$ D. Muscular dystrophy $\newline$ E. Systemic Lupus Erythematosus (SLE)

57.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: In the nephron, the descending limb of the loop of Henle is impermeable to water and permeable to electrolytes. $\newline$ $\newline$ Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for absorption. $\newline$ $\newline$

58. Which of the following is not a steroid hormone?

59.

$\newline$ Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. $\newline$ $\newline$ Assertion A: FSH acts upon ovarian follicles in females and Leydig cells in males. $\newline$ $\newline$ Reason R: Growing ovarian follicles secrete estrogen in females while interstitial cells secrete androgen in male human beings. $\newline$

60.

Given below are some stages of human evolution. Arrange them in correct sequence (Past to Recent). $\newline$ A. Homo Habilis $\newline$ B. Homo sapiens $\newline$ C. Homo neanderthalensis $\newline$ D. Homo erectus

61. Three types of muscles are given as a, b and c. Identify the correct matching pair along with their location in the human body:

62. Match List I with List II:

63.

The 'Ti plasmid' of Agrobacterium tumefaciens stands for:

64.

Which one is the correct product of DNA dependent RNA polymerase to the given template? $\newline$ 3'TACGGCAAATACCTTAC5'

65. Match List I with List II:

66. Match List I with List II:

67. The flippers of the Penguins and Dolphins are an example of:

68. Match List I with List II:

69. Match List I with List II:

70.

$\newline$ Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. $\newline$ $\newline$ Assertion A: Breast-feeding during the initial period of infant growth is recommended by doctors for bringing a healthy baby. $\newline$ $\newline$ Reason R: Colostrum contains several antibodies absolutely essential to develop resistance for the newborn baby. $\newline$

71. Which of the following is not a component of the Fallopian tube?

72. Which of the following statements is incorrect?

73. Match List I with List II:

74. Match List I with List II:

75. Which of the following is not a natural/traditional contraceptive method?

76.

Following are the stages of pathway for conduction of an action potential through the heart: $\newline$ A. AV bundle $\newline$ B. Purkinje fibres $\newline$ C. AV node $\newline$ D. Bundle branches $\newline$ E. SA node $\newline$ Choose the correct sequence of pathway from the options given below:

77. Match List I with List II:

78. Match List I with List II:

79.

$\newline$ Consider the following statements: $\newline$ $\newline$ A. Annelids are true coelomates $\newline$ B. Poriferans are pseudocoelomates $\newline$ C. Aschelminthes are acoelomates $\newline$ D. Platyhelminthes are pseudocoelomates $\newline$

80. In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on:

81.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: The presence or absence of hymen is not a reliable indicator of virginity. $\newline$ $\newline$ Statement II: The hymen is torn during the first coitus only. $\newline$ $\newline$

82. Which one of the following factors will not affect the Hardy-Weinberg equilibrium?

83. The following diagram shows restriction sites in *E. coli* cloning vector pBR322. Find the role of ‘X’ and ‘Y’ genes:

84. Match List I with List II:

85.

$\newline$ Following are the stages of cell division: $\newline$ $\newline$ A. Gap 2 phase $\newline$ B. Cytokinesis $\newline$ C. Synthesis phase $\newline$ D. Karyokinesis $\newline$

86. Choose the correct statement given below regarding juxta medullary nephron.

87.

$\newline$ The following are the statements about non-chordates: $\newline$ $\newline$ A. Pharynx is perforated by gill slits. $\newline$ B. Notochord is absent. $\newline$ C. Central nervous system is dorsal. $\newline$ D. Heart is dorsal if present. $\newline$

88.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Mitochondria and chloroplasts are both double membrane-bound organelles. $\newline$ $\newline$ Statement II: Inner membrane of mitochondria is relatively less permeable, as compared to chloroplast. $\newline$ $\newline$

89.

$\newline$ Regarding catalytic cycle of an enzyme action, select the correct sequential steps: $\newline$ $\newline$ A. Substrate enzyme complex formation. $\newline$ B. Free enzyme ready to bind with another substrate. $\newline$ C. Release of products. $\newline$ D. Chemical bonds of the substrate broken. $\newline$

90. Match List I with List II:

91.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. $\newline$ $\newline$ Statement II: Both bone marrow and thymus provide microenvironments for the development and maturation of T-lymphocytes. $\newline$ $\newline$

92. Match List I with List II:

93.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: The cerebral hemispheres are connected by a nerve tract known as corpus callosum. $\newline$ $\newline$ Statement II: The brain stem consists of the medulla oblongata, pons and cerebrum. $\newline$ $\newline$

94. Match List I with List II:

95. Match List I with List II:

96.

$\newline$ Given below are two statements: $\newline$ $\newline$ Statement I: Gause’s competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely. $\newline$ $\newline$ Statement II: According to Gause’s principle, during competition, the inferior will be eliminated. This may be true if resources are limiting. $\newline$

97. Match List I with List II:

98. Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis from the given flowchart:

99.

As per ABO blood grouping system, the blood group of father is B⁺, mother is A⁺ and child is O⁺. Their respective genotype can be: $\newline$ A. IᴮIᴮ / Iᴬi / ii $\newline$ B. IᴮIᴮ / IᴬIᴬ / ii $\newline$ C. IᴬIᴮ / iiA / Iᴮi $\newline$ D. Iᴬi / Iᴮi / Iᴬi $\newline$ E. iIᴮ / iIᴬ / IᴬIᴮ

100. Match List I with List II related to the digestive system of cockroach: