- The anther wall consists of four wall layers where
(a) tapetum lies just inner to endothecium
(b) middle layers lie between endothecium and tapetum
(c) endothecium lies inner to middle layers
(d) tapetum lies next to epidermis. - The sperms undergo physiological maturation, acquiring increased
motility and fertilising capacity in
(a) seminiferous tubules (b) vasa efferentia
(c) epididymis (d) vagina. - Chromosome maps/ genetic maps were first prepared by
(a) Sutton and Boveri (1902)
(b) Bateson and Punnett (1906)
(c) Morgan (1910)
(d) Sturtevant (1911). - In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA)
is transcribed by
(a) RNA polymerase I (b) RNA polymerase II
(c) RNA polymerase III (d) all of these. - The pathogen Microsporum responsible for ringworm disease in
humans belongs to the same kingdom as that of
(a) Taenia, a tapeworm (b) Ascaris, a roundworm
(c) Rhizopus, a mould (d) Wuchereria, a filarial worm. - Which of the following is an example of mutation breeding?
(a) Pusa Swarnim, resistant to white rust
(b) Mung bean, resistant to yellow mosaic virus
(c) Pusa Sadabahar, resistant to chilli mosaic virus
(d) Pusa Gaurav, resistant to aphids - Nitrogen fixation in root nodules of Alnus is brought about by
(a) Frankia (b) Azorhizobium
(c) Bradyrhizobium (d) Clostridium. - In a polymerase chain reaction after the denaturation step why the
mixture needs to cool down to a lower temperature?
(a) To permit specific annealing of the primers.
(b) To give a halt to the reaction mixture.
(c) To increase the activity of enzyme Ta q polymerase.
(d) To obtain the multiple copies of the DNA. - Which variety of rice was patented by a U.S. company even though
the highest number of varieties of this rice are found in India?
(a) Sharbati Sonora (b) Co-667
(c) Basmati (d) Lerma Rojo - The prickly pear cactus became unusually abundant after its
introduction in Australia, because it
(a) had no coevolved herbivores
(b) formed new mycorrhizal association
(c) lost its thorns
(d) all of these. - In a comparative study of grassland ecosystem and pond
ecosystem, it may be observed that
(a) the abiotic components are almost similar
(b) the biotic components are almost similar
(c) both biotic and abiotic components are different
(d) primary and secondary consumers are similar. - Identify the wrong statement regarding post-fertilisation development.
(a) The ovary wall develops into pericarp.
(b) The outer integument of ovule develops into tegmen.
(c) The fusion nucleus (triple nucleus) develops intoendosperm.
(d) The ovule develops into seed.- A patient of diabetes mellitus excretes glucose in urine even when
he is kept on a carbohydrate free diet. It is because
(a) fats are catabolised in adipose tissues to form glucose
(b) amino acids are catabolised in kidney to form glucose
(c) amino acids are discharged in blood stream from liver
(d) glycogen from muscles is released in blood stream. - Cell bodies of neurons bringing afferent information into the
spinal cord are located in
(a) dorsal root ganglia (b) ventral root ganglia
(c) gray matter of the spinal cord
(d) white matter of the spinal cord. - Which of the following statement is incorrect regarding biodiversity?
(a) Biodiversity deals with biological and geographical units such
as genes, chromosomes, species, families and biogeographic
regions.
(b) Biodiversity is an addition sum of genetic, taxonomic and
ecosystem diversity.
(c) It is a measure of the amount of resources shared by the
human population.
(d) None of these - A lake near a village suffered heavy mortality of fishes within a
few days. Which of the following statements could be the correct
explanation for this?
(i) Lots of urea and phosphate fertilizers were used in the crops
in the nearby fields.
(ii) The croplands of the village were sprayed with DDT.
(iii) The lake water turned green and stinky.
(iv) Phytoplankton populations in the lake declined initially
thereby greatly reducing photosynthesis.
(a) (i) and (iii) (b) (i) and (ii)
(c) (ii) and (iii) (d) (iii) and (iv)
ANSWER KEY
- (c) 2. (d) 3. (c) 4. (b) 5. (a)
- (c) 7. (b) 8. (b) 9. (c) 10. (d)
- (c) 12. (a) 13. (b) 14. (c) 15. (a)
- (b) 17. (d) 18. (d) 19. (a) 20. (d)
- (b) 22. (a) 23. (d) 24. (b) 25. (b)
- (c) 27. (c) 28. (b) 29. (b) 30. (d)
- (a) 32. (c) 33. (b) 34. (a) 35. (c)
- (c) 37. (b) 38. (c) 39. (b) 40. (b)
- (b) 42. (a) 43. (a) 44. (b) 45. (b)
- (b) 47. (d) 48. (d) 49. (b) 50. (b)
- (a) 52. (d) 53. (d) 54. (c) 55. (a)
- (a) 57. (d) 58. (c) 59. (d) 60. (b)
- (b) 62. (a) 63. (c) 64. (b) 65. (d)
- (a) 67. (a) 68. (b) 69. (c) 70. (a)
- (c) 72. (d) 73. (c) 74. (d) 75. (b)
- (c) 77. (d) 78. (b) 79. (c) 80. (b)
- (a) 82. (a) 83. (c) 84. (a) 85. (c)
- (b) 87. (a) 88. (a) 89. (c) 90. (b)