21: In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the
1. decomposer microorganisms to the surface.
2. nutrients to the surface.
3. bottom-dwelling organisms to the surface.
Which of the statements given above is/are correct ?
(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only
22: Consider the following Viceroys of India during the British rule:
1. Lord Curzon
2. Lord Chelmsford
3. Lord Hardinge
4. Lord lrwin
Which one of the following is the correct chronological order of their tenure?
(a) 1-3-2-4
(b) 2-4-1-3
(c) 1-4-2-3
(d) 2-3-1-4
23: Poison glands of snakes are homologous to
(a) electric organs of fishes
(b) stings of rays
(c) sebaceous glands of mammals
(d) salivary glands of vertebrates
24: The pitch of the voice of women is in general
(a) marginally lower than that of men
(b) higher than that of men
(c) much lower than that of men
(d) the same as that of men
25: Many transplanted seedlings do not grow because
(a) the new soil does not contain favourable minerals
(b) most of the root hairs grip the new soil too hard
(c) most of the root hairs are lost during transplantation
(d) leaves get damaged during transplantation