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Solution


Q.

Tropical regions show greatest level of species richness because                                                                [2024]
A. tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.
B. tropical environments are more seasonal.
C. more solar energy is available in tropics.
D. constant environments promote niche specialisation.
E. tropical environments are constant and predictable.
Choose the correct answer from the options given below.
1 A, C, D and E only  
2 A and B only  
3 A, B and E only  
4 A, B and D only  

Ans.

(1)

Tropical regions show greatest level of species richness because of the following reasons:
(I) Tropical latitudes have remained relatively undisturbed for millions of years and thus, had a long evolutionary time for species diversification.
(II) Tropical environments are less seasonal, relatively more constant and predictable. Such constant environments promote niche specialisation and lead to a greater species diversity.
(III) There is more solar energy available in the tropics, which contributes to higher productivity; this in turn might contribute indirectly to greater diversity.