| Ecologists and evolutionary biologists have proposed various hypothesis; some important ones are: |
| (I) Speciation is generally a function of time. |
| These regions have witnessed frequent\ glaciations in the past-A |
| (II) Areas that have remained relatively undisturbed for millions of years and thus had a long evolutionary time for species diversification - B |
| (III) An environment which is less seasonal, relatively more constant and predictable. Such constant environments promote niche specialisation and lead to a greater species diversity-C |
| (IV) There is more solar energy available in the _D_. It contributes to higher productivity this in turn might contribute indirectly to greater diversity. |
A) A-tropics, B-tropical latitudes, C-temperate, D-arctic tundra
B) A-temperate, B-tropical latitudes, C-tropics, D-chaparral
C) A-temperate, B-tropical latitudes, C-chaparral D-tropics
D) A-temperate, B-tropical latitudes, C-tropical climate, D-tropics
Correct Answer: D
Solution :
(I) Speciation is generally a function of time. Temperate regions were subjected to frequent glaciations in the past. (II) Tropical latitudes have remained relatively undisturbed for millions of the years and thus, had a long evolutionary time for species diversification. (III) Tropical environments, unlike temperate ones are less seasonal, relatively more constant and predictable. Such constant environment promotes niche specialisation and leads to a greater species diversity. (IV) There is more solar energy available in the tropics, which contributes to higher productivity. This in turn might contribute indirectly to greater diversity.
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