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Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYBiodiversity and Conservation3 Marks
Question
Amazonian rain forest has the greatest biodiversity on earth. List any two hypothesis that are proposed by the biologists to account for the greater biological diversity.
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Answer

The hypothesis are:
  1. Speciation is generally a function of time; unlike temperate regions which are subjected to frequent glaciations in the past, tropical latitudes have remained undisturbed for millions of years and hence had a long time for species diversification.
  2. Tropical environments are less seasonal, relatively more constant and predictable; such constant environments promote niche specialisation and lead to a greater species diversity.
  3. There is more solar energy available in the tropics, which contributes to higher productivity; this in turn might contribute indirectly to species diversity.

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