Long Answer Type1. Habitat loss- The destruction of habitat due to natural calamity or human activity may lead to extinction of many species and loss of biodiversity.
2. Disturbance and pollution. Large number of organisms are killed due to natural disturbances such as fire, tree fall, defoliation by insects. Human activities also lead to loss of biodiversity.
3. Introduction of exotic species. Introduction of new species into an area cause disturbances which may lead to disappearance of native species.
4. Co-extinction is when extinction of one species leads to the extinction of some other mutually dependent species.
Short Answer TypeLong Answer Type
One Word AnswersShort Answer TypeUsing a chart show the in situ and ex situ approaches of conserving biodiversity in India.
(i) Hot spots of biodiversity
(ii) Ex situ conservation
Give three hypotheses for explaining why tropics show greatest levels of species richness.
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