(A) (i) Explain giving three reasons why tropics show greatest levels of species diversity.
(ii) Draw a graph showing species-area relationship. Name the naturalist who studied such relationship. Write the observation made by him.
OR
(B) (i) The world is facing the accelerated rate of species extinctions due to human activities. Explain any three major causes of biodiversity losses.
(ii) Describe 'Ex situ' approach for conserving biodiversity. Give any two examples.