1.

Which of the following statements describe natural extinction ? (i) Extinctions abetted by human activities (ii) Slow replacement of existing species (iii) Also known as background extinction (iv) A small population is most likely to be extinctA. (i) and (ii)B. (i), (ii) and (iii)C. (ii), (iii) and (iv)D. (i), (ii), (iii) and (iv)

Answer» Correct Answer - C
Natural or background extinction is a slow process of replacement of existing species with the better adapted species due to alternate evolution, changes in environmental conditions, predators and diseases. A small population due to inbreeding depression (reduces genetic variability) and normal population fluctuations during unfavourable periods like drought, harsh winter or severe summer.


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