Assertion : Darwin's finches show a variety of beaks and cactus seeds.
Reason : Ancestral seed-eating strock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Island, where they found competitor-free new habitats.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are ture but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

A

Explanation

Darwin finches are an excellent example of the way in which the species gene pools have adapted in order for long term survival via their offspring. Finches were formed due to divergent evolution (adaptive radiation) to avoid interspefic competition. The common birds of Galapagos islands, the finches were markedly different from the finches had beak of different shapes and sizes, and adapted for feeding on completely different diets. Darwin also found that fossils of Galapagos islands are most similar to living species of south America. the food supply increases in arithmatic ratio but the population increases in geometic ratio. with the study of this theory it struck to Darwin that there is struggle for existence among plants and animals.