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Evolution

Short Answer Type

41. Give a brief account on Darwin's Finches

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42.

While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.

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Long Answer Type

43. State and explain any three factors affecting allele frequency in populations.

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Short Answer Type

44.

Find out through internet and popular science articles whether animals other than man has self-consciousness.

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45. What is convergent evolution ?

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46. What are homologous organs ? Give examples.

Homologous organs are the organs which have a common origin and ancestory but have evolved to perform different functions.

Examples of homologous organs.
1. The wings of bird and bat, flipper (fin) of whale, structure of human forearm have common ancestory but perform different function.

2. In plants, the homologous organs may be a thorn of Bougainvillea or a tendril of cucurbita both arising in axillary position are examples of homologous organs.

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