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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.

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47. What are analogous organs ? Give one example from plants and another from animals.

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48. What are vestigial organs ? Give examples.

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49. Write significance of vestigial organs.

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50. Describe one example of adaptive radiation

Adaptive radiation is process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography (habitats). This process occurs due to natural selection. An example of adaptive radiation is Darwin finches, found in Galapagos Island. A large variety of finches is present in Galapagos Island that arose from a single species, which reached this land accidentally. As a result, many new species evolved, diverged, and adapted to occupy new habitats. These finches developed different eating habits and different types of beaks to suit their feeding habits. The insectivorous, blood sucking, and other species of finches with varied dietary habits evolved from a single seed eating finch ancestor.

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