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Evolution

Short Answer Type

81. How were mammals better than the other organisms?

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82. Describe three mechanisms by which genetic variability can be produced in nature.

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83. Discuss the role of variations in evolution.

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84. The homology in haemoglobin of man and gorilla is 99 per cent. What explanation would you give for this finding ?

The similarity in haemoglobin (a protein) shows that gorilla and man have a common ancestor and are close to each other in phylogeny. Such a similarity is termed molecular homology.

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Long Answer Type

85. Differentiate apes and man.

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One Word Answers

86. Name the biggest of the land reptiles.

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Short Answer Type

87. List the chronological sequence of evolution of genus Homo.

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88. Give important characteristics of the skull of Australopithecus.

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One Word Answers

89. Name the man-like primates in the evolutionary history of man which started tool making?

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Short Answer Type

90. What role fire played in the early evolutionary history of man ?

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