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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 ?

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Differences between Ape and Man

Ape

Man

1. Cranium expanded, maximum brain size 750 cc.

2. Less erect posture.

3. Strong jaws and without well marked
chin.

4. Incisor and canine teeth large.

5. Limited use and no manufacture of tools.

6. Not able to speak.

1. Cranium expanded, maximum brain size 2,250 cc.

2. Fully erect posture.

3. Small jaw with a prominent chin.

4. Incisor and canine teeth reduced.

5. Extensive use and manufacture of tools.

6. Able to use spoken and written language.

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86. Name the biggest of the land reptiles.

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

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

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