76. The radiation belts are zones in space around the

A. Earth
B. Jupiter and Saturn
C. Mercury
D. Earth, Jupiter and Saturn

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77. The periods of different eras are further divided into

A. Eons
B. Epochs
C. Stages
D. Any of the above

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78. The Plio-Pleistocene boundary lies about ____ years ago, at the beginning of the interval of warming after the last Pleistocene glaciations.

A. 1,00,000
B. 1,000
C. 10,000
D. 100

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79. The production of wheat has increased mainly due to

A. Increase in area under wheat
B. Increase in yield per hectare
C. Increase in demand for wheat
D. Increase in prices

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