Q39 of 141 Page 14

Mention any two situations where muscular energy of animals is utilized to do mechanical work.

(i) To burn the dry bio-mass, like cattle dung, directly to produce heat.
(ii) To convert the bio-mass into more useful fuels and then use these fuels for heating purposes.

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37 Mention any two advantages and disadvantages of producing hydroelectricity by building dams on rivers. 38 Name the process that converts solar energy into chemical energy in nature. 40 Why is burning firewood in traditional chulhas considered disadvantageous? 41 Name the main constituent of biogas.