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Question

Which of the following has a necessity of air?



A

Agriculture

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B

Windmills

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C

Dispersal of seeds

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D

Sound propagation

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Solution

The correct options are
A

Agriculture


B

Windmills


C

Dispersal of seeds


D

Sound propagation


(i) Oxygen present in air is required for the growth of the crops. Also, the air is needed to speed up the drying of agricultural products like grains, pulses, fruits, etc.

(ii) The blades of the windmills rotate due to wind (moving air). This mechanical energy produced is used for tasks such as grinding grains, pumping water or generation of electricity. Without wind, windmills will not rotate and no energy will be generated.

(iii) Air acts as a carrier to disperse seeds around and help them grow.

(iv) Air acts as a medium for sound waves to travel.


Chemistry

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