Question

Give reasons for the following:

a. Earthworms come out of the soil during heavy rains.

b. We find long chimneys in factories.

c. During an incident of fire, one is advised to wrap a woollen blanket over a burning object.​

Answer 1

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1. Oxygen diffuses easily through air, and the soil stays aerobic because oxygen comes in from the surface.” But after a rain, the soil pores and the worm burrows fill with water. “The worms can't get enough oxygen when the soil is flooded, so they come to the surface to breathe.”
2. Burning of fuel takes place in factories, it produces smoke which contains a few harmful gases and fine dust particles. The chimneys in factories take the harmful smoke and gases away from us.
3. Blanket cuts the supply of oxygen to the object that is burning, thereby prevents it from further burning.

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Answer 2

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A. When it rains heavily, water fills up the spaces occupied by the air in the soil. In this situation, earthworms come out of the soil for respiration

B. Burning of fuel takes place in factories, it produces smoke which contains a few harmful gases and fine dust particles. The chimneys in factories take the harmful smoke and gases away from us.

C. The woollen blanket cuts off the supply of air (oxygen) which is helping in the burning of the object. When the supply of oxygen is cut out, the object stops burning

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