Drains get blocked by :

Oil and tea leaves.

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Oil and chemicals.

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Chemicals and soil.

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Chemicals and water.

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Solution

The correct option is D Oil and chemicals.
Cooking oil and fats should not be thrown down the drain. They can harden and block the pipes. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water. Throw oil and fats in the dustbin. Chemicals like paints, solvents, insecticides, motor oil, medicines may kill microbes that help purify water. So do not throw them down the drain.
So, the correct answer is 'Oil and chemicals.'

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Question 18

Why should we not throw
(a) Used tea leaves into the sink?
(b) Cooking oil and fats down the drain?

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