The soil pores block and become ineffective in filtering the water due to

Disposal of oil in drainage pipe.

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Disposal of oil in open drain.

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Disposal of oil in garden.

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None of the above.

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Solution

The correct option is B Disposal of oil in open drain.
Oil and fats can clog the drains reducing its effectiveness in filtering water. In open drains, they block the pores in the soil and thus hamper the filtration by soil. Hence, oil and fats should not be released into the drain.
So, the correct answer is 'Disposal of oil in open drain'.

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