Assertion :Diatom frustules pile up at the bottom of water bodies and form big heaps of diatomite or diatomaceous earth. Reason: Diatom frustules are resistant to natural degradation.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Diatoms are the organisms belonging to Chrysophytes of kingdom protista. Diatoms occur in all aquatic and moist terrestrial habitats. The cell wall is made of silica which is known as frustule. The frustule is made up of two valves, epitheca and hypotheca. The two valves fit together like a soap box. Diatom frustules pile up at the bottom of water bodies and form big heaps of diatomite or diatomaceous earth. It may extend for several hundred metres in certain areas from where the same can be mined. Diatom frustules are resistant to natural degradation. The siliceous frustules of diatoms do not decay easily.

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