Q.

Assertion: Diatoms have indestructible cell walls

Reason: Diatoms have silicified cell wall.

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a

Assertion and reason are incorrect.

b

Both assertion and reason are true but reason does not explain the assertion.

c

Assertion is correct and reason is incorrect.

d

Both assertion and reason are true. and reason correctly explains the assertion.

answer is A.

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Detailed Solution

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Cell wall of diatoms is indestructible as it is made of biosilica.

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