Assertion (A): Chrysophytes are found in both fresh water and marine environments and float passively in water currents.
Reason (R): Diatoms, a type of chrysophyte, have cell walls embedded with silica which makes them indestructible, contributing significantly to the formation of diatomaceous earth.

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Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

Both A and R are incorrect.

A is true but R is false.

answer is B.

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Detailed Solution

Chrysophytes are found in both fresh water and marine waters and, being photosynthetic, they are planktonic in nature; they float freely on water. They, being photosynthetic, are the major producers in the oceanic ecosystem.
Diatoms, a type of chrysophyte, have cell walls embedded with silica which makes them indestructible, contributing significantly to the formation of diatomaceous earth.

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