Q.

Assertion: Gonyaulax multiply rapidly and exhibits red tides.Reason: Gonyaulax, release toxins which may result in the death of many marine animals such as fishes.

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a

Both assertion and reason are true and reason is the correct explanation of assertion.

b

Both assertion and reason are true but reason is not the correct explanation of assertion.

c

Assertion is true but reason is false

d

Both assertion and reason are false

answer is B.

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Detailed Solution

Gonyaulax releases toxins that can kill the aquatic fauna but it is not responsible for red tides. Red tides are due to massive growth of dinoflagellates like Gonyaulax and Gymnodinium in favourable conditions.
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Assertion: Gonyaulax multiply rapidly and exhibits red tides.Reason: Gonyaulax, release toxins which may result in the death of many marine animals such as fishes.