Assertion :Most marine animals find it difficult to live in fresh water and vice versa. Reason: Some animals can tolerate a narrow salinity range while others can bear a wide salinity range.

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
Most marine animals find it difficult to live in fresh water and fresh water animals find it difficult to live in marine environment because fresh water organisms are adapted to maintain their osmotic concentration against a particular concentration in aquatic medium and same for marine animals. Some animals can tolerate wide range of salinity and others are limited to narrow range called stenohaline and most of the organisms are stenohaline
So, the correct option is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'

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