AIIMS 2012 Botany Salinity Tolerance Assertion Reason Question
Assertion : Some 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 tolerate a wide salinity range.
Both assertion and reason are true and reason is the correct explanation of assertion
Both assertion and reason are true but reason is not the correct explanation of assertion
Assertion is true but reason is false
Both assertion and reason are false
Correct Answer
Detailed Explanation
The assertion states that some marine animals find it difficult to live in fresh water and vice versa, which is true. Marine animals are adapted to high salinity environments, and sudden changes to low salinity can lead to osmotic stress. The reason provided explains that some animals can tolerate a narrow salinity range, while others can tolerate a wide range. This is also true, but it does not directly explain why marine animals struggle in fresh water. Therefore, while both the assertion and reason are true, the reason does not correctly explain the assertion, making option B the correct choice. Options A, C, and D are incorrect because they misinterpret the relationship between the assertion and reason.
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