Assertion (A): Aquatic species are more comfortable in cold water than in warm water. Reason (R): Solubility of oxygen gas in water decreases with increase in temperature.
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Colder water → more O$_2$ → supports aquatic life.
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.
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The Correct Option isA
Solution and Explanation
The assertion that fish and aquatic animals thrive better in cold water is directly explained by the fact that colder water holds more dissolved oxygen, a consequence of higher gas solubility at lower temperatures.