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Question

Assertion: Aquatic animals have a faster breathing rate as compared to terrestrial animals.
Reason: Dissolved oxygen concentration is lesser than the atmospheric oxygen.

A
Both A and R are true and R is the correct explanation of A.
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B
Both A and R are true but R is not a correct explanation of A.
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C
A is true but R is false.
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D
A and R are false.
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Solution

The correct option is A Both A and R are true and R is the correct explanation of A.
Terrestrial animals can breathe the oxygen in the atmosphere, but animals that live in water need to use the oxygen dissolved in water. Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.

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