Given below are two statements: one is labeled Assertion (A) and other is labeled Reason (R).
Assertion (A): Sharks have to swim constantly to avoid sinking.
Reason (R): Air bladder is absent in sharks.
In the light of above statements, choose the correct answer from the options given below.

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A and R are true, R explains A.

A and R are false.

A and R are true, R does not explain A.

A is true, R is false.

answer is A.

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Detailed Solution

Assertion (A): Sharks have to swim constantly to avoid sinking.

Reason (R): Air bladder is absent in sharks.

The correct answer is:

a) Both A and R are true, and R is the correct explanation of A.

Explanation: The assertion (A) is true. Sharks, lacking an air bladder, rely on forward motion to keep water flowing over their gills, allowing them to extract oxygen from the water. If a shark stops swimming, it will begin to sink because it lacks the buoyancy provided by a swim bladder.

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