Assertion :Ball and socket joints are the most mobile joints. Reason: Synovial fluid is present here.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Synovial fluid is a thick sticky fluid secreted by synovial membranes into the synovial cavity. Though, the presence of synovial fluid is one of the reasons behind the mobility of the joints, the most accurate reason is the arrangement of the bones at the joint, the spheroidal ball-like end of one bone articulates here with the cup-shaped depression in another. This allows the bone with the ball head to be moved freely in many planes. Shoulder joints and hip joints are the ball and socket joints.
Therefore, the correct answer is option B.

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