Assertion :Keber's organ on Unio is situated in front of the pericardium. Reason: Keber's organ has an important role in excretion.

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.
Keber's organs are excretory organs in some molluscs. It is otherwise also called as 'pericardial gland' and is a large, reddish-brown glandular mass. It is situated anterolateral to the pericardium into which it discharges the waste material. They are collected from there by the kidney.
So, the correct answer is option B.

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