Assertion :Volume and fluidity of intestinal contents have increased in a person. Reason: The person drank sea water.

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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Both Assertion and Reason are incorrect

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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
If sea water is drunk, its Mg2+ ions increase the solute concentration in the intestinal lumen because Mg2+ is absorbed very slowly.
The osmotic effect of Mg2+ in the intestinal lumen prevents water absorption from the intestine. Mg2+ draws water from the blood to the intestinal lumen by osmosis.
So water is not gained, but is lost from the blood on drinking sea water. Hence, The person drank sea water and the volume and fluidity of intestinal contents have increased in a person.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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