Assertion :Blood flows at a very slow velocity in the lacunae and sinuses of prawn. Reason: This happens because of the absence of heart in the prawn

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 C Assertion is correct but Reason is incorrect
Lacunae and sinuses are the open spaces and channels present in the tissues of prawn. Prawn possesses a heart which pumps the oxygenated blood into some arteries. These arteries directly open into the lacunae and
sinuses. The tissues are thus in direct contact with blood. A sufficiently high blood pressure, however, cannot be maintained in the open lacunae and sinuses inspite of the pumping action of the heart. So, blood flows at a very slow velocity in the lacunae and sinuses.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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