Assertion :Water vascular system is the characteristic of echinoderms. Reason: Main function of water vascular system is locomotion.

Both assertion and reason are correct and the reason is the correct explanation for assertion.

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Both assertion and reason are correct but the reason is not the correct explanation for assertion.

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Assertion is correct but the reason is incorrect.

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Both assertion and the reason are incorrect.

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Solution

The correct option is B Both assertion and reason are correct but the reason is not the correct explanation for assertion.
The water vascular system or ambulatory system is a unique system of echinoderms that helps mainly in locomotion. It is a modified system of canals containing seawater and amoeboid corpuscles. It helps in locomotion by providing a hydraulic pressure mechanism of tube feet that may serve for the respiratory exchange of gases. Tube feet also help in anchoring the body to the substratum and in capturing and handling the food.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.'

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