A cnidarian receives nutrients and oxygen by diffusion from its _______

blood vessel

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lymph vessel

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gastro-vascular cavity

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book lungs and villi

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Solution

The correct option is C gastro-vascular cavity
The body of cnidarians enclose a single cavity called coelenteron. It has a single aperture, mouth and no anus. The mouth serves both for taking food and for throwing out faeces. Such a digestive cavity is said to be incomplete. Coelenteron is also known as gastrovascular cavity as it also distributes food and oxygen besides digesting it. There are no blood vessels, lymph vessels, book lungs and villi in coelenterates.
Thus, the correct answer is option C.

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