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Question

The most distinctive feature of echinoderms is the presence of

A
canal system
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B
water vascular system
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C
gastrovascular cavity
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D
radula
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Solution

The correct option is B water vascular system
The most distinctive feature of echinoderms is the presence of a water vascular system or ambulacral system that helps in locomotion, respiration and capturing food.

Canal system is unique to the members of phylum Porifera, such as the sponges.

A gastrovascular cavity is seen in coelenterates, which is a common cavity for both the digestive and circulatory systems.

The radula is a rasping organ present only in Mollusca and helps in acquiring food.

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