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Question

Assertion: Ambulacral system plays a major role in locomotion of echinoderm.

Reason: Hydraulic pressure of fluid and contraction of muscle of tube feet make possible movement of echinoderm.

A
If both assertion and reason are true and reason is the correct explanation of assertion
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B
If both assertion and reason are true but reason is not the correct explanation of assertion
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C
If assertion is true but reason is false
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D
If both assertion and reason are false
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Solution

The correct option is A If both assertion and reason are true and reason is the correct explanation of assertion
The water vascular system is a unique organ system that functions in locomotion, feeding, respiration and excretion. Ambulacral canal is connected to outside through external tube feet. Hydraulic pressure of fluid and contraction of muscle of tube feet make possible movement of echinoderm.

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