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Question

The balancing structures in medusae of cnidarians are

A
Otoliths
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B
Statoliths
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C
Statocysts
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D
None of the above
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Solution

The correct option is C Statocysts
Statocyst is a small organ of balance and orientation in some aquatic invertebrates. It consists sensory vesicle containing statoliths. The statolith shifts as the animal move. Any movement large enough to throw the organism off balance causes the statolith to brush against tiny bristles which in turn send a message to the brain to correct its balance. so, the correct option is C

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