On the basis of contractile vacuole, give the name of phylum/class with one example.

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Solution

Contractile vacuole:
It is a type of organelle that expands and contracts.
It helps in regulating water levels in and out of the cell.
Therefore, it functions to maintain osmoregulation.
The phylum/class that bears contractile vacuole is Porifera.
Example: Hydra bears a contractile vacuole to maintain osmoregulation in its body.

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