What are contractile vacuoles?

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What are contractile vaculoes?

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  1. Contractile vacuoles occur in some unicellular freshwater organisms, e.g, Amoeba, Paramoecium, Chlamydomonas. The vacuoles are specialised to collect liquid from the cell, swell up, rise to the surface and burst to release their contents. They take part in osmoregulation and excretion.

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