Why do all freshwater organisms need contractile vacuoles?
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The freshwater organisms are hypertonic and their surrounding water is hypotonic.
As a result water keeps rushing into the organism throughout the day.
So, they need contractile vacuole which pumps out the water by osmoregulation, thereby balancing the osmotic pressure.
As a result water keeps rushing into the organism throughout the day.
So, they need contractile vacuole which pumps out the water by osmoregulation, thereby balancing the osmotic pressure.
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Because of the cellular environment of a freshwater organism being hypertonic, the water diffuses inside the cell constantly and gets collected in thecontractile vacuole, which squeezes the extra water out of the cell periodically.
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