An Amoeba taken downstream to an estuary will | vedclass

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(A) When an $Amoeba$ is moved from freshwater to an estuary (which is a brackish or marine environment),the external medium becomes hypertonic or isot

Vedclass · Accepted Answer

Disappearance of contractile vacuole

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(A) When an $Amoeba$ is moved from freshwater to an estuary (which is a brackish or marine environment),the external medium becomes hypertonic or isotonic compared to the cell cytoplasm.The contractile vacuole in $Amoeba$ is primarily responsible for osmoregulation,specifically for pumping out excess water that enters the cell via endosmosis in freshwater environments.In an estuary,the salt concentration is higher,which reduces or eliminates the osmotic influx of water into the cell. Consequently,the contractile vacuole is no longer required for water expulsion and eventually disappears.

An $Amoeba$ taken downstream to an estuary will show:

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