Marine protozoans lack a contractile vacuole | vedclass

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(C) The primary function of a contractile vacuole is osmoregulation,specifically the removal of excess water that enters the cell via osmosis in fresh

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They are isotonic with their environment

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(C) The primary function of a contractile vacuole is osmoregulation,specifically the removal of excess water that enters the cell via osmosis in freshwater environments. Marine protozoans live in a saline environment that is generally isotonic to their internal cellular fluids. Since there is no net influx of water into the cell,there is no requirement for an active water-expelling organelle like a contractile vacuole.

Column-$I$ (Protozoans)	Column-$II$ (Examples)
$P$. Amoeboid	$I$. Plasmodium
$Q$. Flagellated	$II$. Amoeba,Entamoeba
$R$. Ciliated	$III$. Paramoecium
$S$. Sporozoans	$IV$. Trypanosoma

Marine protozoans lack a contractile vacuole because:

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Match the following columns:
Column-$I$ (Protozoans) Column-$II$ (Examples)
$P$. Amoeboid $I$. Plasmodium
$Q$. Flagellated $II$. Amoeba,Entamoeba
$R$. Ciliated $III$. Paramoecium
$S$. Sporozoans $IV$. Trypanosoma

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