In which of the following is a contractile va | vedclass

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(C) Contractile vacuoles are primarily involved in osmoregulation and excretion in freshwater protozoans. $Plasmodium$ (a sporozoan) and $Monocystis$

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Both $(A)$ and $(B)$

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(C) Contractile vacuoles are primarily involved in osmoregulation and excretion in freshwater protozoans. $Plasmodium$ (a sporozoan) and $Monocystis$ (a gregarine sporozoan) are parasitic protozoans that live in isotonic environments (like the blood or coelomic fluid of hosts),where they do not face the challenge of excess water influx. Therefore,they lack contractile vacuoles. $Amoeba$,being a freshwater organism,possesses a contractile vacuole to expel excess water.

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

In which of the following is a contractile vacuole $NOT$ found?

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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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