Assertion (S): In Paramecium,the contractile | vedclass

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Question

(D) $1$. In $Paramecium$,the contractile vacuole is primarily involved in osmoregulation (water balance) rather than excretion of nitrogenous wastes.

Vedclass · Accepted Answer

$S$ is false and $R$ is true.

Vedclass · Answer

(D) $1$. In $Paramecium$,the contractile vacuole is primarily involved in osmoregulation (water balance) rather than excretion of nitrogenous wastes. Excretion in $Paramecium$ occurs mainly through the general body surface by diffusion.$2$. In $Planaria$ (a flatworm),specialized cells called flame cells (protonephridia) are responsible for osmoregulation and excretion.$3$. Therefore,the statement $S$ is false because the primary function of the contractile vacuole is osmoregulation,not excretion. The statement $R$ is true as flame cells are indeed the excretory structures in $Planaria$.

Column-$I$	Column-$II$
$(a)$ Protonephridia	$(I)$ In crustaceans like prawns.
$(b)$ Nephridia	$(II)$ In Platyhelminthes,rotifers,amphioxus.
$(c)$ Malpighian tubules	$(III)$ In insects including cockroaches.
$(d)$ Green glands	$(IV)$ In earthworms and other annelids.

$Assertion (S)$: In $Paramecium$,the contractile vacuole performs excretion.
$Reason (R)$: In $Planaria$,flame cells are present,which perform excretion.

Similar Questions

Salt excreting glands are found in . . . . . . .

Flame cells are also called $A$ and they are found in animals like $B$.

The excretory organ in crustaceans,like prawns,is:

Malpighian tubules are the excretory structures of

Choose the correct pair.
Column-$I$ Column-$II$
$(a)$ Protonephridia $(I)$ In crustaceans like prawns.
$(b)$ Nephridia $(II)$ In Platyhelminthes,rotifers,amphioxus.
$(c)$ Malpighian tubules $(III)$ In insects including cockroaches.
$(d)$ Green glands $(IV)$ In earthworms and other annelids.

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$Assertion (S)$: In $Paramecium$,the contractile vacuole performs excretion.$Reason (R)$: In $Planaria$,flame cells are present,which perform excretion.