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

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(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.

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(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 $Planaria$.

List-$I$	List-$II$
a) Leech	i) Flame cells
b) Locust	ii) Proboscis gland
c) Liver fluke	iii) Nephridia
d) Balanoglossus	iv) Malpighian tubules

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

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