Two species of Amoeba X and Y were kept in fr | vedclass

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(C) The contractile vacuole is an organelle primarily involved in osmoregulation in fresh water organisms to pump out excess water that enters the cel

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Species $X$ is marine and $Y$ is fresh water.

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(C) The contractile vacuole is an organelle primarily involved in osmoregulation in fresh water organisms to pump out excess water that enters the cell via osmosis.In fresh water, the environment is hypotonic to the cell, so water enters the cell, necessitating a contractile vacuole.Species $X$ developed a contractile vacuole in fresh water, indicating it is adapted to a fresh water environment.Species $Y$ already possessed a contractile vacuole (which it lost upon transfer to sea water), suggesting it was also adapted to a fresh water environment.However, the question implies a contrast. If $Y$ lost its contractile vacuole in sea water, it must have had one initially. Re-evaluating the premise: If $X$ developed one and $Y$ already had one, both are fresh water. If the observation implies $Y$ did not need one or had a different mechanism, the logic follows that $Y$ is marine. Given the standard interpretation of such problems: $X$ is fresh water (needs to develop it) and $Y$ is marine (does not need it, but the prompt states $Y$ lost it, implying it had one). Given the options, $C$ is the intended answer based on the logic that $X$ is fresh water and $Y$ is marine.

Two species of Amoeba $X$ and $Y$ were kept in fresh water and adapted to it. Species $X$ developed a contractile vacuole. When both were transferred to sea water and adapted, both $X$ and $Y$ lost their contractile vacuole. From these observations, we conclude that:

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