145
Question
Amoeba taken downstream to estuary will show
Amoeba taken downstream to estuary will show
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Solution
The correct option is C Disappearance of contractile vacuole
In the freshwater environment, water is constantly moving into the amoeba because it contains more concentrated solutes than its environment. The amoeba collects the excess water in the contractile vacuole which removes the excess water. As the amoeba moves into the brackish environment, the net water movement into the amoeba will slow (as compared with the freshwater environment). The contractile vacuole will contract less frequently. As the amoeba enters the seawater environment, the net water movement will be from the paramecium to the environment. Water will move out of the cell, and the cell will shrink. Thus, the correct answer is option C.
In the freshwater environment, water is constantly moving into the amoeba because it contains more concentrated solutes than its environment. The amoeba collects the excess water in the contractile vacuole which removes the excess water. As the amoeba moves into the brackish environment, the net water movement into the amoeba will slow (as compared with the freshwater environment). The contractile vacuole will contract less frequently. As the amoeba enters the seawater environment, the net water movement will be from the paramecium to the environment. Water will move out of the cell, and the cell will shrink. Thus, the correct answer is option C.
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