what will happen if contractile vacuole is absent in amoeba? Give two points
Answers
Contractile vacuoles, common in freshwater Protozoa, eliminate water that moves into the cells by osmosis. The contractile vacuole is present in amoeba but absent in Entamoeba because Amoeba lives in water and needs osmotic regulation. The contractile vacuole is basically a water bubble within the endoplasm of A. proteus. Its function is to regulate the water content of the cell. It is also a means of excreting its waste from the cell (out through the cell membrane) via diffusion. E. histolytica doesn't need to have a contractile vacuole as it lives in an isotonic environment. Since the osmotic concentration of its body remains equal to its surroundings entry of water through osmosis will not happen. Therefore, there is no need of contractile vacuole. Thus, the correct answer is B.
HOPE IT HELPFUL TO YOU
CLICK ON THANK YOU..
Answer:
Without the contractile vacuole, the amoeba may burst. Undoubtedly it is a very important organelle with an essential function to the amoeba.
The plasmalemma around amoeba is semipermeable and as the water of the pond in which this animal lives hypotonic to the cytoplasm of its body. According to the law of diffusion large amount of water enters the body. If all this water is allowed to remain in the body, the body will swell and ultimately burst.
Hence, a special arrangement is required for the removal of this excess water is amoeba and this is done by the contractile vacuole. The vacuole bursts to the outside disappears and soon reappears. The process goes on continuously.