How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?

A) with more contractions

B) with fewer contractions

C) the contractions would suddenly cease

D) with the same frequency of contractions

It would Shrivel, because the salt will come in and water will come out of cell because it is hypotonic soulution

Answer: A. more contraction

Osmoregulation is a process in which water content of the protoplasm of the cell are controlled. In amoeba the water content in the protoplasm is controlled by contractile vacuole. The protoplasm of the amoeba remains concentrated than the surrounding water. The water enters the protoplasm by osmosis through semi - permeable membrane. The excess of water is expelled out by contractile vacuole. Most seawater amoeba protoplasm lacks contractile vacuole because the salt concentration inside the protoplasm is same as that of the surrounding water so that no more water could enter inside the protoplasm which may result in rapture of the cell. When freshwater amoeba is placed in seawater than seawater being hypertonic the water will flow out of the cell the contractile vacuole will become more contracting to release water and the cell will shrivel up.