Freshwater protozoans have _______to eliminate excesswater from the body
Answers
answer
hopotonic
Explanation:
Since, freshwater is hypotonic to the cytoplasm of Amoeba, there is a continuous endosmosis or in flow of water into the body. ... Hence, all freshwater protozoans, including Amoeba, possess one or two contractile vacuoles for elimination of excess water from the body, ie, osmoregulation.
Answer:
The contractile vacuole
Explanation:
The contractile vacuole is a specialized type of vacuole that regulates the quantity of water inside a cell. In freshwater environments, the concentration of solutes is hypotonic, lesser outside than inside the cell. Under these conditions, osmosis causes water to accumulate in the cell from the external environment. The contractile vacuole acts as part of a protective mechanism that prevents the cell from absorbing too much water and possibly lysing (rupturing) through excessive internal pressure.
The contractile vacuole, as its name suggests, expels water out of the cell by contracting.