LIFE SCIENCE

Detailed explanation-1: -Osmoregulation is essential to all organisms as it maintains homeostasis of the organism’s water content. Osmoregulation in unicellular freshwater organisms like amoebas and paramecia involves an organelle called the contractile vacuole, which collects excess water as it accumulates in the cell and pumps it out.

Detailed explanation-2: -The contractile vacuole contracts to expel its contents outside of the cell. It then returns to the diastole stage to refill with water and repeat the process as often as necessary to maintain osmoregulation. The purpose of the contractile vacuole is to serve as the cell’s pump for expelling excess water and waste.