NEET BIOLOGY

Detailed explanation-1: -The contractile vacuole (CV) complex is an osmoregulatory organelle of free-living amoebae and protozoa, which controls the intracellular water balance by accumulating and expelling excess water out of the cell, allowing cells to survive under hypotonic stress as in pond water.

Detailed explanation-2: -The contractile vacuoles work like a pump to control the amount of water that comes into the cell by holding it inside the contractile vacuole until it expands and is full. Once the contractile vacuole is full, it contracts and expels the excess water outside of the cell.

Detailed explanation-3: -Proteins found in the tonoplast (aquaporins) control the flow of water into and out of the vacuole through active transport, pumping potassium (K+) ions into and out of the vacuolar interior. Due to osmosis, water will diffuse into the vacuole, placing pressure on the cell wall.

Detailed explanation-4: -A contractile vacuole works just the same as the name suggests, in that it expands and contracts. The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure. It maintains the shape and internal pressure of the cell.

Detailed explanation-5: -Depending on the species, a paramecium has from one to several contractile vacuoles located close to the surface near the ends of the cell. Contractile vacuoles function in regulating the water content within the cell and may also be considered excretory structures, since the expelled water contains metabolic wastes.