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: -However, many unicellular protists do not possess a rigid cell wall. Instead, these protists use a third strategy: they employ water pumps called contractile vacuoles (CVs) to remove excess water.

Detailed explanation-3: -Wastes, such as ammonia, are soluble in water; they are excreted from the cell along with excess water by the contractile vacuoles. Contractile vacuoles function in a periodic cycle by expanding while collecting water and contracting to release the water.

Detailed explanation-4: -The contractile vacuole is an osmoregulatory organelle found amongst the Amoeba. This controls the water balance by releasing or accumulating water into the cell or out of it. They perform in a periodic manner by expanding while collection and contracting during release.

Detailed explanation-5: -Hint: In protists and unicellular algae, the contractile vacuole is a form of vacuole. In these organisms, these vacuoles play a role in osmoregulation. It also prevents these organisms from bursting due to high internal pressure.