Question

effects of water movement on cells that lack a cell wall (d2.3.5) effects of water movement on cells with a cell wall (d2.3.6) describe the role of a contractile vacuole

Explanation:

A contractile vacuole pumps out excess water from a cell. In organisms like protozoa that lack a rigid cell - wall, water can enter by osmosis. If not regulated, the cell could burst. The contractile vacuole collects the incoming water and expels it, maintaining the cell's osmotic balance.

Answer:

The role of a contractile vacuole is to expel excess water from a cell, thereby maintaining osmotic balance, especially in cells without a rigid cell - wall that are prone to osmotic swelling.