What is the cell structure that collects extra water from the cytoplasm and expels it from the cell?

The correct answer is Contractile Vacuole. A contractile vacuole is a cell structure that collects excess water from the cytoplasm and expels it from the cell. It is commonly found in single-celled organisms living in freshwater environments. The contractile vacuole helps maintain osmotic balance within the cell by regulating the water content. When the vacuole fills up with water, it contracts and releases the water outside the cell, preventing it from bursting due to osmotic pressure.