vacuole

Vacuole

The ______ is the membrane-bound space found in the cytoplasm. It contains water, sap, excretory product and other materials not useful for the cell.

Tonoplast

The vacuole is bound by a single membrane called ______.

Plant cells

In ______, the vacuoles can occupy up to 90 per cent of the volume of the cell.

Transport

In plant cells, the tonoplast facilitates the ______ of a number of ions and other materials against concentration gradients into the vacuole.

Amoeba

In ______, the contractile vacuole is important for excretion.

Protists

In many cells, as in ______, food vacuoles are formed by engulfing the food particles.