In animal cells, vacuoles are smaller in size and fewer in number. The vacuoles contain ingested food material. These vacuoles are called food vacuoles. In unicellular organisms, vacuoles act as excretory organelles.
In plant cells vacuoles are larger in size and contains vacuolar sap. The vacuolar sap contains mineral salts, sugars, amino acids, proteins, waste products and water soluble pigments. In mature plant cells, the small vacuoles fuse to form a single large central vacuole which occupies upto 90% of the volume of the cell.