Ultrastructure of Eukaryotic Cells 3
Biology: Cambridge International A Level, topic 1.1.5
Vacuole
Cell vacuoles are found in plant cell cytoplasm. Cell vacuoles are surrounded by a membrane called the tonoplast.
Structure of cell vacuoles
Structure of cell vacuoles
- Plant cells each have a large central vacuole that occupies most of the area of the cell.
- These vacuoles are surrounded by a membrane called the tonoplast and contain a weak solution of salts and sugars called cell sap.
- Cell vacuoles are found in the cytoplasm of plant cells but are NOT present in animal cells.
Function of cell vacuoles
- The central vacuole allows the cell to remain rigid.
- When the central vacuole holds more water, the vacuole pushes against the cell wall and pressure is maintained. This stops the plant from wilting.
- The vacuole also isolates certain chemicals that are unwanted by the rest of the cell.
Test yourself on Ultrastructure of Eukaryotic Cells 3
Where is the cell vacuole located?
The Consequences of Water Loss From Vacuoles