Cell Membrane Definition Class 8. Cell membrane is a protective covering that acts as a barrier between the inner and outer environment of a cell (in animals). It is present in both plant and animal.
It is an additional covering over cell membrane. They are complex living structure. Cell membrane offers shape and rigidity to the cell.
A cell wall is a rigid structure present outside the plant cell.
It protects the integrity of the cell along with supporting the cell and helping to maintain the cell's shape. It comprises specific embedded proteins, which help in the exchange of substances in and out of the cell. Cbse class 8 revision notes and key points. The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell.it separates the cytoplasm (the contents of the cell) from the external environment.