why do plantcells have an additionl layer surrounding the cell membrane? What is this layer known as?
- Plants are immobile and hence, need protection against variations in temperature, high wind speed, atmospheric moisture, etc. These variations can damage the plant cell and can even kill them.
- Like animals, plants do have an outer covering in the form of cell membrane.
- The cell membrane is flexible and semi-permeable and hence, cannot fight the adverse variations on its own.
- Therefore, a stiff outer covering is present in plant cells which protects and gives shape and rigidity to the cell. This additional layer is called the cell wall. It is made of cellulose.
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