Question

why do plant cells have an additional layer surrounding the cell membrane? ​

Answer 1

Answer:

Plant cell contain 3 layers which are called- Middle lamella, Primary cell wall and secondary cell. Middle lamella is the outer most layer containing pectins. ... The additional layers provide rigidity, protection,support,and also regulate the growth and diffusion of substance into the cell, storing the foods.

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Answer 2

Explanation:

The cell membrane is a flexible and semi-permeable membrane and cannot fight the adverse climatic changes in its own. Therefore, a stiffer outer covering is present which protects and gives shape to the plant cell. This layer is called the cell wall.

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