Question

Why do plant cell have an additional layer surrounding the cell membrane?
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Answer 1

Explanation:

Because plants do not have any exo skeleton inside their bodies.So,to provide rigidity and ability to stand and grow ,they developed that additional layer .

Answer 2

The additional layer is is called cell wall. Plant cells have cell wall because it gives strength, protects the cell, gives it a shape and probides rigidity. Also cell wall is semi permeable which allows some important materials like oxygen and minerals to pass through it...

Hope it helps...