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Class 9
Chapter 5 Class 9 - The Fundamental Unit of Life

Plant cells are surrounded by an extra covering known as the cell wall.

It is the outermost covering of a plant cell

  • It separates the interior contents of the cell from the exterior environment
  • The cell wall is made up of a substance called Cellulose
  • Cellulose gives it strength and rigidity , which is not present or required in animal cells.
  • It provides protection from any physical stress as well as from the external environment .
  • Animal cell membranes are made of proteins which get denatured by relatively smaller changes in the environment (such as increase in temperature ).

Hence, plants can withstand much greater changes in the surrounding medium as compared to animal cells.

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo