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

A cell wall is the outermost covering of a plant cell .

  • It is made up of a substance called Cellulose
  • Cellulose gives it strength and rigidity .
  • When fungi (and bacteria) are put into very dilute media . they tend to take up water from the outside and swell due to osmosis .
  • A dilute medium is known as a hypotonic solution . It has a higher concentration of water than inside the cell .
  • The swollen cell exerts a pressure against the cell wall , which exerts it back and keeps the cell in check due to its rigidity and hardness .

Hence, fungi are able to withstand very dilute media without bursting.

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Maninder Singh

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