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Question

Give functions.
A. Plasma membrane
B. Cytoplasm
C. Lysosome
D. Vacuole
E. Nucleus

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Solution

a. Functions of the plasma membrane:

  • It gives shape and support to the cell.
  • It acts as a mechanical barrier to protect the internal contents of the cell.
  • It separates the contents of the cell from its surrounding medium.
  • It performs physical activities such as diffusion and osmosis.


b. Functions of cytoplasm:

  • It is the medium for all cellular chemical reactions.
  • It is a medium in which the organelles remain suspended.
  • It helps in the movement of the different cellular elements.


c. Functions of lysosomes:

  • Lysosomes destroy foreign materials that enter the cell.
  • Dead and worn-out organelles are removed by lysosomes.
  • Cells are autolysed by lysosomes, and their contents are released within the cell.


d. Functions of vacuoles:

  • The main function of vacuoles is to store food in a cell.
  • They also help in storing and expelling wastes and toxic by products of metabolic reactions.
  • They help in maintaining the turgidity and rigidity of a cell.

e. Functions of nucleus:
  • It is the control centre of a cell as it controls all the activities of the cell.
  • It also contains gene-containing chromosomes which are the units of inheritance in an organism.

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