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4th Feb 2021

Wednesday, 3 February 2021

STPM Biology Structure of Cell and Organelle (Part 17)

Vacuole


Distribution:

  • Found in plant cells.
  • Animal cells do not contain vacuoles.


Structure:

  • Varies in shape and sizes
  • Each vacuole in bounded by a membrane called tonoplast.
  • Vacuole is filled with fluid that consist of amino acids, sugars, minerals, waste products and pigments.


Structure of vacuole
Structure of vacuole

Functions:

  • Provides turgor pressure to support cell.
  • Temporary storage site for amino acids, sugars and waste products.
  • Important role in the growth of plant cells.
  • As protection. Vacuoles of some plants contain toxins which deter animals from eating the plants. 

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