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Cell Organelles - Plastids

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Plastids:

  • Plastids are present in most of the plant cells and absent in animal cells.
  • They are usually spherical or discoidal in shaped and double membrane bound organelles.
  • They also have their own DNA and ribosomes.

Plastids are of three types:

  • Chloroplasts: These are the green coloured plastids containing chlorophyll. Chloroplasts aid in the manufacture food by the process of photosynthesis.
  • Chromoplasts: These are the colourful plastids (except green colour).
  • Leucoplasts: These are the colourless plastids.

Function:

  • Chloroplasts trap solar energy and utilise it to manufacture food for the plant.

  • Chromoplasts impart various colours to flowers to attract insects for pollination.

  • Lecuoplasts help in the storage of food in the form of starch, proteins and fats.

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