Plastid: Definition with Functions - QS Study
QS Study

Plastids are double membrane-bound organelles found in plants and some algae, which are mainly dependable for activities related to making and storing food. Plastids are prime in size among the organelles present in the cytoplasm. They can be seen clearly under the microscope. Plastids are not present in Fungi, Bacteria and Animal Cells.

Plant cells with visible chloroplasts

Plastids are mainly of two types: Leucoplastid or Leucoplast and Chromoplastid or Chromoplast. Leucoplastids are colorless and Chromoplastids are colored. Chromoplastid again is of two types Chromoplast and Chloroplast.

Some of the most common plastids include:

Function of Chloroplast or plastid

  • Chloroplast of green plants and algae are known to involve in a complex procedure wherein synthesis of food molecules takes place upon fixing atmospheric carbon dioxide and releasing oxygen molecule into the fresh air.
  • By trapping solar energy, green plastids manufacture food through photosynthesis
  • Chromoplasts provide colored to various flowering parts.
  • Leucoplasts help in storage of protein, starch, and oil.