Plant cells have organelles which act as colour bags called the Plastids. They are organelles found exclusively in plant cells and absent in animal cells.
They are colourful cell organelles which impart colours to the various parts with the help of pigments present in them.
What are the different types of Plastids?
Plastids are classified based on the coloured pigments they contain. The three major categories are:
Chloroplast
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- It is the principal plastid found in leaves and has a double membrane
- The outer membrane is protective in The inner membrane encloses within itself a sponge-like matrix called the Stroma.
- The most important component of the chloroplast is its own DNA and ribosomes which help it to replicate on its
- The stack-like structures present in the Chloroplast are called the Grana (Singular granum) which are made up of numerous discs called Thylakoids.
- Each thylakoid contains the coloured pigments called the Chlorophyll pigments which are necessary for photosynthesis.
Chromoplast
- They are heterogeneous organelles which are different in every
- They contain different coloured pigments which impart attractive colours to flowers and fruits.
Leucoplast
- They are colourless organelles which act as bulk storage
- They store a large amount of starch, other sugars, proteins, and
- Cells of roots, bulbs, and other storage organs contain more number of leucoplasts.
Summary
| Plastids | Plant cells have organelles which act as colour bags called the Plastids. |
| Types of Plastids | Chloroplast
Chromoplast Leucoplast |