Plastids are organelles that are found in plant cells and certain algae. They are responsible for various functions such as photosynthesis, storage of starch, and synthesis of pigments and lipids. Here is a brief note on plastids.

Types of Plastids

Plastids can be classified into three main types:

1. Chloroplasts - Responsible for photosynthesis and contain chlorophyll pigments. They are found in green parts of the plant such as leaves.

2. Chromoplasts - Synthesize and store pigments such as carotenoids that give color to fruits, flowers, and roots.

3. Leucoplasts - Store starch, lipids, and proteins. They are found in non-photosynthetic tissues such as roots and seeds.

Structure of Plastids

Plastids have a double-membrane envelope that encloses a fluid-filled stroma. The stroma contains DNA, ribosomes, and other enzymes required for plastid functions. Chloroplasts have a unique structure called thylakoids, which are stacked in grana. Thylakoids contain photosynthetic pigments and enzymes.

Functions of Plastids

1. Photosynthesis - Chloroplasts are responsible for photosynthesis, which is the process of converting light energy into chemical energy.

2. Storage - Leucoplasts store starch, lipids, and proteins. Chromoplasts store pigments.

3. Synthesis - Plastids are involved in the synthesis of pigments, lipids, and other compounds required for plant growth and development.

In conclusion, plastids are important organelles in plant cells that are responsible for various functions such as photosynthesis, storage, and synthesis. They are classified into three main types, have a unique structure, and contain enzymes required for plastid functions.

Plastids are the cell organelles that are present in plants.There are three types of plastids, chloroplast, leucoplast, chromoplast... leucoplast are colourless plastids, Chloroplast's are green in colour, green part of the plant is called chloroplast,it makes food..third one chromoplast, it contains all colour, it is found in fruits, leaves....