Tejinder Kaur, Academic Content Creator at Edumarz
It is a double membrane bound cell organelle found in plant cells and algae.
Their main role is to manufacture and store food.
They also contain pigments that are used in the process of photosynthesis.
There are mainly three different types of plastids on the basis of absence or presence of pigments:
They are green colour biconvex shaped, double membrane cell organelle found in plant cells.
Act as sites for synthesizing food by process of photosynthesis.
It is the name given to all the colour pigments plastids synthesized in plants.
They are found in flowering plants, fruits and leaves.
They have carotenoid pigments which impart colour.
They are colourless plastids.
They are found in the non photosynthetic part of the plants.
They act as storehouse for lipids, proteins and starches.
It is of three types :
Amyloplasts – leucoplasts that store starch.
Proteinoplasts – leucoplasts that store protein.
Elaioplasts – leucoplasts that store fats and oils.
The term “vacuole” means “empty space”.
Helps in storage and disposal of waste substances.
The size of vacuole in plant cells are much larger than that of animal cells.
They are single membrane and their membrane is named as tonoplast.
A vacuole stores minerals, salts, pigments and proteins in a cell.
They are completely filled with water and exert a pressure on the cell wall. A pressure called as turgor pressure. This pressure helps in maintaining the shape of the cell.
The substance are taken inside vacuole by process of endocytosis and expelled out by exocytosis.