Plastids are found only in plant cell. most of the plastids contain pigment containing pigments.their walls are made up of double membrane but do not contain crystals like structures, plastids have been classified into three categories for many different works.
- leucoplast which collects water droplets.
- chromoplasts have different colours.they offer colour to flowers and fruits.
- chloroplast has green colour. it is responsible for food production through photosynthesis.
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