Answer:
Plastids occur in most plant cells, but are absent in
animal cells. Like mitochondria, plastids also have their own genome (i.e.,
DNA) and ribosomes. They are self-replicating
organelles like the mitochondria, i.e., they have the
power to divide. Plastids are of following three types
1. Chromoplasts Coloured plastids (except
green colour). They add colour to organs e.g., flowers fruits, for attracting
animals to perform pollination and fruit dispersal.
2. Chloroplasts Green-coloured plastids. These are
the sites of photosynthesis and are present in the leaves of the plant.
3. Leucoplasts The colourless plastids.
Leucoplasts takes part in storage of food and can be present anywhere in an
organism.
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