Question

what is meant by plastids?

Answer 1

In the Plant cells: Plastids: As previously mentioned, plastids are doubled membraned 'sac-like' organelles, generally involved in either the manufacture or storage of food.
An organelle found in the cells of plants, green algae, red algae, and certain other protists. Like mitochondria, plastids have an inner and outer membrane, and contain their own DNA and ribosomes. Some plastids, such as the chloroplasts in plant leaves, contain pigments.

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Answer 2

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The plastid is a membrane-bound organelle found in the cells of plants, algae, and some other eukaryotic organisms.