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The plastids or plastids They are a group of specific plant cell organelles, which have characteristics similar to mitochondria such as: double membrane, own DNA and endosymbiont origin.

Plastids develop from proplastids, which are small organelles present in the immature cells of plant meristems and develop according to the needs of the cell, emerging different types of plastids such as: chromoplasts (which contain pigments), leukoplasts (without pigment), etioplasts (which develop in the absence of light), amyloplasts (which accumulate starch as a reserve substance), proteoplasts (which store protein) and the oleoplasts (accumulate lipids).

The chloroplasts are a type of chromoplasts that contain pigment called chlorophyll, which are capable of absorbing electromagnetic energy from sunlight and converting it into chemical energy by a process called photosynthesis.
Plant cells and green algae have a large number of chloroplasts, spherical or ovoid, varying in size according to cell type, and are much larger than mitochondria.