What is the difference between each type of plastid from another?

Leukoplasts – unpainted plastids, usually perform a storage function. Starch accumulates in the leukoplasts of potato tubers. Leukoplasts of higher plants can turn into chloroplasts or chromoplasts.
Chromoplasts are plastids stained in yellow, red or orange. Coloring of chromoplasts is associated with the accumulation of carotenoids in them. Chromoplasts determine the color of autumn leaves, flower petals, root crops, ripened fruits.
Chloroplasts are plastids carrying photosynthetic pigments – chlorophylls. They have a green color in higher plants, char and green algae.

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