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Are the different types of plastids interchangeable? If yes, give examples where they are getting converted from one type to another.

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Ans. Yes, different types of plastids are interchangeable under different stages of development of the plant or due to some external cause involved.

There are three types of plastids: chromoplasts, chloroplasts and leucoplasts. Chloroplasts are plastids that contain a green pigment called chlorophyll and carotenoid pigments. In some situations, generally in mature leaves, the carotenoid increases in proportion to the chlorophyll.

The green colour decreases due to the loss of chlorophyll. This loss converts the chloroplast to chromoplast giving the leaves dark brown and reddish appearance. Similarly, flowers and fruits get their colour due to the conversion of chloroplast into chromoplast.

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