Question

Differentiate between three types of plastids.

Answer 1

These are colourless plastids found in the storage organs. They are found large numbers in the cells of fruits, seeds, tubers etc. They are variously shaped, viz., oval, rod like, or filamentous. They lack grana and photosynthetic pigments. 

They are coloured plastids other than chloroplast. They contain fat soluble yellow orange and red pigments chiefly carotenoids. They provide colour to many flowers for attracting pollinating insects and to fruit for attracting animals for dispersal.


These are green coloured plastids containing the green pigment chlorophyll. They are the photosynthetic organelles of green plants. 

Answer 2

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chloroplasts :

Chloroplasts are probably the most important among the plastids since they are directly involved in photosynthesis. They are usually situated near the surface of the cell and occur in those parts that receive sufficient light, e.g. the palisade cells of leaves. The green colour of chloroplasts is caused by the green pigment chlorophyll. 

Leucoplast :

Leucoplasts are colourless plastids and occur in plant cells not exposed to light, such as roots and seeds. They are colourless due the absent of pigment 

chromoplast:

Chromoplasts are red, yellow or orange in colour and are found in petals of flowers and in fruit. Their colour is due to two pigments, carotene and xanthophyll.