Question

Types of plastids
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Answer 1

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★ Plastid is a membrane-bound organelle found in the cell of plants, algae and few eukaryotic cells.

★ The types of plastids are-

1) Chloroplasts:- are the green plastids which contain chlorophyll pigments for photosynthesis.

2) Chromoplasts:- are the coloured plastids for pigment synthesis and storage.

The pigment present in them is carotene which gives a different colour to fruits and flowers.

3) Gerontoplasts:- are the chloroplasts that are going through the ageing process.

These are present in the leaves in which no more photosynthesis occurs (such as in the fall months).

4) Leucoplasts: are the colourless plastids for monoterpene synthesis found in non- photosynthetic parts of the plants.

They are of three types:-

a) Amyloplasts- stores starch.

b) Proteinoplasts- stores proteins.

c) Elaioplasts- stores fats and oils.

Answer 2

Answer:

Plastids :-

• are found in all plant cells and in euglenoids .

• these are easily observed under microscope as they are large.

• they bear some specific pigments, thus imparting specific colors to the plants.

☆ Based on the type of pigments plastids can be classified into :-

• CHLOROPLASTS.

• CHROMOPLASTS .

• LEUCOPLASTS .

● the leucoplasts are the colourless plastids of varied shapes and sizes with stored nutrients :-

• Amyloplasts ( stores carbohydrates/starch )

• elaioplasts ( store oils and fats )

• aleuroplasts ( store proteins ) .