Question

describe various types of plastids in detail​

Answer 1

Explanation:

Plastids:

Membrane bound pigment containing bodies present in the cells are called plastids.

Types:

There are 3 main types of plastids:

• Chloroplasts
• Chromoplasts
• Leucoplasts

Chloroplasts:

It is site of photosynthesis.

• Chloroplasts vary in their shape and size with a diameter of 4-6 micro meter.
• Under electon microscope,chloroplasts show 3 main components:

1. The envelope
2. The stroma
3. The thylakoid

• Stroma contains proteins , some ribosomes and a small circular DNA.
• Thylakoids are flattened vesicles which arrange themselves to form grana and intergrana.
• Chloroplasts are self replicating organelles.

Chromoplasts:

• Chromoplasts impart colour to the plants other than green.
• They are present in petals of the flower and in the ripened fruit.
• They help in pollination and dispersal of seeds.

Leucoplasts:

• Leucoplasts are colourless.
• They are tiangular,tubular or of some other shape.
• They are found in underground parts of the plant and store food.

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