SELECT * FROM question_mgmt as q WHERE id=5589 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=11 AND subId=16 AND chapterId=463 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 7th science Fibre to Fabric make sketches of the two stages in the life histor

Question:

Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.

Answer:

The two stages in the life history of the silk moth are: Caterpillar and Cocoon.

              stages

1. Caterpillar: Bombyx mori, the domestic silk moth which helps in making warm clothes, is an insect from the moth family Bombycidae. The silkworm is the larva or caterpillar of a silk moth which is developed by the eggs that lays by female silkmoth. Silkworm is reared at the commercial level for obtaining silk. Silkworm feeds on mulberry leaves.

2. Cocoon: When the caterpillar is ready to enter the next stage of its life history called pupa. firstly it weaves the net to hold itself. during this, the caterpillar secretes a fibre that is made up of proteins which hardens on the exposure of air and becomes silk fibre. Soon the caterpillar completely coveres itself by silk fibre by making it and turns into the pupa. This covering is known as cocoon. The further development of pupa into moth continues inside the cocoon.

The silf yarn (thread) is obtained from the cocoon of the silkmoth.


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