Question

have to be stored carefully so that insects do not
them. Putting naphthalene balls or dry neem leave
the folds of such clothes protects them from inse
A. Answer these.
1. Name two fibres that we get from animals
2. What is a cocoon?
3. How is yarn made?
4. What do detergents do?
5. Why should you dry clothes well before st
6. How is silk made? Start with: The cocoon​

Answer 1

Answer:

• Animal fibers are natural fibers that consist largely of certain proteins. Examples include silk, hair/fur (including wool) and feathers. The animal fibers used most commonly both in the manufacturing world as well as by the hand spinners are wool from domestic sheep and silk.
• A cocoon is a casing spun of silk by many moths and caterpillars, and numerous other holometabolous insect larvae as a protective covering for the pupa.
• Threads are made by combining (twisting) fibres together, while yarn is made by twisting threads. This is a simple process, but an expensive one nonetheless; you have one end attached to the knitting needle or hold both ends together in a knitting machine and twist in one way or the other.
• Detergents are made from long molecules that contain a head and tail. These molecules are called surfactants; the diagram below represents a surfactant molecule. ... The detergent molecules also help to make the washing process more effective by reducing the surface tension of the water.
• Dry cleaners can remove many types of stains — even the ones you don't see — so getting your clothing professionally cleaned before putting them into storage prevents any existing stains from setting. It will also remove any unseen particles that can cause discoloration while in storage for months.
• Silk moths lay eggs on specially prepared paper. The eggs hatch and the caterpillars (silkworms) are fed fresh mulberry leaves. ... Harvested cocoons are then soaked in boiling water to soften the sericin holding the silk fibers together in a cocoon shape. The fibers are then unwound to produce a continuous thread.

Explanation:

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