Question

Answer the following questions in detail.
1. How are fibres classified? Give examples.
2. Explain how wool is processed. Write the steps in sequence with help of a diagram.
3. Explain life cycle of a silkworm with the help of a diagram.
4. Explain the process of obtaining silk from the cocoon.
5. How would you verify whether a silk dress bought by your mother is made from pure silk or artificial one?​

Answer 1

Answer:

Radical is a region which grows below the ground and gives rise to roots whereas plumule is a part of a seed that grows in above direction from ground. Plumule gives rise to other parts of plants such as stem, leaves and flowers.

Answer 2

Answer:

1 Natural fibres can be classified according to their origin. The vegetable, or cellulose-base, class includes such important fibres as cotton, flax, and jute. The animal, or protein-base, fibres include wool, mohair, and silk. An important fibre in the mineral class is asbestos.

2 The major steps necessary to process wool from the sheep to the fabric are: shearing, cleaning and scouring, grading and sorting, carding, spinning, weaving, and finishing.

3 The life cycle of silk moth starts when a female silk moth lays eggs. ... The silkworms feed on mulberry leaves and give rise to pupa. In the pupa stage, a weave is netted around by the silkworm to hold itself. After that it swings its head, spinning a fibre made of a protein and becomes a silk fibre.

4 The cocoons gathered and boiled or heated in ovens,to kill the insect inside them. The filaments are obtained from cocoons by proces known reeling or filature.it is done on special machines that unwind the threads of silk from the cocoons. The silk fibers are then spun into silk thread.

5 Silk can be identified by touching as rubbing silk can make you feel warm, unlike other synthetic replacements. You can pass a silk saree through a ring if it is of high quality. Silk has its own unique lusture, unlike other artificial ones. Nowadays pure silk comes with silk mark as a proof of its authenticity

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