Read ch3 fibre to fabrics of science ncert book and make a detailed project discussion the history ,the production,processing and varieties of silk and woll
Answers
Answer: Silk is a natural protein fiber produced by mulberry silkworm which is used for textile manufacturing. Silk fiber has a triangular prism-like structure which allows silk cloth to refract incoming light at different angles and with that to produce different colors. History of silk began in the 27th century BC in China where it remained in sole use until the commercial ways appeared from China to the Mediterranean Sea. There is also evidence of silk dating between 4000 and 3000 BCE. During the latter half of the first millennium BC, Silk Road opens and silk starts to spread the world. Cultivation of silk spread to Japan somewhere around 300 CE while by 522 the Byzantines managed to obtain silkworm eggs and were able to begin silkworm cultivation of their own. In time Chinese lost their secret to the Koreans and later the Indians.
Wool. Man can never match it. No other material, natural or man-made, has all its qualities. But man can refine and improve wool. He has done so by selective breeding of sheep and by incorporating in wool fabrics such qualities as shrink resistance, durable creasing and pleating, mothproofing, shower-proofing and stain-proofing.
Science and technology have kept wool in the forefront of fabrics, adapting to modern needs without impairing its virtues. Wool is part of Britain's history and heritage, more so than any other commodity ever produced in these islands. It was woven into cloth here in the Bronze Age which began about 1900 BC. But in historical terms this is comparatively recent. Elsewhere in the world, primitive man had domesticated the sheep in 10 000 BC.
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