Class 7 ncrt science book assignment questions
Q.1 Write any two properties of silk.
Q.2 Name any four types of silk.
Q.3 Define sericulture.
Q.4 Where was the silk first discovered?
Q.5 Name any three major silk producing states in India.
Answers
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Answer:
Answer 1
- Low density makes for light and comfortable clothing.
- High resistance to deformation.
Answer 2
- Mulberry silk
- Eri silk
- Tasar silk
- Muga silk
Answer 3
- Sericulture is the process of cultivating silkworms and extracting silk from them. The caterpillars of the domestic silk moth (also called 'Bombyx mori') are the most commonly used silkworm species in sericulture.
Answer 4
- The earliest evidence of silk was found at the sites of Yangshao culture in Xia County, Shanxi, where a silk cocoon was found cut in half by a sharp knife, dating back to between 4000 and 3000 BC. The species was identified as Bombyx mori, the domesticated silkworm.
Answer 5
- Karnataka
- Andhra Pradesh
- Assam
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