C. Answer the following questions in short:
1. What are the natural fibres?
2. Why wool regulates body's natural temperature?
3. Describe two properties of Angora and Cashmere.
4. What is sericulture?
5. Describe appearance and properties of silk fibre.
Answers
Answer:
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Explanation:
1)Natural fibres:
Natural fibers or natural fibres (see spelling differences) are fibers that are produced by plants, animals, and geological processes. They can be used as a component of composite materials, where the orientation of fibers impacts the properties. Natural fibers can also be matted into sheets to make paper or felt.
2)Wool is a heat regulator:
It regulates your body temperature the same way as it does on the sheep. As the body temperature rises the wool has the amazing ability to transfer heat and moisture along every fibre and release it into the cooler, drier environment, and when its cold it keeps the heat in.
3)properties of Angora and Cashmere:
Angora fibre is also distinct from cashmere, which comes from the cashmere goat. Angora is known for its softness, thin fibres, and what knitters refer to as a halo (fluffiness). It is also known for its silky texture. It is much warmer and lighter than wool due to the hollow core of the angora fibre.
4)sericulture:
Sericulture, also called silk farming, is the process of making silk fibers. It starts by raising silkworms and then processing the fibers they produce. ... The thread can then be twisted into silk yarn or woven into silk cloth (fabric).
5)Appearance and properties of silk fibre:
silk has good tensile strength,Silk is the strongest natural fibre and has moderate abrasion resistance. Silk has a liability and suppleness that, aided by its elasticity and resilience, gives it excellent drapability. Silk is a protein fibre and is a non-conductor of heat similar to that of wool.