4.
Name the most common silkworm.
5. What is sericin?
Answer the following questions in brief.
1. List three characteristics of wool fibres.
2. Name three animals of the camel family from which wool is obtained.
3. Does shearing cause a sheep any pain? Explain your answer
4. What is grading of wool?
5. How does a silkworm make its cocoon?
Answer the following questions in detail.
1. Describe the steps involved in the production of wool.
Answers
Answer:
I)
4)Bombyx Mori
The most common type of Silkworm – Bombyx Mori – have been farmed so heavily for the past 2,500 years – all over the world – that they can no longer be found in the wild.
5)Sericin is a protein that surrounds fibroin, which becomes silk. An ancient Chinese tradition was to drink a decoction of silkworm cocoons as a treatment for diabetes. ... Research indicated sericin as a major contributing factor.
II)
1)The characteristics of Wool fiber or protein fibers are as follows:
- They are composed of amino acids.
- They have excellent absorbency.
- Moisture regain is high.
2)Other than sheep, wool can be obtained from the animals like camels, goats and rabbits. The Alpaca, a camel breed, gives fibres which are light weight, soft and shiny in nature.
3)Cutting or shaving the wool off of a sheep is called shearing. Shearing doesn't usually hurt a sheep. It's just like getting a hair cut. However, shearing requires skill so that the sheep is shorn efficiently and quickly without causing cuts or injury to the sheep or shearer.
4)Grade refers to the relative diameter of the wool fibers (fineness) and should not be confused with quality and type. The three systems that describe wool grades in the United States are blood, numerical count and micron.
5)The silk used by humans comes from the domesticated silkworm, Bombyx mori. ... When a silkworm has eaten enough, it constructs a cocoon made out of silk fibers, and inside that cocoon it turns into a pupa. After many days, a fully formed adult silkworm moth emerges through a spit-soaked opening in the bottom of a cocoon.
III)
1)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.
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