Write various steps for processing fibres into wool. The domestic silk moth derives from Chinese rather than Japanese or Korean stock. This covering is known as cocoon. The silkworm is one of the few organisms wherein the principles of genetics and breeding were applied to harvest maximum output. Which of the following is not a type of silk? Explanation: A salivary gland of silkworm releases a protein which is used as silk. 11. Step V: The fibres can be dyed in various colours, as the natural fleece of sheep and goats is black, brown or white. (c) making silk fabric from silk yarn. Many hundreds of strains are maintained, and over 400 Mendelian mutations have been described. Moth mainly used in the production of silk, "Silkworm" redirects here. Silkworms were first domesticated in China over 5,000 years ago. History of Mulberry Silkworm: Bombyx mori is popularly called the Chinese silkworm or Mulberry silkworm â¦ The cocoon is made of a thread of raw silk from 300 to about 900 m (1,000 to 3,000 ft) long. 13. Silk is obtained after killing silkworm, Animal fur cap is obtained from fur which requires the killing of an animal. (d) the process of taking silk threads from the cocoon. 16. Paheli went to the market to buy sarees for her mother. Silk is a natural protein fiber, some forms of which can be woven into textiles.The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Algae based fibre 4. Health is dependent on factors such as better pupation rate, fewer dead larvae in the mountage, shorter larval duration (this lessens the chance of infection) and bluish-tinged fifth-instar larvae (which are healthier than the reddish-brown ones). (b) rearing of silkworm. Give a reason for your answer. (c) washing of sheep fibre to remove grease. Sarah Underhill Wisseman, Wendell S. Williams. It is the closest relative of Bombyx mandarina, the wild silk moth. As the process of harvesting the silk from the cocoon kills the larva, sericulture has been criticized by animal welfare and rights activists. fat; cellulose; protein; nylon; Answer. Collagen fibre 6. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene. Cotton fibre is the purest source of cellulose and the most significant natural fibre. Hence, based on making of fabric from fibre it is said that unity is strength. It is second only to maize in exploiting the principles of heterosis and crossbreeding. These questions help you in practising different kinds of questions that can be asked on a specific topic. Production of sarees. A thread which burns with the smell of burning paper is of cotton because both paper and cotton are cellulose which is carbohydrate and hence they burn with similar odour. PLA Fibre ( Poly-Lactic acid fibre) It is one of the important animal fibres obtained from silkworm. Rearing of silkworm.  One example of this was the molecular identification of the first known pheromone, bombykol, which required extracts from 500,000 individuals, due to the very small quantities of pheromone produced by any individual silkworm. (c) The rearing of silkworms for obtaining silk is called silviculture. The domestic silk moth was domesticated from the wild silk moth Bombyx mandarina, which has a range from northern India to northern China, Korea, Japan, and the far eastern regions of Russia. Obtained from wool which does not require the killing of animals. BYJU’S is India’s top online education providers with countries top teachers on its board. Question 9: Reeling of silk is. 9. 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