2.Then, the spinning ofsilk fibres into threads is done. silkworms are really not worms at all. Science. Log in Join now Secondary School. This helps in separating out the silk fibres. There are many humane alternatives that can be used such as nylon, silk-cotton tree and ceiba tree filaments. Step 2: Thread extraction. 1. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. All contents provided by us are based on best of our knowledge. It is one of the important animal fibres obtained from silkworm. Last modified: Thursday, 3 January 2019, 11:18 PM. 1. Best Answer: Silk is the fiber that silkworms weave to produce cocoons. NCERT Class VII Science Chapter 3 Fibre to Fabric National Council of Educational Research and Training (NCERT) Book for Class VII Subject: Science Chapter: Chapter 3 – Fibre to Fabric Class VII NCERT Science Text Book Chapter 3 Fibre to Fabric is given below In Class VI you have learnt about some fibres obtained from plants. Silk fibres are then … The reference implementation is written in the C programming language. Processing of silk. Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers. Join now. Secondary School. Silk is separated from cocoon by exposing it to sunlight. Extracting silk from the cocoon is known as the processing of silk. Silk is the fiber that silkworms weave to produce cocoons. Explain the process of obtaining Silk from the cocoon - 5573521 1. Explain the process of obtaining silk Get the answers you need, now! Silk has set the standard in luxury fabrics for several millennia. Fibre to Fabric Class 7 Extra Questions Science Chapter 3 Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type Question 1. Step … Step 3: Dyeing. The study uses the Box–Behnken design in the optimization of experiments using RSM to understand the effect of important process variables and their interactions on the protein purification process. After that reeling of silk is done, the process of unwinding silk from a cocoon. Explain the process of obtaining silk from cocoon. The process by which silk thread is separated from the cocoon is called reeling the silk. Step 4: Spinning. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Log in. Secondary School. However, it is found that the fibre obtained from the larva of Bombyx mori is of commercial value. Skype Limited announced that SILK can use a sampling frequency of 8, 12, 16 or 24 kHz and a bit rate from 6 to 40 kbit/s. Science. Step 5: Weaving. As late as the 1950s, parts of the process were still done by hand, until it … Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. The various steps involved are: (i) Rearing of silkworms: A female silk moth lays hundreds of eggs at a time. Q41. Explain the process of obtaining silk from cocoon. Explain various steps involved in the process of making wool? Write a note on rearing silkworm. 1. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. You also learnt […] Science. The cocoons are kept under the sun or boiled or exposed to steam. Answer: Wool yielding animals are sheep, yak, llama, […] Silk fiber is then spun into silk threads. The process by which silk thread is separated from the cocoon is called reeling the silk. Silk is a natural protein fibre which can be used as a textile fibre. Sericulture, the production of raw silk by means of raising caterpillars (larvae), particularly those of the domesticated silkworm (Bombyx mori). Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. Here we have given NCERT Exemplar Class 7 Science Solutions Chapter 3 Fibre to Fabric. silk worms are the larvae of ‘bombyx mori’ moths and silkworms are actually domesticated insects. The process of obtaining silk fibre from Bombyx mori requires careful nourishment of the cocoons which is put through the spinning process. It was considered as one of the most valuable fibre at that time because of its luster and fine quality. Early on, slave labor picked and cleaned the cotton. There are many varieties of the silkworm from which the silk fibre can be obtained. Log in. Dye silk thread in a dye bath. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Log in. Step 4: Dyeing. Join now. Question 2. What do you know about discovery of silk? Ans. by ... Cocoon is treated with hot air, steam, or boiling water. Log in Join now 1. 6. NCERT Exemplar Class 7 Science Solutions Chapter 3 Fibre to Fabric Multiple Choice Questions Question 1. This helps in separating out the silkfibres. Name some wool yielding animals. A pile of cocoons is used for obtaining silk fibres. There are various stages to this process. The production of silk generally involves two processes: The silkworm caterpillar builds its cocoon by producing and surrounding itself with a long, Legend has it that a Chinese princess was sipping tea in her garden when a cocoon fell into her cup, and the hot tea loosened the long strand of silk.