Join now. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. Q41. Log in Join now Secondary School. Explain various steps involved in the process of making wool? Step 2: Thread extraction. Question 2. 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. 5. The reference implementation is written in the C programming language. The production of silk generally involves two processes: The silkworm caterpillar builds its cocoon by producing and surrounding itself with a long, Last modified: Thursday, 3 January 2019, 11:18 PM. by ... Cocoon is treated with hot air, steam, or boiling water. Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. However, it is found that the fibre obtained from the larva of Bombyx mori is of commercial value. Best Answer: Silk is the fiber that silkworms weave to produce cocoons. The process of obtaining silk involves boiling silk cocoons for twenty minutes, until they are soft and opened out. NCERT Exemplar Class 7 Science Solutions Chapter 3 Fibre to Fabric Multiple Choice Questions Question 1. What do you know about discovery of silk? 1. Dye silk thread in a dye bath. Join now. After that reeling of silk is done, the process of unwinding silk from a cocoon. 1. 6. Patanwadi . The codec technology is based on linear predictive coding (LPC). Step 5: Weaving. Reel silk threads from several cocoons together on a wooden spindle into a uniform strand of raw silk. of process variables used in the present work, by using the 10 g silk cocoon as a starting material. Ans. Sericulture, the production of raw silk by means of raising caterpillars (larvae), particularly those of the domesticated silkworm (Bombyx mori). It can also use a low algorithmic delay of 25 ms (20 ms frame size + 5 ms look-ahead). Marwari . There are various stages to this process. The process variables used Step 4: Spinning. Secondary School. There are many humane alternatives that can be used such as nylon, silk-cotton tree and ceiba tree filaments. 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. Log in. Log in. Silk is the fiber that silkworms weave to produce cocoons. Silk has set the standard in luxury fabrics for several millennia. It's hard to imagine the numerous steps of the manufacturing process ever being done by hand. It is at this time that the cocoons are delivered to the factory by the farmer. The process of taking out threads from the cocoon for use as silk is called reeling the silk. NCERT Exemplar Class 7 Science Chapter 3 Fibre to Fabric are part of NCERT Exemplar Class 7 Science. Silk fibres are then … All contents provided by us are based on best of our knowledge. Later, itinerant pickers and sharecroppers handled the tasks. 2.Then, the spinning ofsilk fibres into threads is done. 1. Q42. 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. The various steps involved are: (i) Rearing of silkworms: A female silk moth lays hundreds of eggs at a time. Q44. Science. Log in Join now 1. Extracting silk from the cocoon is known as the processing of silk. This helps in separating out the silkfibres. The process by which silk thread is separated from the cocoon is called reeling the silk. Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. Write a note on rearing silkworm. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Explain the process of obtaining silk from cocoon. The process by which silk thread is separated from the cocoon is called reeling the silk. Explain the process of obtaining silk from cocoon. Here we have given NCERT Exemplar Class 7 Science Solutions Chapter 3 Fibre to Fabric. They include: • When the silk worm forms a covering around itself by secreting a protein through its head, this is called the cocoon stage. Step 5: Spinning. Explain the process of obtaining Silk from the cocoon - 5573521 1. Name the sources of obtaining fibres. Explain the process of obtaining silk from the cocoon Get the answers you need, now! Step 3: Dyeing. Silk is separated from cocoon by exposing it to sunlight. The silk fibres separate out.

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