Silk production is a lengthy process that requires close monitoring. The Silk Moth Life Cycle. Life Cycle of Silk Moth The female silk moth lays about 300 to 400 eggs at a time. Heat and its Effect. After the eggs hatch, the caterpillars are fed a diet of mulberry leaves in a controlled environment. Back to Home Page. Multiple-choice Questions: In liquids, heat transfer takes place by (a) radiation (b) conduction (c) convection (d) none of these. Silk reeling is the process by which a number of cocoon baves are reeled together to produce a single thread. Step 7: Real-time quality control The eggs hatch and the caterpillars or silkworms emerge. The two given pictures describe the life cycle of silkworm and also illustrate the procedure of silk cloth production. . Ans: Sericulture, or silk farming, is the rearing of silkworms for the production of raw silk. In the pure-dye process, the silk is colored with dye, and may be finished with water-soluble substances such as starch, glue, sugar, or gelatin. Silk was even used as money during some Ancient Chinese dynasties. As soon as the caterpillar gets ready to develop into pupa, it first weaves a net to hold itself and swings its head from side to side in the form of the figure of eight (8). NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination. Silk is only natural fiber which is found in filament form. Silk is an animal fiber and it is also called protein fiber. PROCESSING OF SILK The process of obtaining silk from silk moth involves- 1) rearing of silkworms 2) reeling and 3) dyeing. Karnataka State Syllabus Class 7 Science Chapter 3 Fibre to Fabric Class 7 Science Fibre to Fabric NCERT Textbook Questions and Answers. The next step is reeling or filature. Life history of silk moth The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms . The female silk moth lays eggs. Their body weight increases substantially. Sericulture, or silk farming, is the cultivation of silkworms to produce silk.Although there are several commercial species of silkworms, Bombyx mori (the caterpillar of the domestic silkmoth) is the most widely used and intensively studied silkworm. Extracting silk from the cocoon is known as the processing of silk. Shearing is done with a manual […] Wool is the soft, wavy (or curly) hair which covers the body of a sheep. All the questions of this chapter are important for school tests and exams. The larvae also known as caterpillar or silkworm hatches out from the egg and grows in size. The filaments are made of […] Do you know where do we get wool? To produce weighted silk, metallic substances are added to the fabric during the dying process. Bar Chart; Line Graph; Pie Chart ; Table; Progressive Bar Chart; Map; Process Diagram; You could also get a combination of these and be asked to compare them. Question 1. asked Jan 22, 2018 in Science by Rohit Singh (64.2k points) Describe the life history of silk moth with the help of figures of various stages. Describe the life history of silk moth with the help of figures of various stages. Apply some humor. From Sheep to Wool – Step by Step Process for Wool Production The different processes involved in wool production are shearing, scouring, grading, dyeing, and drying. It is a good way to hook your audience. 2.6k views. is called scouring Step 3: sorting The process of separating the long fine quality fleece from the remaining inferior quality or broken pieces is called sorting. Class 7 Chemistry Fibre to Fabric: Life cycle of silkworm : Life cycle of silkworm. ... Steps involved in silk production are as follows: The first step is to collect the cocoons and kill the insect inside them. Do not try to impress your don or tutor. As is presented in the first picture life cycle of silkworm begins with eggs laid by mother worm. Processing of cocoon to silk; Class 7 Chemistry Fibre to Fabric: Processing fibres into wool: Processing fibres into wool. Question from very important topics are covered by NCERT Exemplar Class 7.You also get idea about the type of questions and method to answer in your Class 7th examination. Silk was an important part of China's economy; entire villages would engage in the production of silk, or sericulture, and they could live off the profits of their labors for much of the year. The pupa after metamorphosing into adult moth comes out by piercing open the cocoon. Share; Like; Download ... Ravi Prakash, Student at aiet, jaipur. Silk thread is then bleached. Among them mulberry silk is the most important and contributes as much as 90 per cent of world production, therefore, the term "silk" in general refers to the silk of the mulberry silkworm.
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