For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. Answer (c) Very Short Answer Questions . Lakhmir Singh s Science is a series of books which conforms to the NCERT syllabus. The main aim of writing this series is to help students understand difficult scientific concepts in a simple manner in easy language. These threads are very fine & strong. Found inside – Page 52After the cocoons have been sorted and prepared , a handful is placed in the basin , and the water heated till they are sufficiently softened ; they ... Can labor sufficiently cheap be obtained ? that is , as regards the rearing of the silkworms . ... The Pennsylvania experiment , above narrated , is a nearly conclusive answer to the first and third questions . ... a successful but a long - time friend ; one of the few men who understood Mr. Forrest practice in the execution of the simple exercises ... The two-volume Handbook of natural fibres is an indispensible tool in understanding the diverse properties and applications of these important materials. The threads are obtained from the cocoons that protect the insect during it's pupa stage. Silk reeling is the process by which a number of cocoon baves are reeled together to produce a single thread. Attempts had been made to develop a U.S. silk industry since the early 1600s. The process of taking out threads from the cocoon for use as silk is called “reeling of silk”. The leftover silk may include the brushed ends or broken cocoons. 10. Found inside – Page 16... and Dyeing Processes There are Three General Groups of Materials to Consider — Alkaline Solution or Materials — Materials of an Acid Character , and Solutions and ... But the matter of practically common silk fibre is practically continuous , varying knowledge that silk is a fibre obtained from in length from 400 to 1,300 yards . the cocoon spun by the silk - worm , so we In its fineness , that is to say , the ... Answer: Wool – silk fibre is obtained from the cocoon of silkworm. Sericulture is the art of rearing silk worms under artificial or domesticated conditions and extraction of the silk fiber from their cocoon. Extended Learning—Activity and Projects – Question 1: Paheli wants to know the maximum length of continuous silk thread that can be obtained from a cocoon. 6. Found insideThe Matter of History links the history of people with the history of things through a bold new materialist theory of the past. Moth is a type of insect. (a) moth (b) larvae (c) pupa (d) cocoon√ B. Found inside – Page 179There was also a treatment for preserving manuscripts called liquid silk obtained from the cocoon of the silk worm . ... Let us remember how simple their means were and how wisely they were able to use all that “ nature ” put at their disposal . Silk is obtained from cocoons of silkworm. 2. Silkworms arc caterpillars of silk moth. Answer: The silk yarn is obtained from the cocoon of the silk moth. Found inside – Page 276... 6 x 1/2 = 3 (i) The silk yarn is obtained from the cocoon of the silk moth. ... Answer the following questions: 3 × 1 = 3 (a) Who discovered the ... This shorter staple silk may be used for spinning silk in a manner of fabrics like cotton and linen. Very short answer : Question 1. A type of fibre that is naturally obtained from a cocoon. 3. 3. b) 5 short questi … on answers (2 mark each). Down: 5. 5. This conversation is already closed by Expert Was this answer helpful? ... How do I study for a short answer exam? Natural fibres are obtained from plants and animals. a. Silk is obtained from the silk moth. larval phase is prolonged, silk is thick, of short length and are better adapted in unfavourable conditions. Explain the process of spinning. How is silk obtained from cocoon? Amidst the awareness that silk production is a cruel process, there are claims that some silk is—Ahimsa Silk or Ahimsa Peace Silk. Question 10. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). 7. The methodology of sericulture includes five steps: 1. The eggs are warmed to a suitable temperature for the larvae to … Why is a cocoon that produces a live silk moth useless for making silk cloth? The silk fibres are separate out. Cocoons are collected and boiled in water. In conventional silk production, a silk worms lifespan is cut short by immersing the cocoons in boiling water, thereby destroying the pupa inside. Answer: Natural Forbes – Those fibers which are obtained from plants and animals are called natural fibers. The silk fibres separate out. Question: Where does a female silk moth lay eggs? The quality of spun silk is slightly inferior to reeled silk in that it is a bit weaker and it tends to become fuzzy. Found insideThis book is a systematic and concise resource useful to anyone involved with or looking to move into aquaculture and fisheries. How is silk obtained from them? (d) the process of taking silk threads from the cocoon. Collection of eggs - The ripened cocoons are collected and adult moths are allowed to come out of them and mate. VERY SHORT ANSWER (1M): 1.What are fibres? 4. The most A polymer used for making rope. This kills the pupae inside the cocoons and helps in separating the silk fibres. Question: Name the domesticated moth whose larva produces silk. Silk yarns come from the cocoon of the silkworm. The process of taking out threads from the cocoon for use as silk is called “reeling of silk”. Found insideReveals how commodity failure, as much as success, can shed light on aspirations, environment, and economic life in colonial societies. Answer: The silk yam is obtained from the cocoon of the silk moth. (a) _____ and _____ fibres are obtained from animals. They are soft, light in weight and strong. Alpaca is generally found in South America. Describes the physical characteristics, behavior, and life cycle of the silkworm moth, and how its cocoon is used to make silk. Question 12: State whether the following statements arc True or False. Q4: Define a fibre. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. (of an animal) care for (its young) until they are fully grown. Answer: Procedure to obtain silk yarns from silkworms: 1. [Hint: Production of raw silk by raising silkworms is called sericulture.] Found inside – Page 30Answer. Type. Questions-I. Short Answer Type Questions-II Q. 1. ... Explain the process to obtain silk thread from Cocoon. Ans. Cocoons of silk moth are ... Answer-Eggs of silk moth are stored carefully on strips of cloth or paper and sold to silkworm farmers.The farmers keep eggs under hygienic conditions, under suitable temperature and humidity. Silk fibres are obtained from the cocoons of the silk moth or silkworm. Question 12. Like agriculture, sericulture, as an industry, requires greater development in research and technology aimed at increased production. This text covers the complete range of subjects with current data relating to mulberry and silkworm. 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. Hope the information shed above regarding NCERT MCQ Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers Pdf free download has been useful to an extent. Silk made from entire cocoons, as distinguished from lower-quality silk made by spinning short fibres obtained from broken cocoons and other silk waste. (f) Cocoons are kept under the sun or boiled in water. Wool is obtained from hairs of sheep, yak, camel, goat etc. The cocoons are kept under the sun or boiled or exposed to steam. Answer: For obtaining silk, moths are reared and their cocoons are collected to get silk threads. Other animals such as ants, wasps, bees, beetles, leafhoppers, flies, and spiders also suffer in the silk industry. How is silk processed? Terry cot; 7. The larva traps itself inside the cocoon in order to pupate. After that it swings its head, spinning a fibre made of a protein and becomes a silk fibre. What is the chemical name of the polymers that make up cotton? Fill in the blanks: 1. The thickness of silk filament yarn is expressed in terms of denier, the number of grams of weight per 9,000 metres (9,846 yards) of length. Found inside – Page 716( - ) Fine close silk ; con versc 編 silk of various colours . ... [ 1 ] The coarser part of the silk obtained from the cocoon , it is unfit for beiug ... Answer is (c) cocoon Explanation: Silk is a fibre obtained from the cocoons of silkworms. The rearing of silkworms for obtaining silk is called sericulture. Then the silk fiber is unwounded from the cocoons. View Answer. The book is written in an easy to read and understandable style. In a straight forward, no nonsense fashion, Elliott Lang covers all aspects of making silk at home. The book is full of sound advice and answers to your questions. Correct answer - Approximate length of a single thread sepatated from cocoon - eanswersin.com Both a and b. Q5: Name the place where Angora goats are found in plenty. rearing: def of rearing as in animal husbandry. Wool fibre cannot be obtained from which of the following? 6. Rayon; Down. [ The fibres obtained from natural sources are called as natural fibres. Several caterpillars form a protective layer around pupa and this covering is known as the cocoon. Explanation: ... 10 very short question answers (1 mark each). In conventional silk production, a silk worms lifespan is cut short by immersing the cocoons in boiling water, thereby destroying the pupa inside. larval phase is prolonged, silk is thick, of short length and are better adapted in unfavourable conditions. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork. b) Why are cocoons boiled in water to obtain silk? Mulberry leaves. (a) Goat (b) Llama (c) Alpaca (d) Moth Soln: Answer is (d) Moth Explanation: Wool can be obtained from animals like sheep, goat, camel, yak, rabbit etc. Explain the process of obtaining silk from cocoon. Some of the different silk fibres are tassar silk, mooga silk, Kosa silk, etc. A pound of silk takes 3,000 cocoons. IX. It requires about 3,000 cocoons to produce one pound of silk. Because the process of extracting silk from the cocoon involves the killing of the larva, sericulture has attracted criticism from animal rights activists. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. Silk fiber is obtained from option 1. fleece of sheep 2. cotton ball ... 3. cocoon. Define: (a) Shearing (b) Scouring (c) Sorting 9. Short Answer Type Questions. Answers to the questions given in the Let’s Exercise ... Answer the following questions in short. (d) the process of taking silk threads from cocoon. Found insideFor the student, researcher, and naturalist, here is practical information on collecting, rearing, and conducting original research. The entire text is referenced to an extensive bibliography. (Hint: They are long, thin, flexible thread like structures used to make yarn) 2. There are about 20 sets of MCQ tests, each test containing 5 questions with answers and explanation of answers updated for new academy session 2021-22. reeling: reeled silk. The silk used to make tissue is obtained from the cocoon produced by silkworms, in most of cases the species Bombyx mori. Ans: Fibres are classified into two types on the basis of their sources. Thus, tassar silk, mooga silk, kosa silk, etc are obtained from cocoons spun by … Found insideShort of finding genuine whalebones in Stefani's corsetry I couldn't ... Silk is obtained from the cocoons of the domesticated silk moth, the Bombyx mori. Q3: Name some animals which provide us with wool. There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in textures (coarse, smooth, shiny, etc.) View Answer. It will take 3,000 cocoon s to make just 1 pound of this type of silk. Found inside – Page 19Cotton is a plant product whereas the silk obtained from the cocoon of a silkworm, ... Glucose is a source of instant energy because it is quick to act to ... Found insideThis new edition is updated and expanded to include the very latest developments in silk production. The silk fibres separate out. This book examines how material culture can enhance historians' understanding of the past, both worldwide and across time. Answer: Silk is obtained from the cocoon of the pupa of mulberry silk moth. 7. Wool fibre cannot be obtained from which of the following? Found insideThis book is a valuable resource for researchers, scientists and advanced students interested in biomaterials science, chemistry, molecular biology and nanotechnology. Silk is also made by a variety of other insects that undergo metamorphosis and some insects such as spiders that are web spinners. Solution: (c) The breeding and management of silkworms for the production of silk is known as sericulture. The larva of a silk worm feeds on mulberry leaves and secretes fine threads of silk. Soln: The answer is (c) protein. Now, some very interesting facts about raw silk, It takes about 10 kg of cocoons to obtain 1 kg of silk. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture. Find out for her. Answer is (c) cocoon Explanation: Silk is a fibre obtained from the cocoons of silkworms. Silk is the filament a silkworm produces for its cocoon. Answer: A pile of cocoons is used for obtaining silk fibres. Silk fibres come from cocoons of silk moth. Found inside – Page 827Waste silk is silk obtained from cocoons in any way soiled or unable to produce a continuous thread ; also the extreme outer and inner portions of every ... Of letters in the Let ’ s cocoon used for the larvae to form cocoons soap and.. 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