cocoon of silkworm diagram

This website is a great help for IELTS students. In the final stage, cocoons transform into moths after 16 days. The life cycle of the silkworm and silk cloth production on a commercial basis is picturized in the given diagram. I need your help. The single strand of silk that makes up a silkworm’s cocoon may be 300 to 900 meters long. Sometimes, two silkworms may build a cocoon together. And the silk yarn is obtained from the silk moth’s cocoon. Cocoon begins to form: 12. Each thread is of 300 to 900 meters long, and threads are dyed with desired colours either after twisting or weaving. These factories are called filature operations. Inspired by the silkworm’s ability to generate a 3D cocoon out of a single multi-property silk thread (1km in length), the overall geometry of the pavilion was created using an algorithm that assigns a single continuous thread across patches providing various degrees of density. I am also in need of someone who could give me a hand in correcting the essay I have written. The diagram shows the life cycle of silkworm moth. Silkworm eggs transform into the shape of silkworm larva after around 10 days. Some people think that these are harmful for our society and the government should ban them. This single strand of silk that the silk worm forms is about 1 mile long. The silkworms feed on the mulberry leaves which then rise to pupa. International English Language Testing System. Metamorphic changes of the pupa result in an emerging moth (fig. Changing of caterpillar into pupa. First of all, eggs are produced by the moth and it takes ten days for each egg to hatch and then silkworm larva emerges that feeds on mulberry leaves. Soln: Answer is (d) the process of taking silk threads from cocoon. During this stage, larvas basically eat the mulberry leaf. The twisting, dying, weaving and then dying again the process is done more than once as per necessary to produce fine quality silks. Many caterpillars form a protective layer around the pupa and this covering is termed as cocoon. 10. After 4 to 6 weeks, these larvas are transformed into silk thread and then silk threads to cocoon … With time the moths become grown-up and recycle the processes again. In this stage of silkworms, the growth happens. Thousands of new, high … Hello, we can work together to have a good band score. Others argue that such games and films are fine for entertainment. - The silkworms shed their skin up to four times, or molt, as they continue to eat and grow. Initially, the life cycle of silkworms starts with eggs which are laid by bees on the mulberry leaves. In this stage, silkworms spin a protective cocoon around itself. Stage 2: Silkworm. The second picture describes the processes of the silk cloth production which have more than 5 stages. By using our website and services, you agree to our use of cookies. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. I'm so pleased to have the chance to find your site with the help of my IELTS instructor. Muga moth (“Muga Polu’ in Assamese) also has the same life cycle as other silk­worms, i.e., egg, larva, pupa and adult. The eggs are covered with gelatinous secretion by which they stick to the leaves. Thanks K for your comment. I am a bit confused about the last stage of silk production - after weaving, the threads are dyed or dried. Turning to the life cycle, at first, adult female moths lay eggs on the surface of mulberry leaves at specific time and these eggs hatch in a period of 10 days. It is otherwise called “Bombyx” and produces silk. A material which is composed of thin and continuous strands is known as fibre. The lifecycle of the silkworm begins with a mature moth laying eggs on a mulberry leaf. Crucial stages involved in the life cycle of a silk worm and steps involved in the production of silk cloth are portrayed in the given charts. You took an elderly member of your family, who was not able to walk properly, to a museum and he/she faced a few problems. "IELTS Sample Answer & IELTS Preparation". Silk worm larvae emerge out of the eggs and feed on the mulberry leaves. After 8-10 days the eggs hatch producing silkworm larvae that feed on mulberry leaves. 10.Silkworms secrete fibre made of After the last main stage of the life cycle, it is transformed into cocoons, which is necessary to make a silk cloth. There are few notes outside the pictures too. Students-to-be are reading your sample answers, please make sure they are error-free. Then threads are twisted and dyed in dyers. Write at least 150 words. The silk used to make the cocoon starts out thick but gets thinner and thinner as the silkworm works its way into the center of the cocoon. The silkworm larva usually eats leaves like mulberry leaves and completes the second stage of the life cycle in 4-6 weeks. The life cycle of the silkworm takes around 70 days to complete. The process completes in 3-8 days when each larva becomes a ‘cocoon’. Inside the cocoon, the Silkworm will moult for the last time, as it approaches the last stage of its life-cycle to become a moth. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. As per the first diagram, eggs are laid on the mulberry leaves by adult moths at favorable conditions. Computer games and films containing violence are popular today. Generally, I do not read posts on blogs, but I would like to say that is a really good website I found for my IELTS Preparation. The first diagram shows that there are four main stages in the life of the silkworm. Silkworm is As you can see that there are some important points to note in this diagram. Write a letter to the manager of the museum. - The silkworms feed solely on large amounts of leaves from the mulberry tree for around 30-40 days. In the production of silk cloths, selected cocoons are boiled into the water. The caterpillar feeds on ber, oak, sal and fig plants. Silk is a type of natural fibre or animal fibre. 1. » You should spend about 20 minutes on this task. At least 70 million pounds of raw silk are produced each year, requiring nearly 10 billion cocoons. According to the first diagram, the life cycle of silkworm begins from 'laying eggs' stage and after 10 days, these eggs produce larvas. This website uses cookies to ensure that you get the best user experience on our website. An administrator is needed for this website to check and correct the essays posted. Discuss both views and give your opinion. The two given diagrams illustrate the life cycle of silkworms and show the processes of silk production. Silk materials have received much attention in recent years because of their attractive combinations of mechanical strength and toughness as well as the environmentally benign conditions under which the materials are processed from concentrated protein solutions to solid fibres [1]. Crime is a growing problem on a global scale. 9. The third stage begins when silk thread shells create cocoons, this process usually lasts for 3 to 8 days. Some important things are mentioned using a star sign. They feed on mulberry leaves and consume a large amount of these leaves for around 30 days before going to the next stage. Inside the finished cocoon: 16. You can't say "the given pictorials". Sometimes Silkworms do funny things, and this is evident when a Silkworm decides to spin a cocoon with a friend! Silkworm cocoons are natural polymer fibre composites made from silk fibres and sericin binder. The moth develops within the cocoon for about 10-14 days. Moth starting to emerge from the cocoon: 19. It is a continuous process. I have problems understanding where to begin my cycles and processes. This is the most desirable stage for the silk producers. The fibres which are obtained from plants and animals are known as natural fibres whereas synthetic fibres are man-made fibres. Hopefully, the review would be completed quite soon. You should spend about 20 minutes on this task. Finally, the wave is ready for dye process in any colour for the final production of silk clothes. The diagrams below show the life cycle of the silkworm and the stages in the production of silk cloth. While spending 3 weeks inside of the cocoon, they shed their skin and change into a pupa and then into moths. Two modified salivary glands, on the larva's head, produce a … As is presented in the first picture life cycle of silkworm begins with eggs laid by mother worm. The cocoon produced by this moth is hard and of hen’s egg size, which produces reelable brown coloured silk. Here, we describe in some detail the structure and morphology of the cocoons of 27 different species of silkworm. Some think that crime prevention rather than punishment is the key to solve the problem. (b) spinning of silk fibres. After that cocoon hatched and the moth is released, and it lay eggs again to start the cycle. I also use this website and I got 7 bands in my final test. In a period of 4 to 6 weeks, they start encapsulating themselves with the silk thread they produce. The process completes in 3-8 days when each larva becomes a ‘cocoon’. Fibre can be of two types: natural fibre and synthetic fibre. I was able to know a lot of information from this website. Food process lasts 4 to 6 weeks. Silkworm life cycle diagram Silkworm life cycle diagram illustration silkworm life cycle stock illustrations. It is reared on mulberry leaves. It is at this time that the cocoons are delivered to the factory by the farmer. After staying inside the cocoon for about 16 days, the larva transforms itself to a moth, breaks the cocoon, flies out and the cycle continues. Out of the following, which are the two terms related to silk production? She lays eggs on the leaves of mulberry trees. This moth is semi-domesticated and can be raised outdoor. Every picture has some notes on it. The diagram shows different stages in the production of silk cloth which starts from laying eggs and takes around 70 days. However, Yours,Roya Ataee. • When the silk worm forms a covering around itself by secreting a protein through its head, this is called the cocoon stage. Find silkworm stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. The cocoon is formed over a period of 3-6 days by synchronous extrusion of silk filaments. First of all, eggs are produced by the moth and it takes ten days for each egg to become a silkworm larva that feeds on mulberry leaves. The process of twist and dry, weave and dry possibly repeated if it is necessary to produce high-quality silk cloth. They have a lot of grammatical mistakes, I have never seen this on any other website with a similar context. Yet another inside view of the cocoon: 18. Why do you think this is happening? About 2,000 to 3,000 cocoons are required to make 1 pound of silk (0.4 kg). In pupa stage, a weave is netted around by the silkworm to hold itself. Finished cocoon: 15. Cocoons: The color of the cocoon depends on what silkworms eat, ranging from white to golden yellow. Inside the cocoon, the silkworm moults for the last time and begins the process of becoming a moth. To what extent do you agree or disagree?. Silk worms have to work in a figure 8 pattern in order to spin their cocoon around themselves. ADVERTISEMENTS: 2. 2. As is observed from the second picture, which describes the producing of silk cloth from silkworm, total stages of silk cloth production are five. It is then developed into silk thread within 4 to 6 weeks. Shells are unwinded properly and unwinded shells are exactly 300 to 900m long. The silk cocoon serves as protection for the pupa. Sample Answer 2: The two given pictures describe the life cycle of silkworm and also illustrate the procedure of silk cloth production. Reeling of silk is (a) a process of making silk reels. Tasar Silkworm (Anthereapaphia): It belongs to the family Saturniidae and common in India, china and Sri Lanka. - After their final molt, the silkworm builds a cocoon around itself. Inspired by the silkworm’s ability to generate a 3D cocoon out of a single multi-property silk thread (1km in length), the overall geometry of the pavilion was created using an algorithm that assigns a single continuous thread across patches providing various degrees of density. The cocoon stage lasts for around 16 days and they become moth in the final stage. Overall, it is clear that both the processes are closely related. In this case, the cocoon is noticeably larger. And finally, those silks are weaved and again dyed. Another view inside the cocoon: 17. Silkworm starting to spin a cocoon: 11. The female silkworm lays about 300 eggs at a time. (c) weaving of silk cloth. strong, soft and shining fibre produced by silkworms in making their Actually, we have already started the process. Eventually, it is then twisted which is helpful for making waves. Initially, in the first stage, silk thread shells are selected and boiled into hot water. It's used like - a pictorial encyclopaedia. Breeding and management of silkworms for obtaining silk is called as sericulture. The body is divisible into head, thorax and abdomen. In a period of 4 to 6 weeks, they start encapsulating themselves with the silk thread they produce. Examples of natural fibres are cotton and silk whereas examples of synthetic fibres are: nylon, polyester, etc. The first diagram shows that there are four main stages in the life of the silkworm. IELTS Academic Writing Task 1/ Graph Writing - Diagram/ A process: The diagrams below show the life cycle of the silkworm and the stages in the production of silk cloth. A silkworm constructs its cocoon from the outside in, starting with a quick scaffold that it can easily rest upon while weaving and that will ultimately secure the cocoon to surrounding plants. Life history: The moth is multivoltine the entire life cycle lasts for about 50 days in summer and 120 days in winter. While silk is an interesting natural material per se, an understanding of the role of silk within one of its main functional applications in silkworm cocoons will provide inspiration and tools for the design of new artificial silk composites. Hi,It's a very helpful website. The cocoon is a protective casing spun from silk. Sericulture, floriculture, moriculture, apiculture and silviculture. If you are interested, contact me via email at rechelporter35@gmail.com. The fibers are very fine and lustrous, about 10 μm (0.0004 in) in diameter. » Write at least 150 words. After a final molt inside the cocoon, the larva develops into the brown, chitin covered structure called the pupa. Spinning of cocoon of silk threads around caterpillar. eggs, larvae, and cocoons silkworm life cycle stock pictures, royalty-free photos & images ... Lifecycle of silk worm and larva, preserved in jars to display each instant or … Then these are twisted and dyed and finally, those are weaved to silks. Copyright © 2013 - 2021 IELTS Mentor. The illustration outlines the life cycle of a silkworm and the process of silk thread production. 3. Silkworms can take up to 48 hours to build a complete cocoon. Then the second process starts, and in this stage larva usually, eat leaves like mulberry leaves in order to grow up. It's really good to come to know about the way of writing. Learn more about our Cookie Policy & Privacy Policy. The life cycle of a silkworm begins from the eggs laid by the mother worm and from these eggs the silkworm larvae are generated after 10 days. I've just started my IELTS course and I sometimes find it too challenging to write task 1. All rights reserved. 8.14). Boil some intact cocoons in water for 5 minutes while repeatedly turning them over with a dissecting needle or similar instrument. Wrong explanation, it covers itself with silk thread and knows as the cocoon. The feeding continues for 30-40 days after which the silkworm larvae spin a cocoon around their bodies. All rights reserved. This stage lasts for up to six weeks until the larva produces a cocoon of silk thread around itself. The colour is creamish white, the antennae are short and plumose and mouth parts are of … This stage lasts for up to six weeks until the larva produces a cocoon of silk thread around itself. In some countries the quality of life in larger cities is declining. The complete life cycle of a silkworm is shown below: 7. Moth. Spinning the cocoon: 14. Moth half out of the cocoon: 20. (d) the process of taking silk threads from cocoon. A time lapse video showing silk worm building cocoon.© www.sandipde.comwww.facebook.com/sandipdephotography Very very very useful information. Similarly, there are four main steps in the production of silk cloth commencing with boiling into the water and ending with dying process. Overall, the life cycle of silkworm has four major stages which begin with eggs and end with cocoon. A hairy silkworm arises after the eggs crack. Silkworm makes messy poop: 13. Unwinding is in the second process in which 300 to 900 mm threads are produced. Thanks again for visiting our website. Sample Answer 1: The given pictorial show the life cycle of the silkworm and also shows the processes of silk cloth productions. It has a total of six stages. Cocoons are shades of white, cream and yellow depending on silkworm genetics. Larva generates silk threads shells at the end of the second stage. After this stage of the cycle, it becomes silkworm larva on mulberry leaves. Silk worm larvae emerge out of the eggs and feed on the mulberry leaves. ©2019 IELTS Training Tips . Model Answer 3: The diagrams illustrate the life cycle process of the silkworm as well as various steps in making of silk cloth. In a period of 10 days, the eggs hatch and silkworm larvae emerge. What measures can be taken to stop it? After boiling in water the threads are unwinded and they are usually 300 to 900 meter long. Stage 3: Cocoon. I'm impressed with the way of this explanation. Turning to the silk cloth production, superior quality cocoons are selected and boiled to unwind the silk thread. The cocoon is made of a thread of raw silk from 300 to about 900 m (1,000 to 3,000 ft) long. The abdomen is short and stout. The table below gives information about UK independent films. Since the adult’s emergence cuts the strand into pieces, silk is collected from intact cocoons with the pupae still inside. https://www.worldatlas.com/articles/how-is-silk-produced-from-silkworms.html Overall, it is clear that silk worms have a unique life cycle and the silk cloth production is systematic. Thanks to whoever has written this and it is really helpful for my science projects. 'Pictorial' is an adjective, not a noun. This process takes 4 … In the initial stage, the silk thread shells of the silkworm are selected and then boiled in the next stage. And moths grow up and recycle whole procedure step by step. In their third stage, they create silk thread shells and remain there for another 3 to 8 days and then create an oval cocoon.

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