Through the head’s transition from side to side in the cycle of a figure of eight, the silkworm totally covers itself, forming the cocoon. Fibroin consists of the sequence of long-chain amino acids Gly-Ser-Gly-Ala-Gly-Ala. The correct option is C. i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. India was growing the silkworm also shortly after 300 AD. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. It is mainly composed of fibroin. The silkworms secrete an excellent filament made of fibroin protein from 2 glands on its head, hardening after exposure to air, and becoming silk fibers. Furthermore, it forms beta-keratin. Which of the following makes silk fibres – (a) Larva (b) Adult silk moth (c) Pupa (d) None of the above iii. The silk thread is obtained from the cocoons of silk moth. Fibroin is … Nylon is a synthetic fibre. When the silkworms secrete t he . Fill in the blanks in the following statements. silk fibres. Question 11. The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. Silkworms secrete fibre made of GC Fibres Polymers Silkworms secrete fibre made of. The silk fiber protein is synthesized by silk . The silkworm has two modified salivary glands near its lower jaw called sericteries. This liquid is mostly made up of a type of protein called fibroin. fat; cellulose; protein; nylon; Answer. Fat and cellulose are not present in silk. Soon, the caterpillar covers itself with silk and forms a cocoon. Sericulture, the practice of making silk and raising silkworms (and your vocab word for the day) began in China around 3000 BCE. The secret to silk production may have reached Korea around 200 BC. During all these times they secrete fibre made up of protein which when comes in contact of air and it hardens to become a silk fibre. Solution: (c) Salivary gland of the silkworm secretes fibre made up of protein sericin and fibroin. "This finding could lead to the development of processing methods resulting in new high-strength and high-performance materials used for biomedical … The most commonly used silk is mulberry silk as silk moth feed on mulberry leaves. These silk-producing glands secrete a clear liquid that hardens into a thin silk thread when it comes into contact with air. Silk is a natural protein fiber produced by the larvae of certain specific insects like caterpillars of moths. The answer lies in how they control the silk protein solubility and structural organization in their glands. The silkmoth further develops in … (a) _____ and _____ fibres are obtained from animals. Silk protein consists of sericin and fibroin mainly. However, the secret of silk production did not reach the west (Europe) until 552 AD. Silk is made up of protein fibre, namely, 70% of fibroin (the filament) and 30% of sericin. There are … Very Short Answer Type Questions. liquid silk during the spinning, it ... made up of two brins. Bioengineers have discovered how spiders and silkworms are able to spin webs and cocoons made of incredibly strong fibers. About 550 AD Byzantine Emperor Justinian sent two monks on a mission of industrial espionage. Subsequently, it is converted into . The chief wife of the first Emperor of China is credited with accidentally discovering how to reel silk when a silkworm cocoon dropped from a tree into her cup of hot tea. Spider silk is a protein fibre spun by spiders.Spiders use their silk to make webs or other structures, which function as sticky nets to catch other animals, or as nests or cocoons to protect their offspring, or to wrap up prey. secrete fibres made of protein (fibrin) with their special silk glands. These silk fibres are obtained from cocoon stage. After this, the caterpillar completely covers itself by the fibre and turns into pupa. 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