The ducts of silk gland open at the end of a.mouth b.Anal end c.spinneret d.mouth parts
Answers
Answer:
d.mouth part
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Answer:
Option C Spinneret is the correct answer.
Explanation:
Insect silk is secreted by different types of glands. This chapter deals with silk produced by the labial glands of holometabolic (insects that have pupae in their life cycle). The lip silk gland consists of tens or hundreds of large polyploid cells that secrete polymeric proteins that are stored in the gland lumen as a semi-liquid gel. Polymerization is based on weak molecular intercourse between repetitive amino acid motifs present in one or more silk proteins. Cross-linking via disulfide bonds can be important in hydrospunsilk. The mechanisms of long-term storage of silk dopes in the gland and their conversion to silk fibers during spinning are not fully understood.
Transformation occurs within seconds at ambient temperature and pressure with minimal drag and partial submersion. Silk is mainly composed of a protein called fibroin, and in Lepidoptera and Lepidoptera it is covered with a glue-like protein called sericin. Silk often contains small amounts of additional proteins with little-known functions. Although the components of silk that control lubricant storage and filament formation appear to be conserved at the order level, the properties of the fibroin polymerization motifs that determine the physical properties of silk are also at the family level.
They also differ at the genus level. While most silks are based on fibroin β-sheets interrupted by other structures such as α-helices, certain sawfly silk proteins have predominantly collagen-like or polyglycine II sequences and are called social Hymenoptera. The silk of the eye is composed of proteins formed in a coiled-coil arrangement.
- The larvae feed on white mulberry, Osage orange, or lettuce leaves, although artificial diets have been developed for modern commercial operations.
- After 6 weeks, the silkworms stop feeding and spin cocoons.
- Larvae have a specially modified pair of salivary glands called silk glands.
- These glands secrete a clear, viscous fluid that is extruded through openings (called spinnerets) in the larval mouthparts.
- When the liquid is exposed to air, it solidifies and becomes silk.
- The diameter of the spinneret adjudicate the thickness of the silk thread produced.
- Each cocoon produces a silk thread about 900 meters long.
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