The moths are allowed to emerge from their cocoons to live out their full life cycle. Featured in. 3.18). The Silkworm, Bombyx mori produces the silk of commercial importance. Sericulture : Useful Notes on the Sericulture (383 Words), Structure of Silk Moth (With Diagram) | Zoology, Structure and Life Cycle of Cockroach (With Diagram). Another closeup view of a silkworm: 7. Fig. Then, The history of production of silk fibre is very interesting. Periods … Commercial silk is made by boiling the intact cocoons and unwinding the single silk strand onto reels. The female moth is bigger than the male and begins searching for a mate almost immediately after emerging from the cocoon. Share Your PDF File
Pro Lite, Vedantu The silkworm must be cared for from the time it hatches from an egg to the completion of the cocoon stage. We get wool from yak, sheep and goat etc. Welcome to BiologyDiscussion! The serial progressions of four distinct stages of development complete one generation of the species; egg (ova), larvae, pupa and imago. Sexual dimorphism is present in adult, pupal and larval stages of life cycle (Fig. In optimum conditions the eggs can hatch in a week or ten days. Silk is harvested by killing the silkworm pupa using heat. The life cycle of the silkworm and silk cloth production on a commercial basis is picturised in the given diagram. According to the first diagram, the life cycle of silkworm begins from 'laying eggs' stage and after 10 days, these eggs produce larvas. A small branch will most probably last a week and it takes 4 weeks for the silkworm to grow before it spins a cocoon. The silkworm takes three to seven days to prepare the cocoon, formed by about 20-39 concentric layers of a single thread. Other factors that influence the life cycle of the silkworms include exposure to sunlight and humidity. After both circles have been cut and colored, take the two circles and a brass fastener. Pro Lite, Vedantu Cocoon is the stage in which the larva spins silk threads around it, to protect itself from its predators. The larva traps itself inside the cocoon in order to pupate. They are a fun addition to your life cycle studies.
2020 life cycle of silkworm diagram