Download App

Introduction to Biotechnology — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceIntroduction to Biotechnology3 Marks
Question
Sericulture
✓

Answer

  • Sericulture is the rearing of silkworms (moths) for production of silk.
  • Bombyx mori is the most commonly used variety of silkworm for this purpose.
  • The life cycle of silkworm consist of four stages namely egg, larva, pupa and adult.
  • Thousands of eggs deposited by female moths are incubated artificially to shorten the incubation period.
  • Larvae hatching out of eggs are released on mulberry plants.
  • Larvae are nourished by feeding on mulberry leaves.
  • After feeding for 3-4 days, larvae move to branches of mulberry plant.
  • The silk thread is formed from the secretion of their salivary glands.
  • Larvae spin this thread around themselves to form a cocoon. The cocoon may be spherical in nature.
  • Ten days before the pupa turns into an adult, all the cocoons are transferred into boiling water.
  • Due to the boiling water, the pupa dies in the cocoon and silk fibres become loose.
  • These fibres are unwound, processed and reeled. Various kinds of fabric is woven from silk threads.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following question." from Introduction to Biotechnology→Introduction to Biotechnology — all question types→Science STD 9 question papers→Maharashtra Board STD 9 question papers→Maharashtra Board question paper generator→

Similar questions

If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ….
→
Give the uses of dyes.
→
What is allotropy?
→
explain the statement : Fuse used in electrical circuit can save electrical objects from damage.
→
A $10\ cm$ long stick is kept horizontally in front of the concave mirror having focal length of $10\ cm$ in such a way that the end of the stick closest to the pole is at a distance of $20\ cm$. What will be the length of the image?
→
What is sintering?
→
Fill the following tables.
→
Why does this happen? (b) Fruits, flowers fall off after a certain period of time.
→
Explain the types of simple permanent tissues in plants.
→
Molecular formula – HN03
→