NCERT Class VII Science Solution: Chapter 3-Fibre to Fabric Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for CBSE/Class-7 Science: fully solved questions with step-by-step explanation- practice your way to success.

Question 18:

Write a caption for each of the figures given as Figure (A - D) .

Result for Eggs of Silk Moth on Mulberry Leaves
Result for Silkworm
Result for Cocoon
Result for Cocoon with Developing Moth

Answer:

  1. Eggs of silk moth on mulberry leaves
  2. Silkworm
  3. Cocoon
  4. Cocoon with developing moth

Question 19:

Steps for the production of silk are given below in a jumbled order. Arrange them in their proper sequence.

  1. Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
  2. Fibers arc taken out from the cocoon.
  3. After 25 to 30 days, the caterpillars stop eating and start spinning cocoons.
  4. The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
  5. Female silk moths lay eggs.
  6. Cocoons arc kept under the sun or boiled in water.

Answer:

Correct order - (E) , (A) , (D) , (C) , (F) , (B)

Question 20:

A wholesale woolen fibre dealer gets the woolen fibre of different textures sorted for various purposes. Match the items in Column I with the woolen fibre in Column II.

Match the Column I and Column II. (Q)
Column IColumn II
  1. Pashmina shawl
  • Camel wool
  • Woolen carpet
  • Angora wool
  • Baby blanket
  • Kashmir goat
  • Woolen sweater
  • Sheep wool

Answer:

Match the Column I and Column II. (A)
Column IColumn II
  1. Pashmina shawl
iii Kashmir goat
  1. Woolen carpet
i Camel wool
  1. Baby blanket
ii Angora wool
  1. Woolen sweater
iv Sheep wool