NCERT Solutions for 7th Class Science: Chapter 3-Fibre to Fabric
NCERT Solutions for 7th Class Science: Chapter 3-Fibre to Fabric

Class 7: Science Chapter 3 solutions. Complete Class 7 Science Chapter 3 Notes.

NCERT Solutions for 7th Class Science: Chapter 3-Fibre to Fabric

NCERT 7th Science Chapter 3, class 7 Science Chapter 3 solutions

Page No: 32

Exercises

1. You must be familiar with the following nursery rhymes:
(i) ‘Baa baa black sheep, have you any wool.’
(ii) ‘Mary had a little lamb, whose fleece was white as snow.’

Answer the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?

Answer

(a) The hairy skin i.e. fleece of the black sheep have wool.

(b) White fleece means the white coloured hair of the lamb.

2. The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a 
(ii) b
(iii) both a and b
(iv) neither a nor b

Answer

► (iii) both a and b

3. Which of the following does not yield wool?
(i) Yak 
(ii) Camel 
(iii) Goat 
(iv) Woolly dog

Answer

► (iv) Woolly dog

4. What is meant by the following terms?
(i) Rearing
(ii) Shearing
(iii) Sericulture

Answer

(i) Rearing : It means taking care of herds of animals which includes feeding, grazing, breeding, etc. for economical purpose like meat and other useful products.

(ii) Shearing : The removal of fleece of the sheep along with a thin layer of skin from its body is called shearing.

(iii) Sericulture : The rearing of silkworms to obtain silk economically is called sericulture.

5. Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.
Shearing, __________, sorting, __________, __________, _________.

Answer

Shearing, scouring, sorting, burrs picking, dying, rolling

 6. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.

Answer

The two stages in the life history of the silk moth which are directly related to the production of silk:

Spinning of cocoon of silk threads around caterpillar.
Changing of caterpillar into pupa.

7. Out of the following, which are the two terms related to silk production?
         Sericulture, floriculture, moriculture, apiculture and silviculture.
Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.
           (ii) Scientific name of mulberry is Morus alba.

Answer

Sericulture and moricultur

8. Match the words of Column I with those given in Column II:

Column IColumn II
1. Scouring(a) Yields silk fibres
2. Mulberry leaves(b) Wool yielding animal
3. Yak(c) Food of silk worm
4. Cocoon(d) Reeling
(e) Cleaning sheared skin

Answer

Column IColumn II
1. Scouring(e) Cleaning sheared skin
2. Mulberry leaves(c) Food of silk worm
3. Yak(b) Wool yielding animal
4. Cocoon(a) Yields silk fibres

NCERT 7th Science Chapter 3, class 7 Science Chapter 3 solutions

Page No: 33

9. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down

(D) 1 : Thorough washing
       2 : Animal fibre
       3 : Long thread like structure
Across
(A) 1 : Keeps warm
       2 : Its leaves are eaten by silkworms
       3 : Hatches from egg of moth

NCERT Solutions for 7th Class Science: Chapter 3: Download PDF

NCERT Solutions for 7th Class Science: Chapter 3-Fibre to Fabric

Download PDF: NCERT Solutions for 7th Class Science: Chapter 3-Fibre to Fabric PDF

Chapter-wise NCERT Solutions Class 7 Science

Chapter 1 Nutrition in Plants
Chapter 2 Nutrition in Animals
Chapter 3 Fibre to Fabric
Chapter 4 Heat
Chapter 5 Acids, Bases and Salts
Chapter 6 Physical and Chemical Changes
Chapter 7 Weather, Climate and Adaptations of Animals to Climate
Chapter 8 Winds, Storms and Cyclones
Chapter 9 Soil
Chapter 10 Respiration in Organisms
Chapter 11 Transportation in Animals and Plants
Chapter 12 Reproduction in Plants
Chapter 13 Motion and Time
Chapter 14 Electric Current and Its Effects
Chapter 15 Light
Chapter 16 Water: A Precious Resource
Chapter 17 Forests: Our Lifeline
Chapter 18 Wastewater Story


About NCERT

The National Council of Educational Research and Training is an autonomous organization of the Government of India which was established in 1961 as a literary, scientific, and charitable Society under the Societies Registration Act. Its headquarters are located at Sri Aurbindo Marg in New Delhi. Visit the Official NCERT website to learn more.