Class 7 Science Chapter 3 Fibre to Fabric

Fibre to Fabric Class 7 Questions and Answers – Fibre to Fabric Class 7 Notes

Fibre to Fabric Class 7 Questions and Answers for students of Cbse / Icse Board

Q1 : You must be familiar with the following nursery rhymes:

  • ‘Baa baa black sheep, have you any wool.’
  • ‘Mary had a little lamb, whose fleece was white as snow.’ 

Answer the following:

  1. Which parts of the black sheep have wool?
  2. What is meant by the white fleece of the lamb?

Answer :

  1. Wool is obtained from the hair of the sheep.
  2. White fleece of the lamb refers to the white coloured hair of the lamb.

Q2 : The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.

  • a
  • b
  • both a and b
  • neither a nor b

Answer :             

both a and b

Q3 : Which of the following does not yield wool?

  • Yak
  • Camel
  • Goat
  • Woolly dog

Answer : Woolly dog

Q4 : What is meant by the following terms?

(i) Rearing (ii) Shearing (iii) Sericulture

Answer :

  1. Rearing is the process of raising, feeding, reproducing, and caring for useful animals.
  2. Shearing is the process of removing the sheep’s hair as well as a thin layer of skin.
  3. Sericulture is the practice of raising silkworms for the purpose of producing silk.

Q5 : 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,
  • picking of burrs,
  • dying of fibres,
  • making of yarn

Q7 :Out of the following, which are the two terms related to silk production?

Sericulture, floriculture, moriculture, apiculture and silviculture

Hints: Silk production involves cultivation of mulberry leaves and rearing silkworms.

Answer : Sericulture and moriculture

Q8 : Match the words of Column I with those given in Column II

Column I Column II 
(i) Scouring (a) Yields silk fibres
(ii) Mulberry leaves (b) Wool yielding animal
(iii) Yak (c) Food of silk worm
(iv) Cocoon (d) Reeling
(e) Cleaning sheared skin

Answers :- 1 – e  ,  2 – c , 3 – b , 4 – a

 

Class 7 Science Fiber to Fabric Extra Questions

 

Q. How many types of fibers are there?

There are 2 types of fibers

  • Natural fibers
  • Manmade fibers

 Q. What is natural fibers?

Natural fibers are obtained from plants and animals; such as jute, cotton, wool, silk, etc. Natural fibers can be classified into two types: Plant fiber and Animal fiber

Q. What is manmade fibers?

Fibers that are synthesized in laboratory are called manmade fiber.

Q. Name animals who has a thick coat of hair on their body?

Sheep goat camel yak

Q. What king of fibers do sheep’s have?

Sheep has two types of fibers that form its fleece:

  • the coarse beard hair, and
  • the fine soft under-hair close to the skin. The fine hair provides the fibers for Making wool.

 

Q. Which causes a fatal blood disease called sorter’s disease.

Anthrax

Q. Explain the life cycle of silkworm?

The silk moth is a type of insect (that looks like a butterfly). Because silk moths do not form directly from eggs, the life history of silk moth is quite interesting. An adult silk moth passes through two stages called larvae (also called caterpillars) and pupa before it can emerge from the egg.

Egg * Larva (or Caterpillar) * Pupa * Silk moth

The larva (or caterpillar) of a silk moth which produces silk is called silkworm.

Q. What is selective breeding?

The process of selecting parent sheep for obtaining special characteristics in their offspring (such as soft under-hair) is called ‘selective breeding’.

Q. What is Scouring?

The process of washing the fleece (cut hair of sheep) that removes dust, dirt, dried sweat and grease is called scouring

Q. What is sorting?

The process of separating the fleece of a sheep into sections according to the quality of woolen fibers (such as fine, coarse, long, short, etc.) Is called sorting

Class 7 Science Chapter 3 Fibre to Fabric – MCQ

 

 

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