Fibre to Fabric Class 7 Worksheet Science

Q.1. True/False
(i) The fur (hair) on the body of camels is also used as wool. 

True

(ii) Caterpillars should be collected with bare hands. 

False

(iii) Weavers weave silk threads into silk cloth. 

True

(iv) For obtaining silk, moths are reared and their cocoons are collected to get silk threads.

True

(v) A female silk moth lays one egg at a time.

False

Q.2. Fill in the blanks.
(i) Wool is obtained from the ____ of sheep or yak.

fleece (hair)

(ii) Silk fibres come from ____ of the silk moth.

cocoons

(iii) Yak wool is common in ____ and ____.

Tibet, Ladakh

(iv) Silk fibres are made of a ____.

protein

(v) ____ and ____, found in South America, also yield wool.

Llama, Alpaca

Q.3. What is meant by the white fleece of the lamb?

The white fleece of the lamb means white color hairy skin.

Q.4. What is the scientific name of mulberry?

Scientific name of mulberry is Morus alba.

Q.5. Name some animals which give us wool.

Sheep, goat and yak

Q.6. Is silk a good conductor of heat?

Silk is a protein fibre and is a non-conductor of heat.

Q.7. Name some Indian breed of sheep.

Lohi, Rampur bushair, Nali, Bakharwal, Marwari and Patanwadi

Q.8. Define spinning.

The process of making yarn from fibres is called spinning.

Q.9. What do you understand by wool?

Wool is a fibre obtained from sheep, goat, yak and some other animals.

Q.10. Which leads the world in silk production?

China leads the world in silk production.

Q.11. What do you mean by yarn?

Yarn is a long continuous thread that is made up of fibre.

Q.12. What are the different types of silk?

Mulberry silk, tassar silk, eri silk, mooga silk, etc.

Q.13. What is the most common silk moth?

The most common silk moth is the mulberry silk moth.

Q.14. What do you mean by occupational hazards?

Risks faced by workers in any industry are called occupational hazards.

Q.15. Where does angora wool come from?

Angora wool is obtained from angora goats, found in hilly regions such as Jammu and Kashmir.

Q.16. What is weaving?

Weaving is the process of arranging two sets of yarns together to make a fabric.

Q.17. What is called reeling the silk?

The process of taking out threads from the cocoon for use as silk is called reeling the silk.

Q.18. What is cocoon?

The caterpillar completely covers itself by silk fibres and turns into pupa. This covering is known as cocoon.

Q.19. What are silkworms?

The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms.

Q.20. What is Rearing?

Rearing of animal includes day-to-day care, selective breeding and the raising of animal.