ncert solution for class 7th science l-3 fibre to fabric extra question, fill in the blanks and true or false.
Answers
Answer:
i dont know
Explanation:
Answer:
L-3 Fibre to Fabric
Extra Questions
Name the sources of obtaining fibres.
Answer:
The sources of obtaining fibres are plants and animals.
Question 2.
Name some wool yielding animals.
Answer:
Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel.
Question 3.
in which part of India, yak wool is common?
Answer:
Yak wool is common in the hilly regions of Ladakh.
Question 4.
Rampur bushair and Bakharwal are the breeds of which animal-sheep or goat?
Answer:
Rampur bushair and Bakharwal are the breeds of sheep.
Question 5.
How do the hair of certain animals help in keeping their bodies warm? [NCERT Exemplar]
Answer:
Hair traps a lot of air which is a poor conductor of heat resulting their body warm.
Question 6.
Write the name of the animal from which wool for pashmina shawls is obtained.
Answer:
Kashmiri goats.
Question 7.
Name the goats which are found in Tibet and Ladakh.
Answer:
In Tibet and Ladakh, angora goats are found.
Question 8.
wool is obtained from which body part of sheep?
Answer:
Wool is obtained from the fleece or hair of sheep.
Question 9.
Name the natural fibre obtained from insects.
Answer:
Silk.
Question 10.
In which part, the wool yielding animals liama and alpaca are found?
Answer:
Liama and alpaca are found in South America.
Fill in the blanks
1. Selective breeding is the process of the crossing of two selected varieties having different traits to produce a hybrid having good traits of both, e.g., some breeds of sheep possess only soft under-hair.
2. Breeding and management of silkworms for obtaining silk are called sericulture.
3. Silk and Wool fibres are obtained from animals.
4. Wool yielding animals bear hair on their body.
5. Silk fibres come from cocoons of the silk moth.
True and False
1. (a) Silkworms are caterpillars of the silk moth. (T)
(b) In India, camels and goats are generally reared for obtaining wool. (F)
(c) The rearing of silkworms for obtaining silk is called silviculture.(F)
(d) In the process of obtaining wool from fleece, sorting is done after scouring.(F)
(e) Yak hair is not used to make woollen fabric. (T)