Questions and answers
Class 7, Chapter 3 - Fibre to Fabric | NCERT
All questions and answers from this set. How fibres are processed? How to make wool and silk. Science class 7 chapter 3 exercise test and solutions.
Questions: 14
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Question 1
How many types of fibres one can find on sheep's body?
two
Question 2
Match sheep breed with its quality.
Lohi
good quality wool
Rampur bushair
brown fleece
Nali
carpet wool
Bakharwal
For woollen shawls
Marwari
Coarse wool
Patanwadi
For hosiery
Question 3
Which sentences are true?
Only the fine under-hair provides fiber for making wool
True
There are breeds of sheep that provides only fine under-hair.
True
Mohair is obtained from yaks.
False
Question 4
Put in order stages of procesing fibre to wool.
1
Shearing
2
Scouring
3
Sorting
4
Cleaning of burrs
5
Dyeing
6
Rolling
Question 5
What kind of organism can cause a fatal blood disease in wool industry workers?
It is
bacterium
called anthrax
.Question 6
Rearing silkworms for obtaining silk is called:
sericulture
Question 7
Silk is made of:
protein
Question 8
What is the name of a silkworm development stage when it is covered with cocoon?
pupa
Question 9
What is the most common silk moth?
mulberry silk moth
Question 10
Which country leads in world silk production?
China
Question 11
Put in order silk moth lifecycle.
1
egg
2
larvae
3
pupa
4
moth
Question 12
How long it takes for mulberry moth from hatching to spin a cocoon?
about 25 to 30 days
Question 13
How silk fibres are separated from cocoons?
with temperature
Question 14
Which of statements are true?
Wool keeps warm better than silk.
True
Silkworm feed on Mulberry leaves.
True
Morus alba is a scientific name for mulberry moth.
False