EXERCISES
9. The workers of silk industry face risks of disease
related to
a lungs
heart
c Skin
Both and
A. Multiple Choice Questions
Tick () the correct answers
1. Which of the following is not an animal libre?
a Silk
D Wool
Polyester d Pashmina
2
is the part of the body of shoop
that yields wool
Skin
b Fibre
Fleece
Flesh
B. Fill in the blanks:
1. Silk and wool are
products
2. Pashmina shawls are wovon from
wool
3. The world's finest wool is extracted from
sheep
4. Selective breeding of sheep involves the
cross breed between an indigenous and an
breed
5. The scientific name of silkworm is
3. Which of the following options is best suited
for the production of higher yield and superior
wool quality?
Rearing
Shearing
Breeding d Feeding
4. Silk is made of a
protein libro
sericin
b chitin
c. pectin
o libroin
5. Rearing of silkworm is called
a apiculture
sericulture
agriculture d None of these
6. The life cycle of a silkworm consists of ego.
larva,
and silk moth
7. The
effect of silk thread gives it
a natural shine
8.
is caused by Bacterium anthracis
C. Alternative Response Type:
State True or False
1. Cotton and jute are natural fibres,
6. Silk fibre is
a a good conductor of heat
b. a synthetic fibre
obtained from silk moth
d artificial fibre
2. Angora goat is found in Tibet
State Right or wrong:
1. Australia is one of the leading producers of
silk
7. The processes involved in making silk strands
are
a reeling, softening, sorting, baling
b. sorting, baling, recling, softening
sorting, softening, reeling, baling
d sorting, baling, softening, reeling
8. A non-mulberry silk product is
a. Muga silk b. Eri silk
C. Tasar silk
All of these
2. The life cycle of a silkworm consists of four
stages
State Yes or No:
1. The emergence of silk moth from cocoons helps
In maintaining the continuity of thread of the
COCOON
2. Is nylon a natural fibre?
Science 7
Answers
Answer:
9. (a) Lungs
A. Multiple Choice Questions
1. Polyester
2. Fleece
B. Fill in the blanks :
1. Silk and wool are animal products.
2. Pashmina shawls are woven from Pashmina goat wool.
3. The world's finest wool is extracted from Merino sheep.
4. Selective breeding of sheep involves the cross breed between an indigenous sheep breed and an modern sheep breed.
5. The scientific name of silkworm is Bombyx mori.
3. (c) Breeding
4. Fibroin
5. (b) Sericulture
7. (a) Reeling, softening, sorting, baling
8. (d) All of these
C. State true or false -
1. True
2. True
6. Silk is a poor conductor of heat. It is very sensitive to heat and it decomposes at 165 degree Celsius (330 degree Fahrenheit). It has to be ironed with wet plates because of this characteristic. It is a protein fiber, similar to wool.
State Right or Wrong -
1. Wrong
2. Right
State Yes or No
1. No
2. No
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Answer: