Wool and Silk Production MCQs
CBSE Class 7 Science – Wool and Silk Production MCQs with Answers & Explanations
Class: 7
Subject: Science
Section: Fibre to Fabric
Topic: Wool and Silk Production
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each question includes a detailed explanation to help students clearly understand the concepts of wool and silk production.
Subject: Science
Section: Fibre to Fabric
Topic: Wool and Silk Production
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each question includes a detailed explanation to help students clearly understand the concepts of wool and silk production.
1. Wool is obtained from the fleece of which animals?
Answer: B. Sheep
Sheep are the primary source of wool. Their hair (fleece) is processed to make woollen fibres used in garments.
Sheep are the primary source of wool. Their hair (fleece) is processed to make woollen fibres used in garments.
2. The process of removing fleece from sheep is called:
Answer: B. Shearing
Shearing involves cutting off the sheep’s fleece using special machines, usually during summer.
Shearing involves cutting off the sheep’s fleece using special machines, usually during summer.
3. Which Indian breed of sheep gives high-quality wool?
Answer: A. Lohi
Lohi sheep, found in Rajasthan and Punjab, produce good quality wool used for garments.
Lohi sheep, found in Rajasthan and Punjab, produce good quality wool used for garments.
4. Cleaning of fleece is known as:
Answer: B. Scouring
Scouring removes dirt, grease, and dust from the fleece before further processing.
Scouring removes dirt, grease, and dust from the fleece before further processing.
5. Silk fibre is obtained from:
Answer: B. Silkworm cocoon
Silk comes from the cocoon spun by silkworm larvae during their life cycle.
Silk comes from the cocoon spun by silkworm larvae during their life cycle.
6. Rearing of silkworms is called:
Answer: B. Sericulture
Sericulture is the farming practice of rearing silkworms for silk production.
Sericulture is the farming practice of rearing silkworms for silk production.
7. Silkworms feed mainly on:
Answer: C. Mulberry leaves
Mulberry leaves provide the essential nutrients required for silk production.
Mulberry leaves provide the essential nutrients required for silk production.
8. The larva of silk moth is called:
Answer: B. Silkworm
The larval stage of the silk moth is called silkworm, which spins the cocoon.
The larval stage of the silk moth is called silkworm, which spins the cocoon.
9. Silk fibre is a:
Answer: C. Animal fibre
Silk is produced by insects, so it is classified as an animal fibre.
Silk is produced by insects, so it is classified as an animal fibre.
10. Boiling cocoons helps to:
Answer: B
Boiling softens the gum (sericin) so silk threads can be reeled easily.
Boiling softens the gum (sericin) so silk threads can be reeled easily.
11. Sorting of fleece is done based on:
Answer: B
Fibres are sorted by texture, length, and quality for different uses.
Fibres are sorted by texture, length, and quality for different uses.
12. Kashmiri goats produce:
Answer: A
Pashmina is a fine variety of wool from Kashmiri goats.
Pashmina is a fine variety of wool from Kashmiri goats.
13. Reeling means:
Answer: C
Reeling extracts long silk threads from cocoons.
Reeling extracts long silk threads from cocoons.
14. Which stage spins the cocoon?
Answer: B
The larva secretes silk to form the cocoon.
The larva secretes silk to form the cocoon.
15. Yak wool is common in:
Answer: C
Yaks live in cold mountainous regions; their wool protects against cold.
Yaks live in cold mountainous regions; their wool protects against cold.
16. The sticky substance on silk is:
Answer: B
Sericin binds silk fibres together in the cocoon.
Sericin binds silk fibres together in the cocoon.
17. Wool fibre is mainly made of:
Answer: B
Wool contains keratin protein, giving warmth and elasticity.
Wool contains keratin protein, giving warmth and elasticity.
18. Which climate favours sheep rearing?
Answer: B
Cold climates help sheep grow thick fleece.
Cold climates help sheep grow thick fleece.
19. Tussar silk is obtained from:
Answer: B
Tussar silk comes from wild silkworm species.
Tussar silk comes from wild silkworm species.
20. The adult silk moth emerges by breaking:
Answer: B
The moth cuts open the cocoon to come out, which can break the silk filament.
The moth cuts open the cocoon to come out, which can break the silk filament.