🔵 1. Which silkworm species is primarily used for commercial silk production in India?
A) Antheraea mylitta
B) Philosamia ricini
C) Bombyx mori
D) Antheraea assamensis
Answer: C
Rationale: Bombyx mori is the primary domesticated species used for producing mulberry silk.
🔵 2. What is the primary food plant of the mulberry silkworm?
A) Castor
B) Mulberry
C) Oak
D) Sal
Answer: B
Rationale: Bombyx mori feeds exclusively on mulberry leaves.
🔵 3. Which state is the largest producer of silk in India?
A) Assam
B) West Bengal
C) Karnataka
D) Tamil Nadu
Answer: C
Rationale: Karnataka leads India in mulberry silk production.
🔵 4. Which type of silk is known for its golden yellow color?
A) Mulberry silk
B) Tussar silk
C) Muga silk
D) Eri silk
Answer: C
Rationale: Muga silk, unique to Assam, is golden-yellow and lustrous.
🔵 5. What is the process of removing silk from the cocoon called?
A) Spinning
B) Harvesting
C) Reeling
D) Twisting
Answer: C
Rationale: Reeling is the method of unwinding silk filaments from the cocoon.
🔵 6. What is the ideal temperature for rearing mulberry silkworms?
A) 20–22°C
B) 23–28°C
C) 15–18°C
D) 30–35°C
Answer: B
Rationale: Optimal temperature for silkworm growth and cocooning lies between 23°C–28°C.
🔵 7. How many instars are there in the lifecycle of Bombyx mori larvae?
A) Three
B) Four
C) Five
D) Six
Answer: C
Rationale: The larval stage of Bombyx mori has five instars.
🔵 8. Which disease in silkworms is caused by a protozoan?
A) Flacherie
B) Grasserie
C) Pebrine
D) Muscardine
Answer: C
Rationale: Pebrine is caused by Nosema bombycis, a protozoan parasite.
🔵 9. Which silk variety is also known as “peace silk”?
A) Eri silk
B) Tussar silk
C) Muga silk
D) Mulberry silk
Answer: A
Rationale: Eri silk is extracted without killing the pupa, hence the name "peace silk."
🔵 10. What is the scientific name of the host plant for Eri silkworms?
A) Ricinus communis
B) Morus alba
C) Terminalia arjuna
D) Ficus religiosa
Answer: A
Rationale: Eri silkworms feed on castor leaves (Ricinus communis).
🔵 11. Which stage of the silkworm spins the silk thread?
A) Egg
B) Larva
C) Pupa
D) Adult
Answer: B
Rationale: The larval stage spins the cocoon using silk thread from its glands.
🔵 12. Which country is the largest producer of silk in the world?
A) Japan
B) Brazil
C) China
D) India
Answer: C
Rationale: China leads the world in silk production.
🔵 13. What is the duration of the silkworm’s life cycle under optimal conditions?
A) 15–20 days
B) 20–30 days
C) 35–40 days
D) 50–60 days
Answer: C
Rationale: The entire life cycle of Bombyx mori takes about 35–40 days.
🔵 14. Which disease in silkworms is caused by a virus?
A) Pebrine
B) Grasserie
C) Muscardine
D) Flacherie
Answer: B
Rationale: Grasserie is caused by a virus, leading to swollen larvae.
🔵 15. Which silk moth is reared on oak leaves?
A) Antheraea mylitta
B) Antheraea assamensis
C) Bombyx mori
D) Antheraea pernyi
Answer: D
Rationale: Antheraea pernyi, used in temperate regions, feeds on oak leaves.
🔵 16. What is the average silk filament length from a single cocoon of Bombyx mori?
A) 100–200 m
B) 300–400 m
C) 600–900 m
D) 1–2 km
Answer: C
Rationale: A single cocoon can yield 600 to 900 meters of filament.
🔵 17. The cocoon is made primarily of which protein?
A) Keratin
B) Fibroin
C) Casein
D) Albumin
Answer: B
Rationale: Fibroin is the structural protein forming the silk fiber.
🔵 18. What is the binding agent of silk fiber in cocoons?
A) Albumin
B) Casein
C) Sericin
D) Myosin
Answer: C
Rationale: Sericin is the gum-like protein that binds silk threads together.
🔵 19. Which government agency promotes sericulture in India?
A) ICAR
B) NABARD
C) Central Silk Board
D) FSSAI
Answer: C
Rationale: The Central Silk Board is responsible for developing and promoting sericulture in India.
🔵 20. In which form is silk stored inside the silkworm’s body before spinning?
A) Fibroin
B) Gel
C) Liquid
D) Protein pellets
Answer: C
Rationale: Silk is stored as a viscous liquid in the glands of the larva.
🔵 21. Which of the following silkworms is polyphagous in nature?
A) Bombyx mori
B) Antheraea mylitta
C) Antheraea assamensis
D) Philosamia ricini
Answer: D
Rationale: Philosamia ricini (Eri silkworm) can feed on multiple host plants like castor and tapioca, making it polyphagous.
🔵 22. What is the scientific name of the mulberry plant commonly cultivated for silkworm feeding?
A) Morus alba
B) Ricinus communis
C) Ficus indica
D) Musa paradisiaca
Answer: A
Rationale: Morus alba is the white mulberry species widely cultivated for silkworm feed.
🔵 23. Which is the first step in the process of sericulture?
A) Reeling
B) Silkworm rearing
C) Mulberry cultivation
D) Cocoon sorting
Answer: C
Rationale: Mulberry cultivation is essential before rearing silkworms since it provides their exclusive food source.
🔵 24. What is the incubation period of silkworm eggs under normal conditions?
A) 2–3 days
B) 4–6 days
C) 7–10 days
D) 12–15 days
Answer: C
Rationale: Silkworm eggs typically hatch within 7–10 days under ideal temperature and humidity.
🔵 25. What type of metamorphosis is observed in the silkworm lifecycle?
A) Incomplete
B) Gradual
C) Complete
D) Partial
Answer: C
Rationale: Silkworms undergo complete metamorphosis: egg → larva → pupa → adult.
🔵 26. Which method is used for disinfecting silkworm rearing houses?
A) Quicklime
B) Formalin spray
C) Ethanol wash
D) Boiling water
Answer: B
Rationale: 2% formalin solution is widely used for disinfection in silkworm rearing rooms.
🔵 27. How many crops of mulberry can be harvested annually in tropical India?
A) 1
B) 2
C) 3
D) 5–6
Answer: D
Rationale: In tropical conditions, 5–6 mulberry harvests are possible annually.
🔵 28. Sericulture provides income to which category of farmers primarily in India?
A) Large landholders
B) Urban households
C) Marginal and small farmers
D) Plantation owners
Answer: C
Rationale: Sericulture is a labor-intensive and supplementary income source for marginal and small farmers.
🔵 29. Which part of the silkworm secretes silk?
A) Midgut
B) Silk gland
C) Spiracles
D) Salivary gland
Answer: B
Rationale: Silk is secreted by the paired silk glands of the larva.
🔵 30. What is meant by “decoupling” in sericulture?
A) Separation of male and female cocoons
B) Removal of pupae from cocoons
C) Cutting cocoon filament
D) Degumming the silk
Answer: B
Rationale: Decoupling refers to the removal of pupae from the cocoon before reeling.
🔵 31. What is bivoltine silk?
A) Silk produced twice in a year
B) Silk from wild worms
C) Silk from polyphagous worms
D) Silk produced during rainy season
Answer: A
Rationale: Bivoltine strains produce two generations per year and are preferred for quality silk.
🔵 32. What is the function of sericin in a cocoon?
A) Core fiber
B) Binding agent
C) Nutrient store
D) Enzyme
Answer: B
Rationale: Sericin binds the fibroin filaments to form a cohesive cocoon.
🔵 33. Which silk has the highest tensile strength?
A) Mulberry silk
B) Tussar silk
C) Muga silk
D) Eri silk
Answer: C
Rationale: Muga silk is known for its durability and natural strength.
🔵 34. Tussar silkworms mainly feed on which plant?
A) Terminalia arjuna
B) Ricinus communis
C) Morus alba
D) Azadirachta indica
Answer: A
Rationale: Terminalia arjuna and Terminalia tomentosa are host plants for Tussar silkworms.
🔵 35. What is the reeling efficiency of cocoons known as?
A) Filament ratio
B) Renditta
C) Shell percentage
D) Degumming rate
Answer: B
Rationale: Renditta is the amount of cocoon required to produce 1 kg of raw silk.
🔵 36. A higher shell ratio in cocoons implies:
A) Poor quality silk
B) Thicker silk
C) Higher silk yield
D) Less silk loss
Answer: C
Rationale: Shell ratio indicates the proportion of cocoon weight contributing to silk, affecting yield.
🔵 37. Which month is ideal for silkworm rearing in South India?
A) May
B) January
C) August
D) November
Answer: D
Rationale: November offers ideal conditions for successful silkworm rearing due to favorable temperature and humidity.
🔵 38. Eri silk is mainly produced in which region of India?
A) Tamil Nadu
B) Maharashtra
C) North-East India
D) Gujarat
Answer: C
Rationale: Eri silk is predominantly produced in Assam and neighboring northeastern states.
🔵 39. What is chawki rearing in sericulture?
A) Late-stage larval rearing
B) Pupa management
C) Early-stage larval rearing
D) Cocoon harvesting
Answer: C
Rationale: Chawki rearing refers to managing early instar (1st and 2nd) larvae.
🔵 40. How is a hybrid silkworm strain developed?
A) Mutation
B) Pure breeding
C) Crossbreeding
D) Natural selection
Answer: C
Rationale: Crossbreeding two pure lines leads to hybrid vigor and better cocoon traits.
🔵 41. Which equipment is used for cocoon cooking before reeling?
A) Steamer
B) Oven
C) Autoclave
D) Hot air dryer
Answer: A
Rationale: Steaming softens the sericin and facilitates filament unwinding.
🔵 42. Which is the best silk for weaving sarees in India?
A) Eri silk
B) Muga silk
C) Tussar silk
D) Mulberry silk
Answer: D
Rationale: Mulberry silk is fine and smooth, preferred for sarees and textiles.
🔵 43. The silkworm pupa inside the cocoon becomes:
A) Another larva
B) Adult moth
C) Cocoon
D) Egg
Answer: B
Rationale: The pupa undergoes metamorphosis and emerges as an adult moth.
🔵 44. Cocoon harvesting is generally done at which stage?
A) Before spinning
B) After 7 days of spinning
C) After moth emergence
D) After egg laying
Answer: B
Rationale: Cocoons are harvested 7–8 days after spinning but before moth emergence.
🔵 45. Which country is India’s main competitor in silk exports?
A) Bangladesh
B) Sri Lanka
C) Thailand
D) China
Answer: D
Rationale: China dominates global silk production and export.
🔵 46. What is the average lifespan of an adult silk moth?
A) 2–3 hours
B) 1 day
C) 5–10 days
D) 30 days
Answer: C
Rationale: Adult moths live for about 5–10 days, during which they mate and lay eggs.
🔵 47. Which part of India has favorable climate for all-year sericulture?
A) Kashmir
B) Karnataka
C) Himachal Pradesh
D) Punjab
Answer: B
Rationale: Karnataka’s mild and humid climate supports year-round mulberry cultivation and silkworm rearing.
🔵 48. What is the main aim of bivoltine silkworm breeding programs in India?
A) Cost reduction
B) Increasing moth size
C) Improving yield and quality
D) Disease resistance only
Answer: C
Rationale: Bivoltine breeding focuses on high yield and superior quality silk.
🔵 49. Moth emergence from cocoon is prevented to:
A) Increase silk length
B) Protect pupae
C) Allow easier hatching
D) Avoid silk breakage
Answer: D
Rationale: Moth emergence breaks the filament; hence, cocoons are harvested before.
🔵 50. The main source of income in sericulture is:
A) Egg sales
B) Rearing equipment
C) Silk thread
D) Mulberry leaves
Answer: C
Rationale: The silk thread obtained after reeling cocoons is the main commercial product.
%20(2).png)
 on Sericulture){kind=link}
0 Comments