1. The scientific name of upland cotton is:
A. Gossypium arboreum
B. Gossypium herbaceum
C. Gossypium hirsutum
D. Gossypium barbadense
Answer: C
Rationale: Gossypium hirsutum accounts for the majority of global cotton production.
2. Cotton belongs to the family:
A. Malvaceae
B. Poaceae
C. Fabaceae
D. Solanaceae
Answer: A
Rationale: Cotton is a member of the Malvaceae family.
3. Cotton is mainly grown for its:
A. Seed oil
B. Lint (fiber)
C. Stem
D. Leaves
Answer: B
Rationale: The primary economic product is lint (fiber).
4. The cotton fiber develops from:
A. Epidermal cells of seed coat
B. Endosperm
C. Ovary wall
D. Vascular tissue
Answer: A
Rationale: Cotton fibers are elongated epidermal cells of the seed coat.
5. Cotton is classified as:
A. Cereal crop
B. Oilseed crop
C. Fibre crop
D. Pulse crop
Answer: C
Rationale: Cotton is the most important natural fibre crop.
6. Which cotton species is diploid?
A. G. hirsutum
B. G. barbadense
C. G. arboreum
D. Both C and A
Answer: C
Rationale: G. arboreum and G. herbaceum are diploid species.
7. The chromosome number of G. hirsutum is:
A. 2n = 26
B. 2n = 39
C. 2n = 52
D. 2n = 78
Answer: C
Rationale: G. hirsutum is tetraploid (2n = 52).
8. Cotton is primarily a:
A. Rabi crop
B. Kharif crop
C. Zaid crop
D. Perennial crop
Answer: B
Rationale: Cotton is mainly grown during the kharif season.
9. Cotton requires which climate?
A. Cool and humid
B. Warm with moderate rainfall
C. Cold and dry
D. Frost-prone climate
Answer: B
Rationale: Cotton thrives in warm climates with moderate rainfall.
10. The optimum temperature for cotton growth is:
A. 10–15°C
B. 15–20°C
C. 21–30°C
D. 35–40°C
Answer: C
Rationale: Cotton grows best at 21–30°C.
11. Cotton is highly sensitive to:
A. High temperature
B. Frost
C. Wind
D. Sunlight
Answer: B
Rationale: Cotton is very sensitive to frost.
12. The economic part of cotton plant is:
A. Flower
B. Boll
C. Seedling
D. Root
Answer: B
Rationale: The boll contains lint and seed.
13. The fruit of cotton is called:
A. Capsule
B. Berry
C. Boll
D. Pod
Answer: C
Rationale: Cotton fruit is known as a boll.
14. Cotton flowers show:
A. Cleistogamy
B. Self-pollination only
C. Often cross-pollination
D. Apomixis
Answer: C
Rationale: Cotton is often cross-pollinated due to insect activity.
15. The pollination in cotton is mainly by:
A. Wind
B. Water
C. Insects
D. Birds
Answer: C
Rationale: Insects play a major role in cotton pollination.
16. The soil best suited for cotton cultivation is:
A. Sandy soil
B. Red soil
C. Black cotton soil
D. Laterite soil
Answer: C
Rationale: Black cotton soils retain moisture well.
17. Cotton requires soil pH in the range of:
A. 4.0–5.0
B. 5.0–5.5
C. 6.0–8.0
D. 8.5–9.5
Answer: C
Rationale: Cotton tolerates slightly acidic to alkaline soils.
18. Cotton is drought tolerant mainly due to:
A. Shallow roots
B. Deep root system
C. Thick leaves
D. Short duration
Answer: B
Rationale: A deep root system helps withstand drought.
19. Excess rainfall during flowering causes:
A. Increased boll formation
B. Reduced pest attack
C. Flower and boll shedding
D. Better lint quality
Answer: C
Rationale: Excess moisture leads to shedding.
20. The recommended seed rate for cotton is about:
A. 5–6 kg/ha
B. 10–12 kg/ha
C. 15–20 kg/ha
D. 25–30 kg/ha
Answer: B
Rationale: About 10–12 kg/ha is common for varieties.
21. Spacing in cotton is important mainly to:
A. Reduce fertilizer cost
B. Control pests
C. Ensure proper canopy and boll development
D. Increase seed size
Answer: C
Rationale: Proper spacing improves growth and yield.
22. Nitrogen deficiency in cotton causes:
A. Dark green leaves
B. Excess vegetative growth
C. Yellowing of older leaves
D. Boll cracking
Answer: C
Rationale: Nitrogen deficiency leads to chlorosis of older leaves.
23. Excess nitrogen application in cotton results in:
A. Early maturity
B. More vegetative growth and delayed boll opening
C. Reduced pest incidence
D. Better fiber strength
Answer: B
Rationale: Excess nitrogen delays reproductive growth.
24. Which nutrient improves fibre quality in cotton?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Calcium
Answer: C
Rationale: Potassium improves fibre length and strength.
25. The most critical stage for irrigation in cotton is:
A. Germination
B. Flowering and boll development
C. Maturity
D. Harvesting
Answer: B
Rationale: Moisture stress at this stage reduces yield.
26. The practice of removing excess shoots in cotton is called:
A. Thinning
B. Topping
C. Pruning
D. Detopping
Answer: B
Rationale: Topping controls excessive vegetative growth.
27. The major pest of cotton in India is:
A. Aphid
B. Bollworm
C. White grub
D. Cutworm
Answer: B
Rationale: Bollworms cause major yield losses.
28. Bt cotton provides resistance mainly against:
A. Sucking pests
B. Bollworms
C. Weeds
D. Fungal diseases
Answer: B
Rationale: Bt toxin targets bollworms.
29. Whitefly damage in cotton causes:
A. Root rot
B. Leaf curl disease
C. Boll cracking
D. Wilt
Answer: B
Rationale: Whitefly transmits leaf curl virus.
30. The major disease of cotton caused by fungus is:
A. Leaf curl
B. Bacterial blight
C. Fusarium wilt
D. Mosaic
Answer: C
Rationale: Fusarium wilt is a common fungal disease.
31. Cotton leaf curl disease is transmitted by:
A. Aphid
B. Thrips
C. Whitefly
D. Jassid
Answer: C
Rationale: Whitefly is the vector.
32. Defoliation in cotton refers to:
A. Leaf fall due to disease
B. Artificial removal of leaves before harvest
C. Natural senescence
D. Pruning of branches
Answer: B
Rationale: Defoliants aid uniform boll opening.
33. Harvesting of cotton is done when:
A. Leaves turn yellow
B. Bolls burst open
C. Flowers appear
D. Plants dry completely
Answer: B
Rationale: Open bolls indicate readiness for harvest.
34. Cotton is harvested mainly by:
A. Uprooting
B. Cutting
C. Hand picking
D. Digging
Answer: C
Rationale: Hand picking preserves fibre quality.
35. Picking cotton early morning is avoided because:
A. Fibre breaks easily
B. Presence of dew increases moisture
C. Bolls are not open
D. More pests
Answer: B
Rationale: Moisture reduces fibre quality.
36. Cotton lint quality is measured mainly by:
A. Boll size
B. Fibre length and strength
C. Seed size
D. Plant height
Answer: B
Rationale: Fibre properties determine market value.
37. Ginning is the process of:
A. Harvesting cotton
B. Separating lint from seed
C. Drying cotton
D. Packaging cotton
Answer: B
Rationale: Ginning separates fibre from seeds.
38. Cottonseed oil is extracted from:
A. Lint
B. Seed coat
C. Kernel
D. Boll wall
Answer: C
Rationale: Oil is obtained from seed kernel.
39. Cottonseed cake is used mainly as:
A. Human food
B. Animal feed (after detoxification)
C. Biofuel
D. Fiber source
Answer: B
Rationale: It is protein-rich but requires detoxification.
40. The major cotton-growing state in India is:
A. Punjab
B. Gujarat
C. Assam
D. Kerala
Answer: B
Rationale: Gujarat is the largest cotton producer.
41. The average duration of cotton crop is:
A. 90–100 days
B. 120–160 days
C. 180–200 days
D. 60–70 days
Answer: B
Rationale: Cotton is a medium to long duration crop.
42. Cotton is sensitive to which micronutrient deficiency?
A. Iron
B. Zinc
C. Boron
D. Molybdenum
Answer: C
Rationale: Boron deficiency affects boll formation.
43. The main function of phosphorus in cotton is:
A. Fibre elongation
B. Root development and early growth
C. Boll opening
D. Pest resistance
Answer: B
Rationale: Phosphorus supports root and early plant growth.
44. Intercropping in cotton is practiced mainly to:
A. Reduce plant population
B. Improve land use efficiency
C. Delay maturity
D. Increase irrigation need
Answer: B
Rationale: Intercropping improves resource utilization.
45. Cotton yield is expressed in terms of:
A. Fibre weight only
B. Seed weight only
C. Seed cotton
D. Lint percentage
Answer: C
Rationale: Yield is measured as seed cotton.
46. Lint percentage in cotton refers to:
A. Fibre strength
B. Proportion of lint in seed cotton
C. Fibre length
D. Boll weight
Answer: B
Rationale: It indicates ginning outturn.
47. Cotton is considered a cash crop because:
A. It matures early
B. It is consumed locally
C. It has high market value
D. It requires less input
Answer: C
Rationale: Cotton generates high income.
48. The main by-product of cotton industry is:
A. Straw
B. Oil cake
C. Cottonseed
D. All of the above
Answer: D
Rationale: Multiple valuable by-products are obtained.
49. Cotton plays a major role in:
A. Food security
B. Textile industry
C. Biofuel production
D. Livestock nutrition only
Answer: B
Rationale: Cotton is the backbone of the textile industry.
50. Cotton crop is best described as:
A. Short-duration cereal
B. Fibre and industrial crop
C. Oilseed crop only
D. Vegetable crop
Answer: B
Rationale: Cotton is primarily a fibre and industrial crop.
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