Crop Production (Kharif & Rabi)–MCQ Series 17

By Skumar

 

Crop Production (Kharif & Rabi)–MCQ Series 17


PART A: SUNN HEMP (Crotalaria juncea) 

1. Sunn hemp belongs to which family?

A. Malvaceae
B. Fabaceae
C. Poaceae
D. Asteraceae

✅ Answer: B. Fabaceae
📝 Explanation: Sunn hemp is a leguminous crop belonging to the Fabaceae family.

2. Botanical name of Sunn hemp is:

A. Crotalaria juncea
B. Corchorus olitorius
C. Hibiscus sabdariffa
D. Gossypium hirsutum

✅ Answer: A. Crotalaria juncea
📝 Explanation: The cultivated Sunn hemp is botanically known as Crotalaria juncea L.

3. Sunn hemp is mainly grown for:

A. Fibre
B. Oil
C. Pulses
D. Medicinal use

✅ Answer: A. Fibre
📝 Explanation: Sunn hemp is grown for bast fibre used in ropes, mats, and handicrafts.

4. Sunn hemp is a:

A. Annual crop
B. Biennial crop
C. Perennial crop
D. Short-lived perennial

✅ Answer: A. Annual crop
📝 Explanation: Sunn hemp completes its life cycle within one year.

5. Centre of origin of Sunn hemp is:

A. India
B. Africa
C. South America
D. Southeast Asia

✅ Answer: B. Africa
📝 Explanation: Sunn hemp is native to tropical Africa.

6. Sunn hemp is a:

A. Kharif crop
B. Rabi crop
C. Summer crop
D. Perennial crop

✅ Answer: A. Kharif crop
📝 Explanation: It is mainly grown during monsoon (Kharif) season.

7. Ideal soil for Sunn hemp cultivation is:

A. Heavy clay
B. Light to medium loam
C. Saline soil
D. Sandy desert soil

✅ Answer: B. Light to medium loam
📝 Explanation: Well-drained loamy soil ensures healthy growth and fibre quality.

8. Soil pH suitable for Sunn hemp is:

A. 4.5–5.5
B. 6.0–7.5
C. 7.5–8.5
D. Above 9.0

✅ Answer: B. 6.0–7.5
📝 Explanation: Neutral to slightly acidic soils favor Sunn hemp growth.

9. Recommended seed rate for Sunn hemp:

A. 10–15 kg/ha
B. 20–25 kg/ha
C. 30–35 kg/ha
D. 5–7 kg/ha

✅ Answer: A. 10–15 kg/ha
📝 Explanation: Small seed size requires low to moderate seed rate for line sowing.

10. Optimum spacing for Sunn hemp is:

A. 30 × 10 cm
B. 45 × 15 cm
C. 60 × 20 cm
D. 75 × 30 cm

✅ Answer: B. 45 × 15 cm
📝 Explanation: Spacing ensures proper aeration and better fibre yield.

11. Sunn hemp is a nitrogen-fixing crop because it:

A. Absorbs N from air
B. Forms symbiosis with Rhizobium
C. Uses soil nitrogen only
D. Does not fix nitrogen

✅ Answer: B. Forms symbiosis with Rhizobium
📝 Explanation: Leguminous crop forms nodules with Rhizobium bacteria to fix atmospheric nitrogen.

12. Critical stage of irrigation in Sunn hemp is:

A. Seedling stage
B. Flowering stage
C. Fibre development stage
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Water is essential at early vegetative, flowering, and fibre formation stages.

13. Sunn hemp is sown using which method?

A. Broadcasting
B. Line sowing
C. Transplanting
D. Raised bed planting

✅ Answer: B. Line sowing
📝 Explanation: Line sowing helps maintain spacing and reduces weed competition.

14. Recommended NPK dose for Sunn hemp (general):

A. 40:20:20 kg/ha
B. 60:30:30 kg/ha
C. 80:40:40 kg/ha
D. 100:50:50 kg/ha

✅ Answer: A. 40:20:20 kg/ha
📝 Explanation: Moderate fertilization is sufficient due to nitrogen-fixing ability.

15. Sunn hemp is harvested at:

A. Full flowering
B. 2–3 weeks after flowering
C. Mature pods
D. Early vegetative stage

✅ Answer: B. 2–3 weeks after flowering
📝 Explanation: Fibre is optimum when stem is mature but not overly lignified.

16. Major disease of Sunn hemp:

A. Powdery mildew
B. Leaf spot
C. Yellow mosaic virus
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Various fungal and viral diseases affect Sunn hemp depending on region.

17. Sunn hemp fibre is mainly obtained from:

A. Leaves
B. Stem bark
C. Seeds
D. Roots

✅ Answer: B. Stem bark
📝 Explanation: It is a bast fibre crop; fibre is extracted from stem bark.

18. Sunn hemp improves soil fertility because:

A. It is deep-rooted
B. It fixes atmospheric nitrogen
C. It adds organic matter
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Sunn hemp is often used as a green manure crop.

19. Average fibre yield of Sunn hemp:

A. 1–2 t/ha
B. 2–3 t/ha
C. 3–4 t/ha
D. 5–6 t/ha

✅ Answer: B. 2–3 t/ha
📝 Explanation: Yield depends on variety and management practices.

20. Major states growing Sunn hemp in India:

A. Tamil Nadu, Karnataka, Andhra Pradesh
B. Punjab, Haryana, Gujarat
C. West Bengal, Bihar
D. Assam, Odisha

✅ Answer: A. Tamil Nadu, Karnataka, Andhra Pradesh
📝 Explanation: Southern India is suitable due to warm climate and Kharif rainfall.

21. Sunn hemp seed contains:

A. 20–25% oil
B. 5–7% oil
C. 40–45% oil
D. 10–15% oil

✅ Answer: B. 5–7% oil
📝 Explanation: Seeds have small oil content; crop is grown mainly for fibre.

22. Fibre extraction in Sunn hemp is done by:

A. Retting
B. Decortication
C. Scutching
D. Hand picking

✅ Answer: A. Retting
📝 Explanation: Retting is a microbial process to separate fibre from stem.

23. Sunn hemp is sensitive to:

A. Waterlogging
B. Drought
C. Shade
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Waterlogging and shade reduce fibre quality; drought limits biomass.

24. Sunn hemp is an ideal crop for:

A. Fodder
B. Green manure
C. Fibre
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Multi-purpose crop: fibre, fodder, and soil improvement.

25. Retting time for Sunn hemp stems:

A. 1–2 days
B. 5–10 days
C. 15–20 days
D. 25–30 days

✅ Answer: B. 5–10 days
📝 Explanation: Water or microbial retting separates fibre efficiently within 5–10 days.

🌿 PART B: KENAF (Hibiscus cannabinus) – 25 MCQs

26. Kenaf belongs to which family?

A. Malvaceae
B. Fabaceae
C. Poaceae
D. Asteraceae

✅ Answer: A. Malvaceae
📝 Explanation: Kenaf is a bast fibre crop from the Malvaceae family.

27. Botanical name of Kenaf is:

A. Hibiscus sabdariffa
B. Hibiscus cannabinus
C. Corchorus capsularis
D. Gossypium arboreum

✅ Answer: B. Hibiscus cannabinus
📝 Explanation: Kenaf is scientifically called Hibiscus cannabinus L.

28. Kenaf is mainly grown for:

A. Oil
B. Fibre
C. Seeds
D. Food

✅ Answer: B. Fibre
📝 Explanation: Bast fibre from stem is used in ropes, mats, and paper.

29. Kenaf is a:

A. Annual crop
B. Biennial crop
C. Perennial crop
D. Short-lived perennial

✅ Answer: A. Annual crop
📝 Explanation: Kenaf completes life cycle within one year.

30. Centre of origin of Kenaf is:

A. Africa
B. India
C. South America
D. Southeast Asia

✅ Answer: A. Africa
📝 Explanation: Kenaf is native to tropical Africa.

31. Kenaf is a:

A. Kharif crop
B. Rabi crop
C. Summer crop
D. Winter crop

✅ Answer: A. Kharif crop
📝 Explanation: Kenaf requires warm temperatures and adequate monsoon rainfall.

32. Recommended seed rate for Kenaf:

A. 5–10 kg/ha
B. 10–12 kg/ha
C. 15–20 kg/ha
D. 25–30 kg/ha

✅ Answer: C. 15–20 kg/ha
📝 Explanation: Moderate seed rate ensures optimum plant population for fibre yield.

33. Ideal spacing for Kenaf:

A. 45 × 15 cm
B. 60 × 20 cm
C. 75 × 25 cm
D. 90 × 30 cm

✅ Answer: B. 60 × 20 cm
📝 Explanation: Adequate spacing favors stem development and fibre quality.

34. Kenaf is mainly a:

A. Self-pollinated crop
B. Cross-pollinated crop
C. Apomictic crop
D. Vegetatively propagated

✅ Answer: B. Cross-pollinated crop
📝 Explanation: Kenaf is insect-pollinated and shows genetic variability.

35. Kenaf fibre is obtained from:

A. Leaves
B. Seeds
C. Stem bark
D. Roots

✅ Answer: C. Stem bark
📝 Explanation: Kenaf is a bast fibre crop, fibre is extracted from the stem.

36. Kenaf performs best in soil pH range:

A. 4.5–5.5
B. 5.5–7.5
C. 7.5–8.5
D. Above 9.0

✅ Answer: B. 5.5–7.5
📝 Explanation: Neutral to slightly acidic soils favor growth.

37. Critical stage of irrigation in Kenaf:

A. Seedling stage
B. Vegetative stage
C. Flowering stage
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Water stress at any stage reduces fibre yield and quality.

38. Kenaf is sensitive to:

A. Frost
B. Shade
C. Waterlogging
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Requires warm, sunny, and well-drained conditions.

39. Recommended NPK dose for Kenaf:

A. 40:20:20 kg/ha
B. 60:30:30 kg/ha
C. 80:40:40 kg/ha
D. 100:50:50 kg/ha

✅ Answer: B. 60:30:30 kg/ha
📝 Explanation: Kenaf requires moderate NPK for optimal growth.

40. Kenaf harvesting is done at:

A. 90–100 DAS
B. 120–140 DAS
C. 150–160 DAS
D. 180 DAS

✅ Answer: B. 120–140 DAS
📝 Explanation: Harvest at flowering-maturity stage for fibre extraction.

41. Kenaf fibre is extracted by:

A. Retting
B. Decortication
C. Scutching
D. Hand peeling

✅ Answer: A. Retting
📝 Explanation: Microbial retting separates bast fibre efficiently.

42. Kenaf is grown mainly in:

A. Southern India
B. Western India
C. Eastern India
D. Northern India

✅ Answer: C. Eastern India
📝 Explanation: Moisture-retentive soils and warm climate favor Kenaf.

43. Kenaf is used in:

A. Ropes and mats
B. Paper pulp
C. Handicrafts
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Multi-purpose crop; versatile industrial uses.

44. Kenaf stem contains:

A. 20–25% fibre
B. 35–40% fibre
C. 45–50% fibre
D. 55–60% fibre

✅ Answer: B. 35–40% fibre
📝 Explanation: Fibre content varies with variety and growing conditions.

45. Kenaf is mainly harvested manually or mechanically?

A. Manually
B. Mechanically
C. Both
D. Neither

✅ Answer: C. Both
📝 Explanation: Harvesting can be done manually or using specialized machinery.

46. Kenaf improves soil because:

A. Deep roots
B. Biomass addition
C. Reduces weeds
D. A & B

✅ Answer: D. A & B
📝 Explanation: Kenaf adds biomass and improves soil structure.

47. Kenaf is an ideal crop for:

A. Paper industry
B. Ropes and mats
C. Fodder
D. All of the above

✅ Answer: D. All of the above
📝 Explanation: Multipurpose crop with economic importance.

48. Kenaf seeds contain:

A. 15–20% oil
B. 5–6% oil
C. 25–30% oil
D. 35–40% oil

✅ Answer: B. 5–6% oil
📝 Explanation: Seeds have minor oil content; primary product is fibre.

49. Fibre quality of Kenaf improves with:

A. Early harvesting
B. Late harvesting
C. High rainfall
D. Low sunlight

✅ Answer: A. Early harvesting
📝 Explanation: Early harvesting prevents excessive lignification.

50. Average fibre yield of Kenaf:

A. 1–2 t/ha
B. 2–3 t/ha
C. 3–4 t/ha
D. 4–5 t/ha

✅ Answer: B. 2–3 t/ha
📝 Explanation: Yield depends on variety, soil, and management practices.



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