Crop Production (Kharif & Rabi)-MCQ Series 4

By Skumar

 

Crop Production (Kharif & Rabi)-MCQ Series 4


1. Soybean belongs to the family:

A. Poaceae
B. Fabaceae
C. Brassicaceae
D. Solanaceae

✅ Answer: B. Fabaceae
Explanation: Soybean is a leguminous crop capable of biological nitrogen fixation.

2. Centre of origin of soybean is:

A. India
B. China
C. Brazil
D. USA

✅ Answer: B. China
Explanation: Soybean originated in China, as per ICAR and FAO records.

3. Soybean is mainly grown as a:

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

✅ Answer: C. Kharif crop
Explanation: Soybean is predominantly grown during Kharif season under rainfed conditions.

4. Optimum temperature for soybean growth is:

A. 15–20°C
B. 20–25°C
C. 25–30°C
D. 35–40°C

✅ Answer: C. 25–30°C
Explanation: Warm and humid climate favours soybean growth.

5. Soybean is classified as a:

A. Short day plant
B. Long day plant
C. Day neutral plant
D. CAM plant

✅ Answer: A. Short day plant
Explanation: Soybean requires short day length for flowering.

6. Recommended seed rate for soybean is:

A. 40–50 kg/ha
B. 60–75 kg/ha
C. 80–100 kg/ha
D. 120–150 kg/ha

✅ Answer: B. 60–75 kg/ha
Explanation: Seed rate depends on variety and spacing, ICAR recommends ~70 kg/ha.

7. Recommended spacing for soybean is:

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

✅ Answer: C. 45 × 10 cm
Explanation: Ensures proper plant population and aeration.

8. Best method of sowing soybean is:

A. Broadcasting
B. Transplanting
C. Line sowing
D. Dibbling

✅ Answer: C. Line sowing
Explanation: Line sowing allows better weed control and interculture.

9. Optimum sowing time for soybean in India is:

A. April–May
B. June–July
C. August–September
D. October–November

✅ Answer: B. June–July
Explanation: Sowing coincides with onset of monsoon.

10. Depth of sowing in soybean should be:

A. 1–2 cm
B. 3–4 cm
C. 5–7 cm
D. 8–10 cm

✅ Answer: B. 3–4 cm
Explanation: Ensures good germination and seedling emergence.

11. Soybean roots develop nodules due to:

A. Azotobacter
B. Azospirillum
C. Rhizobium japonicum
D. Frankia

✅ Answer: C. Rhizobium japonicum
Explanation: Specific Rhizobium species forms nodules in soybean.

12. Seed treatment with Rhizobium improves:

A. Germination only
B. Nitrogen fixation
C. Weed control
D. Disease resistance

✅ Answer: B. Nitrogen fixation
Explanation: Enhances biological nitrogen fixation.

13. Recommended fertilizer dose for soybean is:

A. 20:40:20 NPK kg/ha
B. 30:60:30 NPK kg/ha
C. 40:80:40 NPK kg/ha
D. 60:120:60 NPK kg/ha

✅ Answer: B. 30:60:30 NPK kg/ha
Explanation: Soybean requires less nitrogen due to nodulation.

14. Sulphur is important in soybean for:

A. Oil synthesis
B. Protein synthesis
C. Chlorophyll formation
D. Root growth

✅ Answer: B. Protein synthesis
Explanation: Sulphur is essential for amino acids and protein formation.

15. Zinc deficiency in soybean causes:

A. Yellowing of old leaves
B. Leaf curling
C. Stunted growth
D. White banding

✅ Answer: C. Stunted growth
Explanation: Zinc deficiency reduces growth and yield.

16. Soybean is mostly grown under:

A. Irrigated condition
B. Rainfed condition
C. Flooded condition
D. Dryland only

✅ Answer: B. Rainfed condition
Explanation: Majority area is rainfed in India.

17. Critical stages for irrigation in soybean are:

A. Germination & flowering
B. Branching & flowering
C. Flowering & pod filling
D. Pod filling & maturity

✅ Answer: C. Flowering & pod filling
Explanation: Moisture stress here drastically reduces yield.

18. Soybean is sensitive to:

A. Drought
B. Salinity
C. Waterlogging
D. Frost

✅ Answer: C. Waterlogging
Explanation: Poor drainage causes root rot and yield loss.

19. Major weed problem period in soybean is:

A. 0–15 DAS
B. 15–45 DAS
C. 45–60 DAS
D. After flowering

✅ Answer: B. 15–45 DAS
Explanation: This is the critical weed competition period.

20. Pre-emergence herbicide recommended for soybean is:

A. Atrazine
B. Pendimethalin
C. 2,4-D
D. Paraquat

✅ Answer: B. Pendimethalin
Explanation: Controls annual grasses and broadleaf weeds.

21. Yellow mosaic virus in soybean is transmitted by:

A. Aphid
B. Thrips
C. Whitefly
D. Leafhopper

✅ Answer: C. Whitefly
Explanation: Whitefly acts as vector for YMV.

22. Rust disease in soybean is caused by:

A. Bacteria
B. Virus
C. Fungus
D. Nematode

✅ Answer: C. Fungus

23. Harvesting stage of soybean is identified by:

A. Green pods
B. Yellow pods
C. Leaf fall and brown pods
D. Shattering pods

✅ Answer: C. Leaf fall and brown pods
Explanation: Indicates physiological maturity.

24. Crop duration of soybean is:

A. 60–70 days
B. 75–85 days
C. 90–110 days
D. 130–150 days

✅ Answer: C. 90–110 days

25. Average yield of soybean in India is:

A. 10–12 q/ha
B. 15–20 q/ha
C. 25–30 q/ha
D. 35–40 q/ha

✅ Answer: B. 15–20 q/ha

26. Soybean oil content generally ranges between:

A. 10–15%
B. 15–18%
C. 18–22%
D. 25–30%

✅ Answer: C. 18–22%
Explanation: Soybean is an important oilseed crop with oil content around 20%, as per ICAR standards.

27. Protein content in soybean seed is about:

A. 20–25%
B. 30–35%
C. 40–45%
D. 50–55%

✅ Answer: C. 40–45%
Explanation: Soybean is called a “poor man’s meat” due to its high protein content.

28. Harvest index of soybean is approximately:

A. 0.25
B. 0.30
C. 0.40
D. 0.50

✅ Answer: C. 0.40
Explanation: Harvest index indicates efficient partitioning of dry matter to grain.

29. Pod shattering in soybean is mainly due to:

A. Excess rainfall
B. High temperature and delayed harvest
C. Pest attack
D. Nutrient deficiency

✅ Answer: B. High temperature and delayed harvest
Explanation: Over-drying causes pods to split and seeds to fall.

30. Which soil is best suited for soybean cultivation?

A. Sandy soil
B. Saline soil
C. Well-drained loamy soil
D. Waterlogged clay soil

✅ Answer: C. Well-drained loamy soil
Explanation: Soybean is sensitive to waterlogging and prefers good drainage.

31. Optimum soil pH for soybean is:

A. 4.0–5.0
B. 5.0–6.0
C. 6.0–7.5
D. 8.0–9.0

✅ Answer: C. 6.0–7.5
Explanation: Neutral to slightly acidic soils favor nodulation and nutrient uptake.

32. Soybean–wheat is a popular cropping system because:

A. Both are legumes
B. Efficient use of residual moisture
C. Low fertilizer requirement
D. Both mature together

✅ Answer: B. Efficient use of residual moisture
Explanation: Wheat utilizes residual moisture and nutrients after soybean.

33. Soybean fixes atmospheric nitrogen mainly through:

A. Leaves
B. Stem
C. Root nodules
D. Pods

✅ Answer: C. Root nodules
Explanation: Symbiotic Rhizobium bacteria fix nitrogen in root nodules.

34. Maximum nitrogen fixation in soybean occurs during:

A. Early vegetative stage
B. Flowering stage
C. Pod formation stage
D. Maturity stage

✅ Answer: B. Flowering stage
Explanation: Nodulation and nitrogen fixation peak at flowering.

35. Which practice improves nodulation in soybean?

A. High nitrogen dose
B. Rhizobium inoculation
C. Deep sowing
D. Delayed sowing

✅ Answer: B. Rhizobium inoculation
Explanation: Proper inoculation ensures effective symbiosis.

36. Critical weed-free period in soybean is:

A. 0–15 DAS
B. 15–30 DAS
C. 15–45 DAS
D. 45–60 DAS

✅ Answer: C. 15–45 DAS
Explanation: Weed competition during this period causes maximum yield loss.

37. Which intercrop is most compatible with soybean?

A. Rice
B. Maize
C. Pigeonpea
D. Sugarcane

✅ Answer: C. Pigeonpea
Explanation: Soybean + pigeonpea intercropping improves productivity and stability.

38. Soybean seed loses viability quickly mainly due to:

A. Hard seed coat
B. High oil content
C. High protein content
D. Poor embryo

✅ Answer: B. High oil content
Explanation: Oil-rich seeds deteriorate faster during storage.

39. Safe moisture content for soybean seed storage is:

A. 6–7%
B. 8–9%
C. 10–12%
D. 14–15%

✅ Answer: A. 6–7%
Explanation: Low moisture prevents fungal growth and rancidity.

40. Soybean seed is classified as:

A. Orthodox seed
B. Recalcitrant seed
C. Intermediate seed
D. Viviparous seed

✅ Answer: A. Orthodox seed
Explanation: Can be dried to low moisture for storage.

41. Main yield attribute in soybean is:

A. Number of leaves
B. Number of branches
C. Number of pods per plant
D. Plant height

✅ Answer: C. Number of pods per plant
Explanation: Pods directly determine seed yield.

42. Test weight in soybean refers to weight of:

A. 100 seeds
B. 500 seeds
C. 1000 seeds
D. 1 kg seed

✅ Answer: C. 1000 seeds
Explanation: Test weight reflects seed size and quality.

43. Soybean straw is mainly used as:

A. Fuel
B. Bedding material
C. Fodder
D. Green manure

✅ Answer: C. Fodder
Explanation: Soybean straw has good nutritive value.

44. Which nutrient deficiency causes yellowing of young leaves in soybean?

A. Nitrogen
B. Magnesium
C. Iron
D. Potassium

✅ Answer: C. Iron
Explanation: Iron deficiency causes interveinal chlorosis of young leaves.

45. Soybean is most sensitive to waterlogging at:

A. Germination stage
B. Vegetative stage
C. Flowering stage
D. All stages

✅ Answer: D. All stages
Explanation: Waterlogging damages roots and nodules at any stage.

46. Soybean seed rate is increased under:

A. Irrigated condition
B. Rainfed condition
C. Late sowing
D. Early sowing

✅ Answer: C. Late sowing
Explanation: Higher seed rate compensates for reduced branching.

47. Main reason for low soybean yield in India is:

A. Poor varieties
B. Rainfed cultivation
C. Excess fertilizer use
D. High temperature

✅ Answer: B. Rainfed cultivation
Explanation: Yield is limited due to moisture stress and variability.

48. Soybean is harvested when seed moisture is about:

A. 5–7%
B. 8–10%
C. 12–14%
D. 18–20%

✅ Answer: C. 12–14%
Explanation: Ensures minimum shattering and safe storage.

49. Soybean fits best in sustainable agriculture because it:

A. Requires less water
B. Improves soil fertility
C. Needs no fertilizer
D. Grows in all soils

✅ Answer: B. Improves soil fertility
Explanation: Nitrogen fixation enhances soil health.

50. Soybean is known as “Golden Bean” due to its:

A. Colour
B. Oil content
C. Protein and oil richness
D. Export value

✅ Answer: C. Protein and oil richness
Explanation: High nutritional and economic value gives it this name.


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