🔵 1. Maize belongs to which plant family?
A) Fabaceae
B) Solanaceae
C) Poaceae
D) Brassicaceae
Answer: C) Poaceae
Rationale: Maize (Zea mays) is a cereal crop belonging to the grass family, Poaceae.
🔵 2. The scientific name of maize is:
A) Zea mays
B) Triticum aestivum
C) Oryza sativa
D) Hordeum vulgare
Answer: A) Zea mays
Rationale: Zea mays is the botanical name for maize, a globally important cereal crop.
🔵 3. Maize is primarily a:
A) C3 plant
B) CAM plant
C) C4 plant
D) C2 plant
Answer: C) C4 plant
Rationale: Maize uses the C4 photosynthetic pathway, making it efficient in hot climates.
🔵 4. What is the optimum temperature range for maize germination?
A) 10–15°C
B) 18–25°C
C) 30–35°C
D) 35–40°C
Answer: B) 18–25°C
Rationale: Germination in maize is best at moderate warm temperatures.
🔵 5. In maize, the male flower is known as:
A) Silk
B) Ear
C) Tassel
D) Cob
Answer: C) Tassel
Rationale: The tassel is the male part of the maize plant that produces pollen.
🔵 6. The female part of maize is called:
A) Cob
B) Leaf
C) Tassel
D) Husk
Answer: A) Cob
Rationale: The cob or ear is the female inflorescence that bears the grain.
🔵 7. Which nutrient is most critical for kernel development in maize?
A) Potassium
B) Calcium
C) Nitrogen
D) Phosphorus
Answer: C) Nitrogen
Rationale: Nitrogen is essential for protein synthesis and kernel formation.
🔵 8. What is the ideal plant population for maize in 1 hectare under normal conditions?
A) 50,000
B) 66,000
C) 80,000
D) 1,00,000
Answer: B) 66,000
Rationale: A population of 66,000 plants per hectare gives optimum yield with proper spacing.
🔵 9. Which country is the largest producer of maize in the world?
A) China
B) Brazil
C) India
D) USA
Answer: D) USA
Rationale: The USA leads global maize production due to its large area and mechanization.
🔵 10. What is the seed rate for hybrid maize per hectare?
A) 10–15 kg
B) 15–20 kg
C) 20–25 kg
D) 25–30 kg
Answer: B) 15–20 kg
Rationale: Due to large seed size and row spacing, this is the standard seed rate.
🔵 11. Maize is primarily pollinated by:
A) Insects
B) Water
C) Wind
D) Birds
Answer: C) Wind
Rationale: Being monoecious and with exposed flowers, maize is a wind-pollinated crop.
🔵 12. Which of the following is a Kharif maize-growing state in India?
A) Punjab
B) Kerala
C) Rajasthan
D) Maharashtra
Answer: D) Maharashtra
Rationale: Maharashtra is a major Kharif maize-growing state.
🔵 13. What is the ideal spacing for maize under irrigated conditions?
A) 60 × 30 cm
B) 75 × 20 cm
C) 90 × 60 cm
D) 50 × 25 cm
Answer: A) 60 × 30 cm
Rationale: This spacing ensures enough room for growth and nutrient uptake.
🔵 14. Maize is highly sensitive to deficiency of:
A) Magnesium
B) Iron
C) Zinc
D) Copper
Answer: C) Zinc
Rationale: Zinc deficiency in maize causes white striping (interveinal chlorosis) in young leaves.
🔵 15. Which method is most effective for weed control in maize?
A) Hand weeding
B) Intercultivation
C) Herbicide application
D) All of the above
Answer: D) All of the above
Rationale: A combination of manual, mechanical, and chemical methods is best.
🔵 16. Maize crop requires highest amount of water during:
A) Germination
B) Flowering
C) Grain filling
D) Maturity
Answer: B) Flowering
Rationale: Flowering is critical for pollination, and water stress affects yield.
🔵 17. The average duration of a hybrid maize variety is:
A) 50–60 days
B) 70–80 days
C) 90–110 days
D) 120–150 days
Answer: C) 90–110 days
Rationale: Most hybrid maize matures within this duration, depending on region.
🔵 18. A major pest of maize is:
A) Rice stem borer
B) Fall armyworm
C) White grub
D) Aphid
Answer: B) Fall armyworm
Rationale: Fall armyworm (Spodoptera frugiperda) has become a significant pest of maize globally.
🔵 19. Which part of maize is rich in oil?
A) Kernel
B) Husk
C) Bran
D) Germ
Answer: D) Germ
Rationale: The germ of maize seed contains high-quality oil used for cooking.
🔵 20. The growth stage in maize when tassel appears is called:
A) Emergence
B) Vegetative stage
C) Tasseling
D) Silking
Answer: C) Tasseling
Rationale: Tasseling marks the emergence of the male inflorescence.
🔵 21. The physiological maturity in maize is indicated by:
A) Leaf senescence
B) Hard kernel
C) Black layer formation at kernel base
D) Ear drooping
Answer: C) Black layer formation at kernel base
Rationale: A black layer at the base of the grain indicates the cessation of dry matter accumulation.
🔵 22. The major carbohydrate in maize grain is:
A) Glucose
B) Fructose
C) Starch
D) Cellulose
Answer: C) Starch
Rationale: Maize kernels are rich in starch, making it valuable for food and industrial uses.
🔵 23. Maize + Cowpea intercropping system is mainly practiced to improve:
A) Nitrogen fixation
B) Pest resistance
C) Irrigation efficiency
D) Weed control
Answer: A) Nitrogen fixation
Rationale: Legumes like cowpea fix atmospheric nitrogen, improving soil fertility for maize.
🔵 24. In maize, popping ability is highest in which type?
A) Flint corn
B) Dent corn
C) Pop corn
D) Sweet corn
Answer: C) Pop corn
Rationale: Popcorn has hard, dense starch and small kernels that explode upon heating.
🔵 25. Which maize variety is suitable for baby corn production?
A) Ganga-5
B) HQPM-1
C) COBC-1
D) Bio9637
Answer: C) COBC-1
Rationale: COBC-1 is developed for high baby corn yield and early maturity.
🔵 26. Maize can be grown in how many seasons in India?
A) One
B) Two
C) Three
D) Four
Answer: C) Three
Rationale: Maize can be cultivated in Kharif, Rabi, and summer seasons in different regions.
🔵 27. Which is the main disease affecting maize in humid climates?
A) Powdery mildew
B) Leaf blight
C) Rust
D) Smut
Answer: B) Leaf blight
Rationale: Turcicum leaf blight is common under humid conditions, affecting photosynthesis.
🔵 28. What is the chromosome number of maize?
A) 2n = 14
B) 2n = 20
C) 2n = 40
D) 2n = 20
Answer: D) 2n = 20
Rationale: Maize has 10 pairs of chromosomes (diploid number = 20).
🔵 29. The sweet taste in sweet corn is due to high content of:
A) Glucose
B) Sucrose
C) Maltose
D) Sorbitol
Answer: B) Sucrose
Rationale: Sweet corn retains high levels of sucrose before conversion to starch.
🔵 30. Maize requires how much rainfall annually for optimal growth?
A) 200–300 mm
B) 400–600 mm
C) 600–900 mm
D) 1000–1200 mm
Answer: C) 600–900 mm
Rationale: This rainfall range provides adequate moisture for maize development.
🔵 31. The critical stage of water requirement in maize is:
A) Seedling
B) Tasseling and silking
C) Maturity
D) Germination
Answer: B) Tasseling and silking
Rationale: Water stress at this stage affects pollination and grain setting.
🔵 32. The nutrient applied as basal dose in maize is:
A) Nitrogen
B) Potassium
C) Phosphorus
D) Sulphur
Answer: C) Phosphorus
Rationale: Phosphorus aids root development and is placed as basal dose for uptake.
🔵 33. Lodging in maize is commonly due to:
A) Heavy irrigation
B) Weak stalk strength
C) Low temperature
D) Pest attack
Answer: B) Weak stalk strength
Rationale: Tall plants and high nitrogen promote weak stalks prone to lodging.
🔵 34. Which micronutrient is often deficient in maize, causing white stripes on leaves?
A) Iron
B) Zinc
C) Manganese
D) Boron
Answer: B) Zinc
Rationale: Zinc deficiency leads to interveinal chlorosis and growth stunting in maize.
🔵 35. The best soil for maize cultivation is:
A) Sandy
B) Clayey
C) Loamy
D) Saline
Answer: C) Loamy
Rationale: Well-drained loamy soils with good fertility support high maize yields.
🔵 36. “HQPM” in HQPM-1 variety stands for:
A) High Quality Product Maize
B) High Quantity Protein Maize
C) High Quality Protein Maize
D) Hybrid Quality Protein Maize
Answer: C) High Quality Protein Maize
Rationale: HQPM refers to maize varieties rich in lysine and tryptophan.
🔵 37. Which insect pest damages maize roots?
A) Corn borer
B) White grub
C) Aphids
D) Stem fly
Answer: B) White grub
Rationale: White grubs feed on roots, causing plant wilting and reduced stand.
🔵 38. Shelling percentage in maize is generally:
A) 50–55%
B) 60–65%
C) 70–75%
D) 80–85%
Answer: C) 70–75%
Rationale: It refers to grain recovery after shelling from the cob.
🔵 39. Which maize type is mostly used for biofuel production?
A) Sweet corn
B) Dent corn
C) Pop corn
D) Waxy corn
Answer: B) Dent corn
Rationale: Dent corn has high starch content, suitable for ethanol production.
🔵 40. Male sterility in maize breeding helps in:
A) Yield reduction
B) Cross-pollination
C) Pest resistance
D) Delayed maturity
Answer: B) Cross-pollination
Rationale: Male sterility eliminates self-pollination and ensures hybrid seed production.
🔵 41. Which Indian institute is known for maize research?
A) IARI
B) IIHR
C) IIMR
D) IIPR
Answer: C) IIMR
Rationale: Indian Institute of Maize Research (IIMR) leads maize research in India.
🔵 42. Maize is believed to have originated in:
A) India
B) Africa
C) Central America
D) China
Answer: C) Central America
Rationale: Archaeological evidence supports Central America (Mexico) as its center of origin.
🔵 43. The process of removing maize kernels from the cob is called:
A) Decortication
B) Winnowing
C) Shelling
D) Milling
Answer: C) Shelling
Rationale: Shelling is the mechanical separation of kernels from cob.
🔵 44. Which maize type has soft starch and hard outer layer?
A) Flint corn
B) Dent corn
C) Sweet corn
D) Flour corn
Answer: A) Flint corn
Rationale: Flint corn has a hard outer endosperm layer, making it less prone to cracking.
🔵 45. Stalk rot in maize is caused by:
A) Fusarium spp.
B) Phytophthora spp.
C) Alternaria spp.
D) Xanthomonas spp.
Answer: A) Fusarium spp.
Rationale: Fusarium causes rotting of stem tissues, weakening the plant.
🔵 46. The standard moisture content for maize grain storage is:
A) 10%
B) 13%
C) 18%
D) 20%
Answer: B) 13%
Rationale: Safe storage requires drying the grain to 13% moisture to prevent fungal growth.
🔵 47. Hybrid maize varieties are superior due to:
A) Uniform color
B) Heterosis (hybrid vigor)
C) High sugar content
D) Dwarf height
Answer: B) Heterosis (hybrid vigor)
Rationale: Hybrids yield more due to increased vigor from genetic diversity.
🔵 48. One quintal of hybrid maize seed is sufficient for how much area?
A) 0.5 ha
B) 1 ha
C) 1.5 ha
D) 2 ha
Answer: B) 1 ha
Rationale: With proper spacing and seed rate (15–20 kg/ha), one quintal suffices for 1 ha.
🔵 49. Baby corn is harvested at what stage?
A) Milk stage
B) Dough stage
C) Silking stage
D) Before fertilization
Answer: D) Before fertilization
Rationale: Baby corn is immature cob harvested before pollination to retain tenderness.
🔵 50. In maize, nitrogen is generally applied in how many splits?
A) 1
B) 2
C) 3
D) 4
Answer: C) 3
Rationale: Nitrogen is given in 3 splits: basal, knee-high, and tasseling for efficient uptake.
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