Crop Production
📌 Instructions:
• Total Questions: 60
• Time: 40 Minutes
• Each question compulsory
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Agronomy Part 5 (Unit 10—Crops)
Topic—Barley, Maize, Bajra, Jowar, Sugarcane, Chickpea
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1. The recommended number of three-budded setts required per hectare in sugarcane cultivation is approximately:
About 35,000–40,000 three-budded setts per hectare are required, usually obtained from 75–80 quintals of cane.
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2. Striga spp. is a serious problem in sorghum and pearl millet because it is:
Striga is a partial root parasite that attaches to host roots and extracts nutrients, severely reducing yield.
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3. In barley, which group does not bear awns or hoods on lemma?
In H. irregular, the lemma does not bear awns or hoods, which differentiates it from H. vulgare where florets are awned or hooded.
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4. The major industrial use of barley grain is for production of:
Barley grains are primarily used for malt production, which is utilized in breweries for making beer, alcohol, vinegar, and yeast.
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5. Chickpea has which type of root system?
Chickpea possesses a well-developed tap root system.
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6. Barley is comparatively more tolerant to which soil condition than other cereals?
Barley has higher tolerance to saline and alkali soils compared to other cereal crops, making it suitable for marginal lands.
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7. The major storage protein of maize is ‘zein’, which is deficient in:
Maize protein ‘zein’ is deficient in lysine and tryptophan, making maize nutritionally poor in essential amino acids.
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8. The sour taste of chickpea leaves and pods is mainly due to the presence of:
The sour taste is due to malic acid (90–96%) and oxalic acid (4–10%).
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9. In sugarcane cultivation, the recommended row-to-row spacing is:
The recommended spacing between rows in sugarcane is 90 cm for proper growth and management.
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10. In sugarcane, the maximum water requirement occurs during which stage?
The formative phase (60–130 DAP) has the maximum water requirement in sugarcane.
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11. The critical stage for moisture and nutrient requirement in maize occurs between:
The period between tasseling and silking is the most critical stage for moisture and nutrients in maize, directly influencing pollination and yield.
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12. In maize, the terminal male inflorescence is called:
The terminal male flower cluster in maize is called tassel. It is a branched panicle bearing pollen (staminate inflorescence).
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13. Who proposed the use of the double cross technique for hybrid seed production in maize (1920)?
D.F. Jones (1920) proposed the double cross technique for hybrid seed production, which later became widely used, especially in India.
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14. The maize type used chiefly for starch production, having a two-layered endosperm, is:
Waxy corn (Zea mays ceratina) has a two-layered endosperm and is mainly used for starch production.
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15. Which sugarcane species is known as Indian cane and is characterized by low sucrose and high fiber content?
Saccharum barberi (Indian cane) has low sucrose, high fiber content, and short, thin stalks.
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16. The concept of crop logging in sugarcane was developed by:
The concept of crop logging in sugarcane was developed by H.F. Clements in Hawaii.
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17. The chemical used for nipping in gram is:
TIBA (Tri-iodo benzoic acid) @ 75 ppm is used for chemical nipping in gram.
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18. The optimum sowing time of gram in North India is:
The ideal sowing window for gram is 15 October to 20 October to ensure proper growth and avoid frost damage.
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19. In maize, whitening of apical leaves (“White bud”) is due to deficiency of:
Zinc deficiency in maize causes “white bud” symptom, where apical leaves turn white due to impaired chlorophyll formation.
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20. Which type of maize has kernels that appear like a tooth and is extensively grown in the USA?
Dent corn (Zea mays indentata) has a tooth-like indentation on the kernel and is extensively grown in the USA.
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21. Phosphorus deficiency in maize is characterized by:
Phosphorus deficiency leads to stunted growth, purplish coloration of leaf tips and margins, and abnormally dark green leaves.
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22. Grassy shoot (Albino) disease of sugarcane is associated with:
Grassy shoot disease is caused by phytoplasma, leading to excessive tillering and pale shoots.
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23. In the Fehling test for sugarcane maturity, the glucose percentage should be:
For proper maturity, the Fehling test solution reading should indicate less than 0.5% glucose.
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24. Optimum plant population of maize in Kharif season is approximately:
The recommended optimum plant population for Kharif maize is 65,000–70,000 plants per hectare to achieve better productivity
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25. Which statement regarding Hordeum distichon is correct?
H. distichon is strictly two-rowed barley and only the central spikelet is fertile, while lateral spikelets are sterile.
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26. The most common method of irrigation in sugarcane is:
Furrow irrigation is the most commonly practiced irrigation method in sugarcane cultivation.
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27. Kabuli gram differs from desi gram mainly because it has:
Kabuli gram has bold, attractive white seeds and higher test weight (340–375 g) compared to desi gram.
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28. Red rot of sugarcane, characterized by reddening of the stem pith, is caused by:
Red rot is caused by Colletotrichum falcatum and shows characteristic reddening of the stem pith.
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29. The wild species of sugarcane is:
Saccharum spontaneum is the wild species of sugarcane.
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30. In pearl millet, the supportive roots emerging from the second and third nodes are known as:
Prop or brace roots arise from the lower nodes and provide mechanical support to the plant.
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31. Which type of seed bed is recommended for chickpea cultivation?
Chickpea requires a cloddy and rough seed bed to ensure proper aeration, as it is highly sensitive to poor soil aeration.
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32. Which of the following correctly describes Hordeum vulgare under varietal classification of barley?
Hordeum vulgare is six-rowed barley in which all three spikelets at each node are fertile, forming six distinct rows around the rachis.
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33. Among cereals, the highest mineral content (about 2.7%) is found in:
Pearl millet (bajra) has the highest mineral content (around 2.7%) among cereals, making it nutritionally rich.
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34. Delayed sowing in gram increases the incidence of:
Late sowing increases infestation of pod borer (Helicoverpa armigera), leading to heavy yield loss.
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35. Ratooning Stunting Disease (RSD) of sugarcane is caused by:
Ratooning Stunting Disease (RSD) is caused by Clavibactor xyli, a bacterial pathogen affecting vascular tissues.
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36. The recommended seed rate for gram cultivation is:
Recommended seed rate for gram is 80–100 kg per hectare for optimum plant population.
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37. The average yield of gram under irrigated conditions is:
Under proper irrigated management, gram yields about 20–25 quintals per hectare.
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38. The best variety of gram recommended for dry land conditions is:
C-235 is widely adopted for dry land and is tolerant to Ascochyta blight.
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39. Sugarcane is considered mature when the refractometer (Brix) reading is:
Sugarcane is considered mature when the Brix value ranges between 16–18, measured from juice taken from the middle portion of the stalk.
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40. The inflorescence of sugarcane is known as:
The inflorescence of sugarcane is called an “Arrow.”
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41. Chickpea is classified as which type of plant based on photosynthetic pathway?
Chickpea is a C₃ plant and performs photosynthesis through the C₃ pathway
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42. Maize is known as the “Queen of Cereals” primarily because it:
Maize possesses the highest yield potential among cereals, which is why it is popularly called the “Queen of Cereals” in agronomy.
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43. Gasohol used in automobiles is a mixture of:
Gasohol is prepared by mixing 80% petrol with 20% alcohol (ethanol derived from sugarcane) and is used as automobile fuel.
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44. Nipping (topping) in gram is generally practiced at:
Nipping is done at 50–60 days after sowing to encourage branching and reproductive growth.
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45. “Dead heart” symptom in sugarcane is mainly caused by:
Shoot borer (Chilo infuscatellus) damages the growing point and produces the typical “dead heart” symptom.
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46. The commonly used herbicide in maize at 0.5–1.0 kg dose is:
Simazine (0.5–1.0 kg) as the commonly used herbicide in maize cultivation.
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47. Which of the following statements about maize is correct?
Maize is a monoecious plant (separate male and female inflorescences on same plant) and is predominantly cross-pollinated due to wind pollination.
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48. According to classification based on endosperm characters, which type of maize is scientifically known as Zea mays indurata?
Flint corn (Zea mays indurata) has hard and smooth kernels and is commonly cultivated in India.
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49. Adsali planting of sugarcane is generally done in:
Adsali planting is done in June–July and takes 15–18 months for harvesting, commonly practiced in Maharashtra (South India).
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50. Higher dose of nitrogen during ripening stage results in:
Excess nitrogen during ripening decreases sucrose content in sugarcane.
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51. The most critical stage for irrigation in sugarcane is:
The formative stage is the most critical stage for irrigation due to maximum water requirement.
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52. Maize is particularly sensitive to which of the following conditions?
maize is particularly sensitive to water logging, which adversely affects root respiration and plant growth.
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53. The most critical stages of irrigation in gram are:
Pre-flowering and pod development are the most sensitive stages for moisture stress in gram.
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54. The botanical name of Bengal Gram is:
Chickpea/Bengal gram is botanically known as Cicer arietinum.
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55. The first inter-specific hybridization for development of Napier grass (Pusa Napier-1) was carried out between:
The first inter-specific hybridization (1947) for Napier grass involved Pennisetum purpureum × Pennisetum glaucum, leading to improved forage types.
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56. The first double cross hybrids released in India (1961) under AICRP on maize included:
In 1961, four double cross hybrids—Ganga-1, Ganga-101, Deccan, and Ranjeet—were released under the All India Coordinated Research Project on Maize.
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57. Saccharum officinarum is commonly known as:
Saccharum officinarum is called Noble cane. It is a tropical cane with thick, juicy stalks and low fiber content (2n = 80).
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58.
Chickpea is highly susceptible to frost at which stage?
Chickpea is highly sensitive to frost during the flowering stage, which can severely reduce yield.
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59. Sorghum is called a “camel crop” mainly due to its:
Sorghum is termed a “camel crop” because of its excellent drought resistance, enabling it to thrive in arid regions.
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60. The first hybrid of sorghum released in India (1964) was:
CSH-1 was the first sorghum hybrid released in 1964 and marked the beginning of hybrid sorghum cultivation.
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