कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४९३ प्रश्न
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन प्रवेश: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The conversion of ammonium to nitrate by soil bacteria is called:
सही उत्तर: ख) nitrification
In nitrification, Nitrosomonas oxidises ammonium to nitrite and Nitrobacter oxidises nitrite to nitrate. Denitrification is the reverse loss of nitrate as nitrogen gas.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a soil profile, the C horizon mainly consists of:
सही उत्तर: क) partly weathered parent material
The C horizon is weathered parent material lying above bedrock. Accumulation of leached clay, iron and aluminium happens in the B horizon.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Most field crops grow best in soils with a pH of about:
सही उत्तर: घ) 6.5 to 7.5
Near-neutral pH (about 6.5-7.5) gives the best availability of most plant nutrients. Strongly acidic or alkaline soils lock up nutrients such as phosphorus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sodic (alkali) soils are commonly reclaimed by applying:
सही उत्तर: ग) gypsum
Gypsum (CaSO4·2H2O) supplies calcium that replaces exchangeable sodium, which is then leached away. Lime is used for acidic soils, not sodic soils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Acidic soils are commonly corrected by applying:
सही उत्तर: ख) agricultural lime
Lime (calcium carbonate) neutralises soil acidity and raises pH. Sulphur and ammonium sulphate make soil more acidic, while gypsum is used for sodic soils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How much P2O5 is supplied by 150 kg of DAP (18-46-0)?
सही उत्तर: क) 69 kg
P2O5 = 150 x 0.46 = 69 kg. 27 kg is the nitrogen supplied (150 x 0.18).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many kg of urea (46% N) are needed to supply 92 kg of nitrogen?
सही उत्तर: घ) 200 kg
Urea needed = 92 / 0.46 = 200 kg. Using 100 kg would supply only 46 kg N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nutrient grade of diammonium phosphate (DAP) is:
सही उत्तर: ग) 18-46-0
DAP contains 18% N and 46% P2O5. 46-0-0 is urea, 0-0-60 is muriate of potash, and about 0-16-0 is single super phosphate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Muriate of potash (MOP) is chemically:
सही उत्तर: ख) potassium chloride (KCl)
Muriate of potash is potassium chloride, containing about 60% K2O. 'Muriate' is an old term for chloride.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Interveinal chlorosis appearing first on the youngest leaves is typical of deficiency of:
सही उत्तर: क) iron
Iron is immobile in plants, so its deficiency shows on new leaves as yellowing between green veins. Nitrogen and magnesium are mobile, so their deficiency appears first on older leaves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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