कृषि र वन सामान्य ज्ञान – Agriculture & Forestry GK MCQ
कृषि र वन सामान्य ज्ञान – कृषि/वन प्रवेश
Agriculture & Forestry GK · Agriculture, Veterinary & Forestry Entrance · ३९३ प्रश्न
३९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि र वन सामान्य ज्ञान: 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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Hybrid vigour, the superiority of an F1 hybrid over its parents, is called:
सही उत्तर: घ) heterosis
Heterosis is the reason farmers buy fresh hybrid seed every season. Inbreeding depression is the opposite effect, a loss of vigour from repeated selfing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which crop is predominantly cross-pollinated?
सही उत्तर: ग) Maize
Maize has separate male (tassel) and female (silk) flowers, which favours cross-pollination. Wheat, rice and barley are mainly self-pollinated.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which plant hormone promotes ripening of fruits?
सही उत्तर: ख) Ethylene
Ethylene is a gaseous hormone that triggers ripening, which is why calcium carbide or ethephon is used for artificial ripening. Gibberellins are mainly known for stem elongation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a C4 plant?
सही उत्तर: क) Maize
Maize, sugarcane and sorghum are C4 plants with Kranz anatomy and efficient photosynthesis under high light and temperature. Wheat, rice and soybean are C3 plants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pink colour of active legume root nodules is due to:
सही उत्तर: घ) leghaemoglobin
Leghaemoglobin binds oxygen and protects the oxygen-sensitive enzyme nitrogenase inside the nodule. Nodules that are not fixing nitrogen are usually white or green.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Azolla is used as a biofertilizer in rice fields because it lives in symbiosis with the nitrogen-fixing cyanobacterium:
सही उत्तर: ग) Anabaena azollae
The water fern Azolla hosts Anabaena azollae in its leaf cavities, which fixes atmospheric nitrogen. Frankia fixes nitrogen with non-legume trees such as alder.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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