कृषि, पशु र वन विज्ञान प्रवेश

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

381. The reaction between magnesium ribbon and oxygen gas produces magnesium oxide. This is an example of:

     कReduction खOxidation गNeutralization घDecomposition
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382. A farmer applies a nitrogen-based fertilizer to their field. Over time, the fertilizer breaks down into ammonia (NH₃). What is the primary reason ammonia escapes into the atmosphere?

     कAmmonia has a high boiling point खAmmonia readily reacts with soil minerals गAmmonia is highly soluble in water घAmmonia is volatile and possesses a low boiling point
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383. A compound has the following percentage composition: Carbon - 40%, Hydrogen - 6.7% and Oxygen - 53.3%. If its molar mass is 98 g/mol, what is its empirical formula?

     कCH₄ खC₂H₆O गC₃H 8O घC₄H₁₀O
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384. The oxidation state of manganese (Mn) in KMnO₄ is +7. What is the oxidation state of oxygen (O) in this compound?

     क+2 ख+5 ग-2 घ+3
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385. The chemical formula for glucose (शुर्कित खुजली) is C₆H₁₂O₆. What is the valency of carbon in this molecule? (C₆H₁₂O₆ को रासायनिक सूत्र कार्बन अणुमा यसको क्यावेलिटी के हो?

     क+2 ख+3 ग+4 घ+5
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386. The cultivation of rice in Nepal's terraced landscapes is intrinsically linked to soil conservation. Why is this so?

     कa) Terraces create a microclimate that reduces evaporation खb) Terraces promote water infiltration and reduce soil erosion गc) Terraces increase the rate of nutrient decomposition in the soil घd) Terraces primarily serve as aesthetic features with no impact on soil health
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387. The ‘National Forest Policy’ of Nepal emphasizes sustainable forest management. What is a central focus within this policy regarding reforestation efforts?

     कa) Planting exclusively coniferous tree species like Pinus wallichiana खb) Utilizing native tree species adapted to local conditions and ecosystems गc) Prioritizing the plantation of fast-growing exotic trees for timber production घd) Focusing solely on planting trees in areas with high rainfall
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388. Nepal’s forestry sector has been significantly influenced by the ‘Community Forestry Programme’. Which of the following best describes a key objective of this programme?

     कa) Strict state control over all forest resources खb) Empowering local communities to manage and benefit from forests गc) Prioritizing timber production for export revenue घd) Focusing solely on reforestation of degraded lands
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389. The practice of ‘slash and burn’ agriculture, prevalent in many parts of Nepal, poses a significant risk to soil fertility primarily because it:

     कa) Increases soil erosion due to removal of vegetation cover खb) Reduces the uptake of nutrients by plant roots गc) Introduces excessive amounts of lime into the soil घd) Enhances the decomposition rate of organic matter
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390. Which of the following is a major threat to forest biodiversity in Nepal’s protected areas, primarily due to human activities?

     कa) Increased rainfall patterns खb) Invasive plant species like Lantana camara गc) Volcanic activity घd) Rising global temperatures
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