Agriculture 2022 Paper I 50 marks Discuss

Q4

(a) Discuss about the types of herbicide resistance in weeds with specific example in Indian perspective. Discuss the management practices dealing with herbicide resistance in weeds. (20 marks) (b) Why do we consider soil structure an important soil property for crop production ? How is soil structure changed by various factors ? (20 marks) (c) Describe various components of agroforestry and state the benefits of agroforestry also. (10 marks)

हिंदी में प्रश्न पढ़ें

(a) खरपतवारों में शाकनाशी प्रतिरोध (हर्बिसाइड रेजिस्टेंस) के प्रकारों की चर्चा भारतीय परिप्रेक्ष्य में विशिष्ट उदाहरण के साथ करें । खरपतवारों में शाकनाशी प्रतिरोध के प्रबंधन के तरीकों की विवेचना कीजिए । (20 अंक) (b) फसल उत्पादन के लिये मृदा संरचना को एक महत्वपूर्ण मृदा गुण क्यों माना जाता है ? मृदा संरचना विभिन्न कारकों से कैसे बदलती है ? (20 अंक) (c) कृषि वानिकी के विभिन्न घटकों का वर्णन करें एवं कृषि वानिकी के लाभों का भी उल्लेख करें । (10 अंक)

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Directive word: Discuss

This question asks you to discuss. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'discuss' demands a comprehensive, analytical treatment with balanced coverage across all three sub-parts. Allocate approximately 40% of word budget to part (a) given its 20 marks and dual demand (types + management), 40% to part (b) for its explanatory depth requirement, and 20% to part (c). Structure with a brief integrated introduction, three distinct sectional bodies addressing each sub-part sequentially, and a concluding synthesis on sustainable agriculture integration.

Key points expected

  • Part (a): Classification of herbicide resistance mechanisms—target-site resistance (TSR), non-target-site resistance (NTSR/metabolic), and cross-resistance vs. multiple resistance; specific Indian examples like Phalaris minor resistance to isoproturon in wheat belt of Punjab-Haryana, Echinochloa spp. resistance to butachlor in rice
  • Part (a): Integrated resistance management—herbicide rotation, tank mixes, sequential application, non-chemical tactics (crop rotation, stale seedbed, competitive cultivars), and HRAC mode-of-action grouping
  • Part (b): Soil structure significance—porosity for root penetration, water retention vs. drainage balance, aeration for microbial activity, resistance to erosion; distinction from soil texture
  • Part (b): Factors modifying soil structure—biotic (root exudates, earthworms, microbial polysaccharides), abiotic (wetting-drying cycles, freezing-thawing, tillage intensity, compaction from heavy machinery, sodium saturation affecting dispersion)
  • Part (c): Agroforestry components—woody perennials (trees/shrubs), herbaceous crops/pasture, livestock (silvopastoral), plus associated biota; classification into agrisilviculture, silvopasture, agrosilvopasture, multipurpose tree production
  • Part (c): Ecosystem services—carbon sequestration (CDM projects), biodiversity corridors, microclimate moderation, nutrient cycling through litterfall, economic diversification (NTFPs, timber), and alignment with NAPCC and National Agroforestry Policy 2014

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Demonstrates precise scientific understanding across all parts: for (a) correctly distinguishes TSR (ALS-inhibitor resistance in Parthenium) from NTSR (cytochrome P450-mediated enhanced metabolism); for (b) accurately defines soil structure hierarchy (ped > aggregate > primary particle) and distinguishes structure from texture; for (c) correctly classifies agroforestry systems by component interaction intensityShows generally correct concepts with minor errors—may confuse cross-resistance with multiple resistance, conflate soil structure with texture, or list agroforestry components without systematic classificationFundamental conceptual errors—misidentifies resistance mechanisms, describes only soil texture under structure, or conflates agroforestry with social forestry or farm forestry
Quantitative reasoning15%7.5Integrates relevant quantitative data: for (a) cites resistance frequency thresholds (e.g., >30% survival at 2X recommended dose) or economic losses from resistant weeds in India (~$11 billion annual crop loss estimate); for (b) references ideal bulk density ranges (1.1-1.4 g/cm³ for loam), porosity percentages, or soil organic carbon thresholds; for (c) cites carbon sequestration rates (2-5 Mg C/ha/year) or agroforestry coverage statisticsMentions some numerical data but lacks precision or context—round figures without units, or generic global statistics without Indian relevanceCompletely qualitative treatment with no quantitative anchoring, or incorrect/made-up figures
Indian context examples25%12.5Rich, geographically specific Indian evidence: for (a) details Phalaris minor-isoproturon resistance evolution in Indo-Gangetic Plains since 1990s, Chenopodium album resistance in mustard, or Echinochloa glabrescens in Tamil Nadu rice; for (b) references black cotton soil structure degradation in Maharashtra, sodic soil reclamation in Uttar Pradesh, or conservation tillage in rice-wheat systems; for (c) cites specific systems—poplar-based agroforestry in Punjab, Prosopis cineraria in Rajasthan, or coffee-shade systems in KodaguSome Indian examples but limited specificity—mentions 'weeds in Punjab' or 'agroforestry in India' without naming species, locations, or policiesGeneric or foreign examples dominate (US glyphosate resistance, Midwest no-till), or complete absence of Indian context
Diagram / process20%10Includes well-labelled, relevant diagrams: for (a) schematic of resistance mechanism (modified ALS enzyme binding site); for (b) soil profile showing aggregate hierarchy, or diagram of wetting-drying cycle effects on structure; for (c) agroforestry system architecture (canopy strata, root zone complementarity). Alternatively, clear flowcharts for resistance management decision-tree or soil structure formation processesMentions diagrams but poorly executed, or describes processes verbally without visual representation; diagrams present but missing key labelsNo diagrams or schematic representations; purely textual description of spatial/structural relationships
Policy / extension angle15%7.5Integrates policy and extension relevance: for (a) references ICAR-AICRP-Weed Management, HRAC India guidelines, or state-level resistance monitoring; for (b) connects to Soil Health Card Scheme, National Mission for Sustainable Agriculture, or watershed development programs; for (c) discusses National Agroforestry Policy 2014, Tree Patta rights, MGNREGA integration, or carbon credit mechanisms for agroforestryBrief mention of one or two policies without elaboration, or generic reference to 'government schemes' without specificityNo policy or extension dimension; purely academic/scientific treatment without implementation relevance

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