Agriculture 2024 Paper II 50 marks 150 words Compulsory Explain

Q1

Answer the following questions in about 150 words each: (a) Explain the ultrastructure of chloroplast with the help of diagram. Briefly discuss the chemical composition and functions of chloroplast in higher plants. (10 marks) (b) Describe the latest advances in biotechnology for crop improvement. (10 marks) (c) Describe different approaches for improving the characteristics of inbred lines. (10 marks) (d) Discuss various tests undertaken in seed testing laboratories. (10 marks) (e) Discuss various theories of ion uptake with respect to passive absorption. (10 marks)

हिंदी में प्रश्न पढ़ें

निम्नलिखित प्रत्येक प्रश्न का उत्तर लगभग 150 शब्दों में दीजिए : (a) हरितलवक की अतिसूक्ष्म संरचना की चित्र की सहायता से व्याख्या कीजिए। उच्च पौधों में हरितलवक की रासायनिक संरचना और कार्यों की संक्षेप में विवेचना कीजिए। (10 अंक) (b) फसल सुधार के लिए जैव प्रौद्योगिकी में नवीनतम प्रगतियों का वर्णन कीजिए। (10 अंक) (c) अंतःप्रजात वंशजों के अभिलक्षणों में सुधार के लिए विभिन्न दृष्टिकोणों का वर्णन कीजिए। (10 अंक) (d) बीज परीक्षण प्रयोगशालाओं में होने वाले विभिन्न परीक्षणों की चर्चा कीजिए। (10 अंक) (e) निष्क्रिय अवशोषण के संबंध में आयन अंतर्ग्रहण के विभिन्न सिद्धांतों का वर्णन कीजिए। (10 अंक)

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Directive word: Explain

This question asks you to explain. 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 'explain' demands clear, logical exposition of concepts with causal linkages. Allocate approximately 30 words per mark across five sub-parts: spend ~30 words on (a) chloroplast ultrastructure with diagram description, ~30 words each on (b) biotech advances and (c) inbred line improvement, ~30 words on (d) seed testing protocols, and ~30 words on (e) ion uptake theories. Structure each sub-part as: definition → key components/processes → function/significance. No conclusion needed; maximize content density within word limits.

Key points expected

  • (a) Chloroplast: Double membrane envelope, thylakoid system (grana and stroma lamellae), stroma with ribosomes, DNA, and enzymes; chemical composition (chlorophylls a/b, carotenoids, lipids, proteins); functions (photosynthesis—light reactions in thylakoids, Calvin cycle in stroma, starch/fatty acid synthesis)
  • (b) Biotechnology advances: CRISPR-Cas9 gene editing, marker-assisted selection (MAS), genomic selection, RNA interference, synthetic biology, speed breeding, haploid doubled haploid (DH) technology, and GM crops with stacked traits
  • (c) Inbred line improvement: Conventional pedigree selection, backcross breeding, recurrent selection, use of cytoplasmic male sterility (CMS) systems, doubled haploid technology for instant homozygosity, and molecular marker-assisted introgression of desirable alleles
  • (d) Seed testing: Purity analysis (physical and genetic), germination testing (standard and accelerated aging), vigour testing (electrical conductivity, tetrazolium test), moisture content determination, and seed health testing (blotter/agar methods for pathogens)
  • (e) Ion uptake theories: Passive absorption explained via Donnan equilibrium (fixed anions in cell wall creating electrical gradient), ion exchange (root surface cation exchange capacity), and mass flow/diffusion along electrochemical potential gradient without metabolic energy

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Scientifically accurate across all five sub-parts: correctly identifies thylakoid membrane organization in (a), distinguishes CRISPR from traditional transgenics in (b), clarifies homozygosity fixation in DH technology for (c), differentiates genetic vs physical purity in (d), and correctly applies electrochemical potential gradient concept for (e)Generally correct but with minor errors: vague on stroma vs grana functions in (a), conflates MAS with genetic modification in (b), unclear on recurrent selection mechanics in (c), mixes vigour with viability in (d), or confuses passive with active transport in (e)Major conceptual errors: single membrane chloroplast in (a), outdated biotech examples only in (b), no understanding of inbreeding depression in (c), omits germination testing in (d), or describes active transport mechanisms for passive absorption in (e)
Quantitative reasoning10%5Includes precise quantitative data where relevant: chlorophyll a:b ratio (~3:1), germination percentage thresholds (ISTA standards), or Donnan equilibrium mathematical relationship; demonstrates proportional reasoning in word allocation across sub-partsMentions quantitative terms without precision (e.g., 'high germination rate', 'more chlorophyll a'); shows awareness of numerical standards but lacks specificityCompletely avoids quantitative aspects; no mention of percentages, ratios, or measurable standards; disproportionate word allocation (e.g., 100 words on one sub-part, neglecting others)
Indian context examples15%7.5Cites India-specific developments: Bt cotton (first commercialized GM crop), ICAR's National Institute of Plant Genome Research (NIPGR) work on CRISPR rice, maize DH lines from ICAR-IIMR, Central Seed Testing Laboratory (CSTL) network under Seeds Act 1966, or ICAR-IISS research on nutrient use efficiencyGeneric references to 'Indian agriculture' or 'government schemes' without specific institutions, crops, or policy instruments; mentions Bt cotton without contextNo Indian examples; entirely foreign-centric (Monsanto, Pioneer) or completely omits geographical context despite multiple entry points
Diagram / process25%12.5For (a), describes clear diagram with labeled components (outer/inner membrane, intermembrane space, thylakoid lumen, stroma); for other parts, presents stepwise processes: CRISPR mechanism, DH production protocol, seed testing sequence, or ion exchange sequence at root surfaceMentions 'diagram' for (a) but provides incomplete description; lists processes as bullet points without sequential logic; describes components without spatial organizationOmits diagram description entirely for (a); no process flow in any sub-part; random fact listing without structural coherence
Policy / extension angle25%12.5Connects to regulatory frameworks: EPA guidelines for GM crops, Seeds Act 1966 and 2019 amendments for seed testing, PPV&FR Act for inbred line protection, or nutrient-based subsidy (NBS) policy linking to ion uptake efficiency; mentions ICAR-STATE Agricultural Universities extension linkageBrief mention of 'government support' or 'farmers benefit' without specific policy instruments; generic reference to 'seed certification' without legal frameworkNo policy or extension context; purely technical description without application to Indian agricultural governance, farmer adoption, or regulatory systems

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