Agriculture 2025 Paper II 50 marks Explain

Q2

(a) Explain mutagenesis with its classification. Discuss briefly the mechanisms of action of alkylating agents and azide mutagens in crop improvement. (20 marks) (b) Give an account on double haploid and its applications in plant breeding. Also discuss the production methods of haploid. (20 marks) (c) What do you mean by Intellectual Property? Discuss the protection of Intellectual Property Rights in reference to patent, plant breeders' rights and copyright. (10 marks)

हिंदी में प्रश्न पढ़ें

(a) उत्परिवर्तजन (म्यूटाजेनेसिस) को इसके वर्गीकरण के साथ समझाइए। फसल सुधार में एल्काइलेटिंग एजेंटों तथा एजाइड म्यूटाजेंस की क्रिया प्रणाली का संक्षेप में वर्णन कीजिए। (20 अंक) (b) दोहरे अगुणित (डबल हैप्लॉइड) और पादप प्रजनन में इसके अनुप्रयोगों का विवरण दीजिए। अगुणित की उत्पादन विधियों की भी विवेचना कीजिए। (20 अंक) (c) बौद्धिक सम्पदा से आप क्या समझते हैं ? पेटेंट, पादप प्रजनकों के अधिकारों तथा कॉपीराइट के संदर्भ में बौद्धिक सम्पदा अधिकारों के संरक्षण की विवेचना 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 conceptual clarity with cause-effect linkages. Structure: brief intro on induced mutagenesis relevance → Part (a): 40% weight (8-10 marks equivalent) covering physical/chemical mutagen classification, alkylating agents (EMS, MMS) mechanism of base substitution, and azide (NaN3) inhibition of DNA synthesis → Part (b): 40% weight on haploid definition, anther culture/microspore culture methods, chromosome doubling techniques, and applications in instant homozygosity and mutation studies → Part (c): 20% weight defining IP, then comparing patent (novelty, non-obviousness, utility), PBR (UPOV criteria, farmer's privilege), and copyright for software/training materials → conclude with India's PPV&FR Act 2001 significance. Spend ~35 minutes on (a), ~35 on (b), ~20 on (c).

Key points expected

  • Part (a): Classification of mutagenesis into physical (ionizing: X-rays, gamma rays; non-ionizing: UV) and chemical (alkylating agents, base analogues, intercalating agents); mechanism of alkylating agents causing O6-alkylguanine mispairing leading to GC→AT transitions; azide mutagen mechanism involving respiratory inhibition and DNA replication errors
  • Part (a): Specific examples like EMS (ethyl methanesulfonate) inducing point mutations in rice; sodium azide in barley and sorghum mutagenesis programs
  • Part (b): Definition of doubled haploid (DH) as homozygous lines derived from haploid embryos; production methods including anther/microspore culture, wide hybridization (bulbosum technique in barley), chromosome elimination (maize × haploid inducer stock), and ovary/ovule culture
  • Part (b): Applications: instant fixation of recombinants, selection efficiency for recessive traits, reverse breeding, mutation studies, and hybrid seed production (e.g., maize inbred development); Indian examples: DH lines in rice (CRRI, Cuttack), wheat (IIWBR, Karnal)
  • Part (c): Intellectual Property definition as intangible creations of mind; Patent protection under Indian Patents Act 1970 (amended 2005) excluding plants/animals but covering biotechnological processes; Plant Breeders' Rights under PPV&FR Act 2001 with DUS testing, farmer's rights, and compulsory licensing; Copyright for agricultural databases and software
  • Part (c): Distinction between patent (strict novelty, 20 years) and PBR (novelty, distinctness, uniformity, stability; 15-18 years); India's sui generis system balancing breeder incentives and farmer privileges

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precisely distinguishes physical vs chemical mutagens with correct molecular mechanisms; accurately describes alkylating agent action on guanine alkylation and azide's respiratory chain inhibition; correctly defines doubled haploid vs haploid; distinguishes PPV&FR Act from Patent Act provisions without conflationBasic classification correct but mechanisms vague (e.g., 'causes mutations' without specifying base substitution); conflates haploid production with DH technology; mixes up patent and PBR criteria or omits farmer's rightsConfuses mutagenesis with transgenesis; describes azide as physical mutagen; defines DH as simply 'haploid plant'; states plants are patentable in India or ignores PPV&FR Act entirely
Quantitative reasoning15%7.5Provides specific mutation frequencies (e.g., EMS 0.1-1% mutation rate), doubling times for chromosome doubling (colchicine 0.1-0.5% concentration), or efficiency rates of anther culture (5-30% green plant regeneration); cites PPV&FR Act 2001 protection duration (15 years for annuals, 18 for trees/vines)Mentions 'high efficiency' or 'faster than conventional breeding' without numbers; vague on colchicine concentration; states 'longer protection' without specifying yearsNo quantitative data; incorrect claims like '100% homozygosity in one generation' without noting chromosome doubling requirement; invents statistics
Indian context examples20%10Cites BARC gamma gardens (Trombay) for induced mutagenesis; mentions specific Indian crop varieties from mutation breeding (e.g., 'Trombay Groundnut' TG varieties, 'Pusa' mutants); references NBPGR's role in germplasm conservation; names Indian institutions for DH (CRRI, IARI, IIWBR); discusses PPV&FR Authority and its DUS testing guidelinesGeneric 'Indian agriculture' references without specific varieties or institutions; mentions 'research institutes' unnamed; vague on PPV&FR implementationNo Indian examples; uses only international references (e.g., only CIMMYT, no Indian wheat program); ignores India's sui generis system entirely
Diagram / process20%10Draws clear flowchart for mutagenesis classification with examples; illustrates alkylating agent mechanism showing O6-ethylguanine pairing with thymine; sketches anther culture protocol from pretreatment to haploid plantlet; depicts chromosome doubling with colchicine; includes timeline comparing conventional breeding (6-8 generations) vs DH (2 generations)One relevant diagram (e.g., only anther culture steps) with missing labels; text description of mechanisms without visual; incomplete flowchartNo diagrams where essential; irrelevant sketches; messy unlabelled drawings that confuse rather than clarify
Policy / extension angle20%10Discusses PPV&FR Act 2001's unique farmer's rights and benefit sharing provisions; links mutation breeding to Seed Act quality standards; examines how IP protection affects seed availability and farmer seed saving; critiques India's position on TRIPS compliance; suggests extension strategies for DH technology dissemination through KVKs and seed hubsMentions PPV&FR Act by name without detailing farmer's rights; notes 'IP protection is important' without analysis; generic extension suggestionsIgnores policy dimensions entirely; no mention of PPV&FR Act, Seed Act, or farmer rights; treats IP as purely legal without agricultural extension relevance

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