Agriculture 2025 Paper II 50 marks Explain

Q3

(a) Why do fruit plants need to be propagated vegetatively ? Explain the advantages and disadvantages of asexual and sexual propagation. (20 marks) (b) Define genetic purity. How can the maintenance of genetic purity of varieties be done outside their normal cultivation area ? (20 marks) (c) Explain the functions of plant cell wall in growth, development, maintenance and reproduction of plants. (10 marks)

हिंदी में प्रश्न पढ़ें

(a) फल के पौधों का वानस्पतिक (कायिक) रूप से प्रवर्धन करना क्यों आवश्यक है ? अलैंगिक तथा लैंगिक प्रवर्धनों के लाभों व हानियों की व्याख्या कीजिए। (20 अंक) (b) आनुवंशिक शुद्धता को परिभाषित कीजिए। प्रजातियों की आनुवंशिक शुद्धता को उनके सामान्य कृषि क्षेत्र के बाहर कैसे बनाए रखा जा सकता है ? (20 अंक) (c) पौधों की वृद्धि, विकास, रखरखाव तथा प्रजनन में पादप कोशिका भित्ति के कार्यों की व्याख्या 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.

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How this answer will be evaluated

Approach

The directive 'explain' demands clear reasoning with cause-effect linkages across all three sub-parts. Allocate approximately 40% of time/words to part (a) given its 20 marks, 35% to part (b) for its 20 marks, and 25% to part (c) for its 10 marks. Structure with a brief introduction on propagation importance, then address each sub-part sequentially with balanced depth, concluding with integrated insights on quality planting material and sustainable agriculture.

Key points expected

  • Part (a): Reasons for vegetative propagation in fruit plants (heterozygosity, juvenility maintenance, true-to-type progeny); advantages and disadvantages of asexual (uniformity, virus transmission, no genetic variation) versus sexual (hybrid vigour, genetic diversity, juvenile phase) propagation
  • Part (b): Definition of genetic purity (trueness to type, absence of off-types, genetic contaminants); maintenance methods outside normal cultivation area including seed villages, isolated seed production centres, off-season nursery raising, tissue culture for virus-free stock, and use of protected structures
  • Part (c): Cell wall functions in growth (cell expansion, turgor pressure maintenance), development (morphogenesis, cell differentiation), maintenance (structural support, protection against pathogens), and reproduction (pollen tube growth, fertilization, embryo development)
  • Indian examples: ICAR's National Horticulture Mission for vegetative propagation; seed production in Kashmir/HP for off-season potato; NBPGR's germplasm conservation; tissue culture facilities at NRC for Banana, Citrus
  • Technical specifics: Apomixis vs amphimixis; somaclonal variation; lignin, cellulose, pectin roles; plasmodesmata in cell-to-cell communication
  • Policy linkages: Seeds Act 1966, PPVFR Act 2001, ICAR seed certification standards; relevance for doubling farmers' income and export quality standards

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Demonstrates precise understanding of heterozygosity in fruit crops, genetic purity parameters (physical, genetic, analytical), and cell wall biochemistry (cellulose microfibrils, hemicellulose, pectin matrix); correctly distinguishes between zygotic and nucellar embryony in part (a), defines genetic purity with ISO/ISTA standards in part (b), and explains turgor-driven cell expansion with acid growth hypothesis in part (c)Covers basic concepts but with minor errors (e.g., conflates genetic purity with physical purity, oversimplifies cell wall as merely 'protective layer', or lists propagation methods without explaining why heterozygosity necessitates vegetative propagation)Fundamental misconceptions (e.g., states vegetative propagation creates genetic variation, defines genetic purity only as 'good quality seeds', or describes cell wall as non-living structure without functional roles in growth/reproduction)
Quantitative reasoning10%5Includes relevant quantitative data: juvenile period years for mango (8-10 years) vs vegetative propagation (3-4 years to fruiting); genetic purity standards (99% for certified seed, 99.9% for breeder seed); cell wall composition percentages (cellulose 40-50%, hemicellulose 20-30%); or isolation distances for seed production (400m for self-pollinated, 800m for cross-pollinated crops)Mentions some numerical data but without precision or relevance (e.g., 'long juvenile period' without years, 'high purity' without percentages, or generic cell wall composition without plant-specific context)No quantitative dimension; entirely qualitative description without any numerical substantiation where data would strengthen argument
Indian context examples20%10Cites specific Indian programmes: NHB's hi-tech nursery scheme; seed production in Kufri (HP) and Ooty (TN) for off-season potato; NRC for Grapes, Pune for virus-free planting material; PPVFR Authority's guidelines for genetic purity maintenance; ICAR-CPRI's seed village concept; or state-specific examples like Karnataka's mango grafting programmeGeneric references to 'government schemes' or 'ICAR' without specificity; mentions India as agricultural country without concrete institutional or regional examples relevant to propagation and genetic purityNo Indian context; uses only foreign examples (e.g., USA citrus programmes) or completely misses relevance of genetic purity maintenance for Indian agro-climatic diversity and export requirements
Diagram / process25%12.5Includes well-labelled diagrams: for (a) comparison of seedling vs grafted plant juvenile phases, or T-budding/cleft grafting steps; for (b) isolation distance schematic for seed production, or tissue culture stages (callus-shoot-root); for (c) cell wall ultrastructure showing middle lamella, primary/secondary walls, plasmodesmata, or pollen tube penetration through style with enzyme action on cell wallDescribes processes verbally without diagrams, or includes poorly labelled sketches that miss key structural details (e.g., cell wall diagram without distinguishing primary/secondary wall, or propagation methods listed without sequential process)No diagrams or process descriptions; entirely text-based without visual representation of grafting techniques, tissue culture stages, or cell wall architecture critical for 12.5 marks in this dimension
Policy / extension angle20%10Integrates policy dimensions: Seeds Act 1966 and 2002 amendments for genetic purity enforcement; PPVFR Act 2001 for farmers' and breeders' rights; National Seed Policy 2002; ICAR's seed certification categories (nucleus, breeder, foundation, certified); relevance for WTO-SPS compliance for export; extension through KVKs for quality planting material distribution; and link to PM-KISAN, MIDH for horticulture developmentMentions one or two policies superficially (e.g., only 'Seed Act' without year or provisions) or describes extension methods generically without connecting to regulatory frameworks for genetic purity and quality controlNo policy or extension perspective; treats question as purely technical without addressing how government ensures genetic purity, certifies seeds, or extends vegetative propagation technology to small farmers

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