All 16 questions from the 2021 Civil Services Mains Agriculture paper across 2 papers — 800 marks in total. Each question comes with a detailed evaluation rubric, directive
word analysis, and model answer points.
50M150wCompulsorydescribeSustainable agriculture and natural resource management
Describe the following in about 150 words each:
(a) The major ways for sustainable management of natural resources (10 marks)
(b) Improved agro-practices for the production of quality protein maize (10 marks)
(c) Social forestry and various schemes related to social forestry (10 marks)
(d) The major weeds of rice and their management practices under both upland and lowland conditions (10 marks)
(e) Biofertilizers and the major constraints in popularization of biofertilizers (10 marks)
Answer approach & key points
The directive 'describe' demands factual, structured exposition with clarity and precision across all five sub-parts. Allocate approximately 30 words per sub-part (150 words total), spending roughly equal time on each since all carry 10 marks. Structure each sub-part as: definition/scope → key components/mechanisms → examples/schemes → brief significance. No conclusion needed; prioritize coverage over depth for any single part.
(a) Sustainable NRM: 3-4 major ways—conservation agriculture (zero tillage, crop rotation), integrated nutrient management (INM), integrated pest management (IPM), watershed management, and agroforestry; mention resource-use efficiency and intergenerational equity
(b) Quality Protein Maize (QPM): improved agro-practices—selection of opaque-2 or modified opaque-2 varieties, isolation distance (200-400m) to maintain protein quality, proper sowing time, balanced fertilization (especially sulphur and zinc), irrigation scheduling, and post-harvest handling to prevent amino acid degradation
(c) Social forestry: definition (forestry for community benefit); schemes—National Social Forestry Programme (1985), Joint Forest Management (1990), Farm Forestry, Community Forestry, and Agroforestry; mention NAPCC and Green India Mission linkages
(d) Rice weeds: upland weeds (Echinochloa crus-galli, Cyperus rotundus, Eleusine indica) vs lowland weeds (Echinochloa colona, Monochoria vaginalis, Marsilea quadrifoliata); management—cultural (nursery raising, transplanting), mechanical (hand weeding), chemical (butachlor, pendimethalin, bispyribac-sodium), and IPM approaches specific to water regime
(e) Biofertilizers: types (Rhizobium, Azotobacter, Azospirillum, PSB, KMB, Azolla, BGA); constraints—short shelf life, contamination, lack of quality standards, farmer skepticism, inadequate cold chain, poor extension, and incompatibility with chemical fertilizers
50MdiscussGreenhouse effect and crop diversification
(a) What is greenhouse effect? Write in detail about various greenhouse gases and their impact on crop production. (20 marks)
(b) What is the role of new agricultural technologies and market policies in crop diversification? Discuss in detail. (20 marks)
(c) Discuss the activity and selectivity of herbicides. (10 marks)
Answer approach & key points
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, 40% to part (b) for its equal weightage, and 20% to part (c). Structure as: brief introduction defining greenhouse effect → detailed body covering GHG impacts on crops, technology-policy nexus in diversification, and herbicide mechanisms → conclusion synthesizing sustainable intensification challenges.
Part (a): Scientific definition of greenhouse effect, major GHGs (CO2, CH4, N2O, O3, CFCs) with their GWP values, and specific impacts on photosynthesis, respiration, phenology, heat stress, and yield reduction in major crops
Part (a): Quantitative data on temperature rise projections for India (e.g., 1.5-2°C by 2050) and crop-specific vulnerability indices
Part (b): New agricultural technologies (precision farming, GM crops, protected cultivation, IoT, drought-resistant varieties) as drivers of diversification
Part (b): Market policies (MSP reforms, e-NAM, FPOs, export-import policies, crop insurance) and their incentive/disincentive effects on diversification decisions
Part (b): Indian examples like shift from paddy-wheat to horticulture/oilseeds in Punjab-Haryana, or millet promotion under NFSM
Part (c): Herbicide activity modes (contact vs. systemic, selective vs. non-selective) and selectivity mechanisms (morphological, physiological, biochemical)
Part (c): Specific herbicide examples relevant to Indian agriculture (2,4-D, glyphosate, atrazine, pendimethalin) with crop-weed specificity
(a) What do you understand by agroforestry? Discuss various types of agroforestry systems in India with the help of examples. (20 marks)
(b) What do you mean by Site-Specific Nutrient Management (SSNM)? Write the steps and recommendations for implementing SSNM in major cereals. (20 marks)
(c) Discuss various international conventions and recent global initiatives pertaining to climate change. (10 marks)
Answer approach & key points
The directive 'discuss' demands a comprehensive, analytical treatment across all three parts. Allocate approximately 40% of time/words to part (a) given its conceptual breadth and 20 marks, 35% to part (b) for its technical procedural content, and 25% to part (c) for its factual convention coverage. Structure with a brief integrative introduction, then address each sub-part sequentially with clear sub-headings, and conclude by linking agroforestry and SSNM as climate-resilient agricultural strategies.
Part (a): Define agroforestry as per ICRAF (land-use system integrating trees with crops/animals); classify into agrisilviculture (e.g., poplar-based system in Punjab), silvopastoral (e.g., Prosopis cineraria in Rajasthan), agrosilvopastoral (e.g., home gardens in Kerala/Northeast), and agroforestry with tree boundaries (e.g., Eucalyptus/Acacia nilotica windbreaks)
Part (a): Cite specific Indian examples—Khejri (Prosopis cineraria) in arid zones, Shifting cultivation (jhum) in Northeast, Taungya system in Odisha/MP, and recent success stories like Haritha Haram in Telangana
Part (b): Define SSNM as need-based nutrient application using 4R principle (Right source, rate, time, place); distinguish from blanket fertilizer recommendations
Part (b): Outline implementation steps—yield gap analysis, soil testing/leaf color chart (LCC) for N, Nutrient Expert tool/GIS-based mapping, customized fertilizer formulation; cite rice-wheat system in Indo-Gangetic Plains and maize in Bihar
Part (c): Enumerate UNFCCC (1992), Kyoto Protocol (1997), Paris Agreement (2015) with India's NDCs; mention recent initiatives like Glasgow Climate Pact (COP26), Koronivia Joint Work on Agriculture, and India's National Action Plan on Climate Change (NAPCC) with National Mission for Sustainable Agriculture (NMSA)
50MdiscussSoil fertility and integrated farming systems
(a) What are the factors responsible for declining soil fertility? Discuss various measures adopted for improving soil productivity. (20 marks)
(b) Define Integrated Farming System (IFS). How can IFS improve the income of different landholding groups? (20 marks)
(c) Describe the major biological control methods of weeds. (10 marks)
Answer approach & key points
The directive 'discuss' demands a comprehensive, analytical treatment with balanced coverage across all three sub-parts. Allocate approximately 40% effort to part (a) on soil fertility decline and improvement measures, 40% to part (b) on IFS definition and income enhancement across landholding categories, and 20% to part (c) on biological weed control methods. Structure with a brief introduction, detailed body addressing each sub-part sequentially with clear sub-headings, and a concluding synthesis on sustainable agriculture.
Part (a): Natural factors (weathering, leaching, erosion) and anthropogenic factors (excessive tillage, monocropping, imbalanced fertilization, residue burning) causing fertility decline; improvement measures including organic amendments, green manuring, biofertilizers, precision nutrient management, and soil health card scheme
Part (a): Specific mention of secondary and micronutrient deficiencies emerging in intensive Indian agriculture (Zn, B, S) and corrective strategies
Part (b): Precise definition of IFS as holistic, synergistic combination of crop, livestock, fishery, and allied enterprises with nutrient and resource recycling
Part (b): Landholding-specific IFS models: marginal farmers (kitchen garden + goatry + poultry), small farmers (rice-fish-duck/azolla), medium/large farmers (dairy-biogas-vermicompost-crop integration) with income diversification and risk reduction mechanisms
Part (c): Classical biological control (importation of natural enemies like Puccinia chondrillina for skeleton weed), inundative control (bioherbicides like Phytophthora palmivora for milkweed), and competitive suppression (allelopathic cover crops, smother crops like sunn hemp)
Part (c): Successful Indian examples: Parthenium management through Zygogramma bicolorata, Lantana biocontrol, and integration with mycoherbicide research at NBAIR
50M150wCompulsorydescribeAgricultural policies and technologies
Describe Q. Nos. 5(a), 5(c), 5(d), 5(e) and answer Q. No. 5(b) (in about 150 words each):
(a) Technologies and policies for sustained crop production in rainfed agriculture (10 marks)
(b) Define Information and Communication Technologies (ICTs). Discuss various initiatives to promote ICTs in agriculture. (10 marks)
(c) The Minimum Support Price (MSP) and its determination (10 marks)
(d) Pradhan Mantri Fasal Bima Yojana (PMFBY) and its progress (10 marks)
(e) Parameters for determination of quality of irrigation water (10 marks)
Answer approach & key points
This multi-part question requires descriptive responses across five distinct agricultural themes, with part (b) additionally demanding discussion. Allocate approximately 150 words per sub-part (equal distribution since all carry 10 marks). For (a), focus on watershed management and dryland technologies; for (b), begin with a precise ICT definition before discussing initiatives; for (c), explain the CACP formula and Swaminathan Commission recommendations; for (d), cover structural features and implementation data; for (e), detail chemical and physical parameters with threshold values. Maintain thematic coherence without separate introductions for each part.
(a) Rainfed technologies: in-situ moisture conservation (bunding, terracing), drought-resistant varieties (ICRISAT hybrids), watershed development under WDC-PMKSY; policies: MGNREGA for water harvesting, National Rainfed Area Authority
(b) ICT definition: digital tools for information exchange; initiatives: Kisan Call Centres (toll-free 1551), mKisan SMS portal, eNAM, Soil Health Card portal, AgriStack, drone-based Kisan drones
(c) MSP determination: CACP recommendation based on A2+FL cost, C2 cost (Swaminathan formula), market price trends, demand-supply, international prices; crops covered under 22 mandated crops
(d) PMFBY features: uniform premium (2% kharif, 1.5% rabi, 5% horticulture), use of remote sensing, smartphone-based CCEs; progress: coverage expansion, reduction in claim settlement time, challenges in penetration in eastern states
(e) Irrigation water quality: SAR/ESP for sodicity hazard, RSC for residual carbonate, EC for salinity, boron/trace element toxicity; classification into C1-C4 and S1-S4 categories
(a) Define soil erosion and its different forms. Explain agronomic and mechanical measures to reduce the adverse effects of soil erosion in crop production. (20 marks)
(b) What is irrigation potential of India and how can it be increased through rain-water harvesting? (20 marks)
(c) Discuss cooperative marketing with successful case studies. (10 marks)
Answer approach & key points
The directive 'explain' demands conceptual clarity with cause-effect linkages across all three parts. Allocate approximately 40% of word budget to part (a) given its 20 marks and technical depth, 35% to part (b) for data integration, and 25% to part (c) for concise case study presentation. Structure as: brief integrated introduction → three distinct sections with clear sub-headings → synthesizing conclusion on sustainable agriculture.
Part (a): Precise definition of soil erosion (geological vs. accelerated) with classification into water (sheet, rill, gully, splash), wind, and tillage erosion; agronomic measures (contour farming, strip cropping, mulching, cover crops, crop rotation) and mechanical measures (terracing, bunding, gully plugging, check dams) with their specific applicability conditions
Part (b): Current irrigation potential statistics (net vs. gross, surface vs. groundwater); gap between created and utilized potential; rainwater harvesting techniques (farm ponds, percolation tanks, recharge structures, rooftop harvesting) and their role in bridging the gap
Part (c): Cooperative marketing concept distinguishing it from cooperative farming; structural components (processing, storage, credit linkage); successful case studies such as AMUL (Gujarat), Karnataka Milk Federation, or Maharashtra's Warana cooperative
Integration point: Link between soil conservation and water harvesting for sustainable intensification
Critical analysis: Limitations of mechanical measures in smallholder contexts and cooperative marketing challenges in fragmented landholdings
(a) Define ecology. Mention its basic concepts and relevance in crop production. (20 marks)
(b) How to improve drainage of waterlogged areas? Discuss the advantages and limitations of drip and sprinkler irrigation methods. (20 marks)
(c) Discuss various approaches of extension. Describe the recent emerging concepts in transfer of technology. (10 marks)
Answer approach & key points
The question demands a multi-part descriptive response with 'define' as the primary directive for part (a), 'discuss' for parts (b) and (c). Allocate approximately 40% of time/words to part (a) given its 20 marks, 40% to part (b) for its equal weightage, and 20% to part (c). Structure as: concise definitions and concepts for (a), drainage techniques followed by comparative irrigation analysis for (b), and extension approaches culminating in emerging ToT concepts for (c). Conclude with integrated insights on sustainable agriculture.
Part (a): Precise definition of ecology (E.P. Odum/Tansley); ecosystem, habitat, niche, trophic levels, energy flow, nutrient cycling; relevance in crop production through pest-predator balance, pollination services, and sustainable yield optimization
Part (b): Surface drainage (open ditches, land grading), subsurface drainage (tile drains, mole drains), bio-drainage with Eucalyptus/Acacia; drip irrigation advantages (WUE 90-95%, fertigation, saline water use) vs limitations (clogging, high initial cost); sprinkler advantages (uniform coverage, frost protection) vs limitations (wind interference, energy cost, foliar disease risk)
Part (c): Extension approaches—linear (diffusion), participatory (Farming Systems Research), pluralistic (public-private-NGO); emerging ToT concepts: precision agriculture, drone-based advisory, KVK digital platforms, AI/ML crop models, climate-smart villages under NICRA
Integration: Link ecology principles to water management decisions and extension delivery mechanisms for holistic farm productivity
Indian examples: Indo-Gangetic waterlogging (Haryana's tile drainage), Gujarat's Jyotigram for drip adoption, Andhra Pradesh's Rythu Bharosa Kendras for extension
50Mcritically examineAgricultural extension and price policy
(a) Critically examine the major extension programmes of agricultural sector in India. Suggest different measures to improve technology dissemination and adoption at farmer's field. (20 marks)
(b) Discuss the success and failure of agricultural price policy since its inception. Discuss the recent initiatives/changes in agricultural price policy. (20 marks)
(c) Discuss the value addition of forest products. (10 marks)
Answer approach & key points
The directive 'critically examine' for part (a) demands balanced analysis with judgment, while 'discuss' for parts (b) and (c) requires comprehensive coverage with multiple perspectives. Allocate approximately 40% of time/words to part (a) given its analytical depth and 20 marks, 35% to part (b) for historical evolution and recent changes, and 25% to part (c) for value addition coverage. Structure with a brief integrated introduction, three distinct sections with clear sub-headings, and a conclusion synthesizing policy linkages across extension and price support.
Part (a): Critical evaluation of T&V system, KVKs, ATMA, and privatized extension models (Kisan Call Centres, agri-clinics) with their limitations in reach and gender bias
Part (a): Measures for technology dissemination including FPO-led extension, digital platforms (KisanSarathi, WhatsApp-based advisories), and participatory approaches like farmer field schools
Part (b): Successes of price policy (food security, MSP as floor price, Green Revolution stimulus) and failures (regional bias, procurement gaps, fiscal burden, distortion of cropping patterns)
Part (b): Recent initiatives including PM-AASHA (PDPS, PSS, PSSS), e-NAM, PM-KISAN income support, and shift from price support to direct income transfer
Part (c): Value addition in NWFPs including bamboo processing, lac cultivation, medicinal plants (tribal value chains), and institutional support through Van Dhan Vikas Yojana and SFURTI clusters
50M150wCompulsorydescribeGenetics and plant breeding concepts
Answer the following questions in about 150 words each : 10×5=50
(a) What do you mean by gene pool concept and genetic erosion ? Classify the gene pool of a crop. 10
(b) Describe the advantages and disadvantages of mass selection, simple recurrent selection and clonal selection. 10
(c) Explain the importance of somatic hybridization in agriculture. 10
(d) 'Intellectual Property Rights (IPR)' issue is a sensitive topic in agriculture. Concisely describe this with your conclusions. 10
(e) Write short notes on the following : 10
(i) Asexual Reproduction
(ii) Progeny Test
(iii) Seed Bank
(iv) Genetically Modified Crop
Answer approach & key points
The directive 'describe' demands clear, structured exposition of concepts with appropriate classification and comparison. Allocate approximately 25 words each to parts (a)-(d) and 12-13 words each to the four sub-parts under (e), totaling ~150 words. Structure each part with: definition → classification/comparison → significance/example. For (b) and (e), use tabular or bullet format to save words while ensuring coverage of all components.
(a) Gene pool concept: Harlan & de Wet's three gene pools (primary, secondary, tertiary) with hybridization barriers; genetic erosion causes (replacement of landraces, deforestation, urbanization)
(b) Mass selection: advantages (simple, low cost, maintains genetic variation) vs disadvantages (slow progress, cannot distinguish heritable vs environmental variation); Simple recurrent selection: advantages (gradual improvement, additive gene action) vs disadvantages (long cycles, limited for low heritability traits); Clonal selection: advantages (fixes superior genotype, exploits non-additive gene action) vs disadvantages (virus accumulation, narrow genetic base)
(c) Somatic hybridization: protoplast fusion overcoming sexual incompatibility, symmetric/asymmetric hybrids, applications in Brassica, potato, citrus for disease resistance and cytoplasmic male sterility
(d) IPR in agriculture: PPV&FR Act 2001 vs Seed Act, farmer's rights vs breeder's rights, biopiracy concerns (Basmati, Neem cases), conclusion on balancing innovation access with food security
50MdescribeCell biology, heterosis and male sterility
(a) Define cell. How is a plant cell different from an animal cell ? Describe a typical cell structurally and functionally, with a suitable diagram. 15
(b) Describe the physiological and molecular basis of heterosis. 15
(c) Classify types of male sterility and self-incompatibility system in plants. Describe the limitations of cytoplasmic genetic male sterility system in hybrid seed production. 20
Answer approach & key points
The directive 'describe' demands comprehensive, structured exposition of structures, processes and mechanisms across all three sub-parts. Allocate approximately 25-30% time/words to part (a) covering cell definition, plant-animal differences and diagram; 30% to part (b) explaining heterosis mechanisms; and 40-45% to part (c) as it carries highest marks, ensuring detailed classification of male sterility types with limitations. Structure as: brief introduction → systematic treatment of (a), (b), (c) with clear sub-headings → concluding synthesis on application to hybrid seed technology.
Part (c): Classification of male sterility—genetic (GMS), cytoplasmic (CMS), cytoplasmic-genetic (CGMS); sporophytic vs gametophytic self-incompatibility systems with examples
Part (c): Detailed limitations of CGMS—genetic vulnerability (T-cytoplasm in US maize blight 1970), restorer gene management, temperature sensitivity, negative pleiotropic effects on agronomic traits
Application linkage: Commercial exploitation of heterosis through CMS (e.g., rice, sorghum, pearl millet hybrids); need for alternative male sterility systems
Indian context: ICAR-developed hybrids (e.g., IRRI-ICAR rice varieties), A1/A2/A3 cytoplasm systems in pearl millet; NPT-1 rice lines; limitations in pigeonpea hybrid program
50MdescribeClonal selection, centre of origin and pollination mechanisms
(a) What is clone ? What do you understand by clonal selection ? Describe the various steps involved in clonal selection. 15
(b) What do you understand by centre of origin ? Discuss the law of homologous series of variation. 15
(c) Describe self-pollination, cross-pollination and often cross-pollination. Discuss different mechanisms for facilitating self-pollination and cross-pollination. 20
Answer approach & key points
The directive 'describe' demands detailed, systematic exposition of processes and concepts with clarity. Allocate approximately 30% time/words to part (a) on clonal selection, 30% to part (b) on centre of origin and Vavilov's law, and 40% to part (c) on pollination mechanisms given its higher mark weightage. Structure as: brief introduction defining key terms → systematic treatment of each sub-part with steps/processes clearly delineated → concluding synthesis on implications for crop improvement.
Part (a): Definition of clone as genetically identical progeny derived from somatic cells; clonal selection as selection of superior genotypes from vegetatively propagated populations; detailed steps including selection of parental clone, clonal evaluation trials, and release of improved variety
Part (b): Centre of origin as geographic area where plant species first developed distinctive properties; Vavilov's eight centres with Indian examples (Hindustan centre for rice, sugarcane); Law of homologous series explaining parallel variation patterns across related species
Part (c): Clear distinction between autogamy (self-pollination), allogamy (cross-pollination), and facultative/often cross-pollination; mechanisms for self-pollination including cleistogamy, homogamy, and chasmogamy with adaptations; mechanisms for cross-pollination including dichogamy, self-incompatibility, male sterility, and floral adaptations
Specific Indian crop examples: clonal selection in potato, sugarcane, citrus; centre of origin applications for indigenous crop diversity conservation; pollination mechanisms in rice, wheat, maize, sorghum, cotton
Integration of genetic principles: maintenance of heterozygosity in clonal propagation, genetic diversity preservation through centre of origin understanding, and breeding system manipulation through pollination control
50MdescribeSeed treatment, DNA fingerprinting and water absorption
(a) What is the role and importance of "Seed treatment campaign" in India in the context of quality crop establishment ? 15
(b) What is DNA fingerprinting ? Discuss its applied aspects in modern agriculture. 15
(c) Describe the mechanisms involved in absorption of water in plants. Explain the factors affecting the water absorption rate in plants. 20
Answer approach & key points
The directive 'describe' demands systematic exposition of processes and mechanisms. Allocate approximately 30% time/words to part (a) on seed treatment campaigns, 30% to part (b) on DNA fingerprinting, and 40% to part (c) on water absorption mechanisms as it carries the highest marks. Structure with a brief composite introduction, three distinct body sections addressing each sub-part sequentially, and a concluding synthesis on how these three pillars—quality seed, genetic precision, and water management—converge for sustainable Indian agriculture.
Part (a): Seed treatment campaign objectives—disease control, pest management, nutrient priming; institutional framework under NFSM and SMAC; coverage targets and seed replacement rate improvements
Part (a): Quality crop establishment metrics—germination percentage, field emergence, uniform stand establishment; linkage to National Seed Policy 2002 and Seed Act 1966 amendments
Part (b): DNA fingerprinting methodology—RFLP, RAPD, SSR, SNP markers; principle of polymorphism detection and genetic profiling
Part (b): Agricultural applications—variety identification and PVP protection, hybrid purity testing, marker-assisted selection, forensic seed certification, IPR enforcement under PPV&FR Act 2001
Part (c): Water absorption mechanisms—imbibition (matric potential), osmosis (solute potential), active absorption (root pressure), passive absorption (transpiration pull); role of aquaporins
Part (c): Factors affecting absorption—soil water potential, root surface area and root:shoot ratio, soil temperature, aeration status, salinity/osmotic stress, mycorrhizal associations
Integrated insight: Convergence of quality seed, genetic traceability, and optimized water absorption for climate-resilient crop establishment
50M150wCompulsorydescribeSeed viability, pest management and post-harvest technology
Answer the following questions in about 150 words each : 10×5=50
(a) Define seed viability. Describe in brief the metabolic aspects of seed germination. 10
(b) Define 'Pests' and 'Pesticides' in relation to pest management. Give a brief account of types and need for pesticide formulations. 10
(c) Narrate the role of post harvest technology in minimising losses in fruits and vegetables. 10
(d) What is "Plant Quarantine" ? Describe the plant quarantine measures with suitable examples in Indian context. 10
(e) Discuss the importance of green-house in agriculture. 10
Answer approach & key points
The directive 'describe' demands detailed, structured exposition of concepts and processes across all five sub-parts. Allocate approximately 30 words (20% time) per sub-part given equal 10-mark weightage: (a) define seed viability then outline metabolic phases of germination; (b) define terms then classify formulations; (c) enumerate post-harvest operations with loss reduction mechanisms; (d) define quarantine then detail regulatory measures with Indian examples; (e) list greenhouse advantages with applications. Use bullet points for clarity within each 150-word limit.
(a) Seed viability definition: capacity to germinate under favorable conditions; metabolic aspects: imbibition, activation of enzymes (amylase, protease), respiration shift from anaerobic to aerobic, gibberellin-mediated α-amylase synthesis in cereals, energy (ATP) generation for radicle emergence
(b) Pests: organisms causing economic damage; Pesticides: chemical/biological agents for pest control; Formulation types: EC, WP, SC, GR, ULV; Need for formulations: improved stability, targeted delivery, reduced phytotoxicity, ease of application, cost-effectiveness
(c) Post-harvest operations: precooling, sorting-grading, washing, waxing, packaging, cold storage, controlled atmosphere storage; Loss reduction: checking respiration, ethylene management, microbial decay prevention, extending shelf life, value addition through minimal processing
(d) Plant Quarantine: regulatory exclusion of pests/diseases through legal restrictions; Measures: prohibition, inspection, certification, fumigation, heat treatment; Indian examples: ban on cocoa from Ghana (CSSV), coconut from Sri Lanka (Lethal Yellowing), mango from SE Asia (fruit fly)
(e) Greenhouse importance: year-round production, climate control, water use efficiency, pesticide reduction, higher yields, off-season premium pricing, nursery raising, hybrid seed production, protected cultivation of high-value crops (flowers, exotic vegetables)
50MdescribeEnzymes, plant stress and vernalization
(a) What are enzymes ? Describe "Key-lock theory" with respect to mode of enzyme action. 15
(b) What is plant physiological stress ? Describe morphological and physiochemical changes taking place in plants under drought condition. 15
(c) What do you understand by vernalization ? Describe its practical application in crops. 20
Answer approach & key points
The directive 'describe' demands detailed, structured exposition of processes and phenomena. Allocate approximately 25-30% time/words to part (a) on enzymes and Key-lock theory, 30-35% to part (b) on drought stress responses, and 35-40% to part (c) on vernalization given its higher marks. Structure as: brief introduction defining enzymes → detailed description of Key-lock theory with diagram → definition of plant physiological stress → morphological and physiochemical changes under drought with examples → definition of vernalization → mechanism → practical applications in Indian agriculture with crop-specific examples.
Part (a): Definition of enzymes as proteinaceous biocatalysts; explanation of Key-lock theory (Fischer's template model) with specific reference to enzyme-substrate specificity; limitations and comparison with induced fit model
Part (b): Clear definition of plant physiological stress as any external factor causing deviation from optimal metabolic functioning; morphological changes under drought (wilting, leaf rolling, reduced leaf area, increased root-shoot ratio, stomatal closure)
Part (b): Physiochemical changes under drought (accumulation of proline and other compatible solutes, ABA synthesis, osmotic adjustment, ROS scavenging, photosynthetic rate decline, membrane lipid peroxidation)
Part (c): Definition of vernalization as low temperature-induced transition from vegetative to reproductive phase; distinction between facultative and obligate vernalization requirements
Part (c): Mechanism involving VIN3, FLC and FT gene expression; practical applications in Indian agriculture (winter wheat cultivation in Punjab/Haryana, temperate vegetable seed production in Nilgiris/Kashmir, double cropping systems, breeding for earliness)
Integration: Linkage between stress physiology and vernalization as temperature-dependent phenomena; mention of climate change implications for vernalization-requiring crops in India
50MdescribeEconomic thresholds, horticulture and protected cultivation
(a) What do you mean by "Economic Injury Level" (EIL) and "Economic Threshold Level" (ETL) ? Describe their roles in classifying the pests in relevance to Integrated Pest Management (IPM). 15
(b) Describe the importance of fruit cultivation in India. Discuss the role of horticulture with respect to poverty alleviation and nutritional security. 15
(c) What is protected cultivation ? What are its problems and prospects in comparison to open cultivation ? 20
Answer approach & key points
The directive 'describe' demands detailed, structured exposition of concepts, importance and comparative analysis across all three parts. Allocate approximately 25-30% time/words to part (a) on EIL/ETL with clear definitions and IPM linkages; 30% to part (b) on fruit cultivation importance with poverty-nutrition nexus; and 40-45% to part (c) on protected cultivation as it carries highest marks, ensuring balanced treatment of problems and prospects with open cultivation comparison. Structure with brief introductions for each part, systematic body addressing all sub-components, and integrated conclusion highlighting convergence across horticulture, IPM and protected cultivation for sustainable agriculture.
Part (a): Precise definitions of EIL (lowest pest density causing economic loss) and ETL (pest density at which control action should be initiated to prevent reaching EIL); distinction between EIL and ETL with ETL always below EIL; role in IPM for pest classification (key pests, occasional pests, potential pests, non-pests) and decision-making for pesticide application timing
Part (b): Importance of fruit cultivation in India covering area, production, export earnings (e.g., mango, banana, citrus), employment generation, foreign exchange; horticulture's role in poverty alleviation through smallholder suitability, higher income per unit area, women participation, value addition; nutritional security through micronutrient-rich produce, dietary diversification, malnutrition reduction
Part (c): Definition of protected cultivation (controlled environment agriculture: greenhouses, polyhouses, shade nets, insect-proof nets); problems including high initial capital investment, technical skill requirements, energy costs, pest/disease buildup in closed environment, limited indigenous technology; prospects including year-round production, water use efficiency, pesticide reduction, export-quality produce, climate resilience; systematic comparison with open cultivation on yield stability, resource efficiency, economics and market access
50McommentFood production, hunger and dietary guidelines
(a) What is the food production and consumption pattern of India in the last fifty years ? 15
(b) What do you mean by 'hunger' and 'hidden hunger' ? Comment on various strategies in combating hunger. 15
(c) What are the different "National Dietary Guidelines" of India ? What is your opinion on balanced diet of Indians ? 20
Answer approach & key points
The directive 'comment' in part (c) requires analytical judgment backed by evidence, while parts (a) and (b) demand descriptive-explanatory treatment. Allocate approximately 30% time/words to part (a) on production-consumption trends, 30% to part (b) on hunger typologies and strategies, and 40% to part (c) on dietary guidelines and your critical opinion on balanced diets. Structure with a brief integrated introduction, three distinct sections labeled (a), (b), (c), and a conclusion synthesizing food security linkages across all parts.
Part (a): Green Revolution phases (1960s-80s), post-Green Revolution stagnation, 1990s liberalization impacts, and recent diversification trends; per capita availability shifts from cereals to diversified diets
Part (a): Consumption pattern transition—declining cereal consumption, rising protein/fat intake, persistent regional disparities (NSSO data trends)
Part (b): Distinction between hunger (caloric/protein inadequacy, FAO undernourishment) and hidden hunger (micronutrient deficiencies—vitamin A, iron, zinc, iodine)
Part (b): Multi-pronged strategies—TPDS/PDS reforms, ICDS, Mid-Day Meal, NFSA 2013, biofortification (Golden Rice, iron-rich pearl millet), food fortification, dietary diversification
Part (c): ICMR-NIN dietary guidelines (2011), food pyramid/plate composition, recommended dietary allowances (RDA) for different age/activity groups
Part (c): Critical opinion on balanced diet—gap between guidelines and actual consumption, protein deficiency in vegetarian diets, rising processed food/obesity paradox, need for region-specific guidelines