Overview
Previous Year UPSC-CSE Questions By the end you will be able to draft model answers for the following UPSC questions. Each question carries a collapsible framework showing how to approach it in the exam.
- UPSC Prelims 2020Consider the following statements:
- 36% of India’s districts are classified as “overexploited” or “critical” by the Central Ground Water Authority (CGWA).
- CGWA was formed under the Environment (Protection) Act.
- India has the largest area under groundwater irrigation in the world.
Which of the statements given above is/are correct?
How to approach this Prelims question
Approach: Statement 1 cites a specific percentage that the UPSC key rejects (the precise figure varies with assessment cycle and the 36 per cent threshold is not the binding official statistic). Statements 2 and 3 are institutional facts. CGWA's statutory basis is the Environment Protection Act 1986 Section 3(3). India's groundwater-irrigated area exceeds China's and the United States.
Trap to watch: Statement 1 sounds plausible because overexploited and critical assessment-unit counts are widely cited; but the precise 36 per cent district-level figure is not the standard reference. Trust the institutional facts (statements 2 and 3) over the contested statistic.
Key facts to recall:
- Central Ground Water Authority constituted 1997 under Environment Protection Act 1986 Section 3(3).
- India has the largest area under groundwater irrigation globally; Punjab and Haryana are among the most groundwater-dependent agricultural states.
- Wheat-rice rotation in the Indo-Gangetic Plain is the GR-attributable driver of groundwater overdraft.
- Assessment units (blocks and talukas) are classified as safe, semi-critical, critical, or overexploited based on extraction-to-recharge ratio; this is the standard CGWA framework rather than district-level percentages.
Answer signal: Correct answer is (b) (2 and 3 only); CGWA statute and India's largest-area-under-groundwater-irrigation claim verify; the 36 per cent district figure does not match the official key.
- UPSC Prelims 2020With reference to chemical fertilizers in India, consider the following statements:
- At present, the retail price of chemical fertilizers is market-driven and not administered by the Government.
- Ammonia, which is an input of urea, is produced from natural gas.
- Sulphur, which is a raw material for phosphoric acid fertilizer, is a by-product of oil refineries.
Which of the statements given above is/are correct?
How to approach this Prelims question
Approach: Statement 1 is wrong because retail fertiliser pricing in India is heavily administered through the Government subsidy architecture. Urea has a statutorily controlled maximum retail price; phosphatic and potassic fertilisers operate under the Nutrient-Based Subsidy regime that fixes per-tonne subsidy and lets industry set MRP within that constraint. Statements 2 and 3 are correct feedstock facts. Ammonia is produced from natural gas via the Haber-Bosch route. Sulphur is recovered as a by-product of petroleum refining (hydrodesulphurisation).
Trap to watch: Statement 1 is the trap because in a liberalised-economy framing it sounds correct; but Indian fertiliser pricing remains the most administered sub-sector of agricultural inputs.
Key facts to recall:
- Urea MRP is statutorily controlled; phosphatic and potassic fertilisers operate under Nutrient-Based Subsidy.
- Ammonia from natural gas via Haber-Bosch; the gas-feedstock cost determines urea production economics.
- Sulphur is an oil-refining by-product via hydrodesulphurisation; used as raw material for sulphuric acid and phosphoric acid.
- NPK ratio distortion (nitrogen-skewed actual versus the 4:2:1 ideal) traces to the urea-subsidy bias.
Answer signal: Correct answer is (b) (2 and 3 only); fertiliser pricing is administered not market-driven; ammonia and sulphur feedstock facts verify.
- UPSC Prelims 2018With reference to the circumstances in Indian agriculture, the concept of 'Conservation Agriculture' assumes significance. Which of the following fall under the Conservation Agriculture?
- Avoiding the monoculture practices
- Adopting minimum tillage
- Avoiding the cultivation of plantation crops
- Using crop residues to cover soil surface
- Adopting spatial and temporal crop sequencing/crop rotations
Select the correct answer using the code given below:
How to approach this Prelims question
Approach: Apply the canonical three-principle definition: minimum or no tillage, permanent crop residue cover, crop rotation or association. Map statements 2, 4, 5 to these three principles. Statement 1 (avoid monoculture) is a consequence of statement 5 (rotation) rather than a separate defining principle in the official UPSC framing. Statement 3 (avoid plantation crops) is irrelevant to the CA definition.
Trap to watch: Treating monoculture-avoidance (statement 1) as a separate principle; in the official UPSC framing it is folded into rotation. The trap of including statement 3 only catches careless readers; plantation crops can themselves be managed under conservation principles.
Key facts to recall:
- Three canonical CA principles: minimum or no tillage, permanent residue cover, crop rotation or association.
- CA inverts the GR 1.0 pattern of monoculture plus intensive tillage plus residue burning.
- Happy Seeder enables direct sowing into standing wheat residue without burning; key CA-implementation tool.
- Full elaboration of CA and related sustainable agriculture practices is in GR P7.
Answer signal: Correct answer is (c) (2, 4 and 5); the three canonical CA principles minimum tillage, residue cover, crop rotation.
The socio-economic and environmental critique of the Green Revolution catalogues the costs that emerged alongside the productivity gain. The critique has two axes. The socio-economic axis documents rural inequality (the wheat-belt success reinforced regional and class disparities; covered in GR P4 regional analysis), mechanisation-driven labour displacement (tractors and harvesters reduced labour demand at peak operations), marginal-farmer exclusion from the HYV-fertiliser-credit package (only farmers with assured irrigation and credit access could adopt), tenancy displacement (landlords resumed personal cultivation once HYV made farming profitable), and agrarian-capitalism deepening (farming shifted from subsistence to market orientation). The environmental axis documents groundwater depletion in Punjab and Haryana (the wheat-rice rotation is water-intensive and tube-well extraction outstripped recharge), soil degradation (continuous monoculture without fallow degraded soil structure and depleted micronutrients), chemical-fertiliser overuse (NPK use heavily skewed toward nitrogen against the ideal 4:2:1 distorts soil chemistry; covered in Agri P9), pesticide residue accumulation (Punjab cancer corridor anecdotes), agro-biodiversity loss (traditional varieties of rice and wheat displaced by a handful of HYVs), and stubble-burning origin (mechanised wheat harvesting leaves standing residue burnt to prepare fields for rice). The bridge to Green Revolution 2.0 uses these costs as the rationale for the productivity-to-sustainability pivot covered in P6 through P10.
Background and Historical Context
The Green Revolution made India food-secure but did not make Indian agriculture sustainable. The wheat-belt success masked rural inequality at the all-India scale, the productivity gain came with measurable environmental costs that compound over decades, and the institutional architecture optimised for the wheat-rice package proved poorly fitted to the rainfed-region and small-holder problem the present day requires solving. UPSC Prelims has tested the groundwater-depletion dimension (UPSC Prelims 2020 on Central Ground Water Authority and 36 per cent overexploited or critical districts), the fertiliser-subsidy architecture as the GR 1.0 environmental cost driver (UPSC Prelims 2020 on chemical fertilisers retail pricing and ammonia and sulphur feedstock), and the Conservation Agriculture concept as the bridge to GR 2.0 (UPSC Prelims 2018 on minimum tillage, residue cover, crop rotation as the three CA pillars).
What is the significance of the critique-plus-bridge framing? Three operational dimensions follow. The cost-accounting dimension means the GR 1.0 productivity gain has to be netted against socio-economic and environmental costs that became visible only after two or three decades of compounding; honest accounting concedes that absolute food-grain production rose while per-hectare ecological capital depleted. The policy-correction dimension means the costs themselves drove the next-generation policy architecture (NICRA on climate resilience, Soil Health Card on nutrient balance, PMKSY on irrigation efficiency, PKVY on organic farming, PM-KUSUM on solar pumps to break the diesel-or-electricity tube-well subsidy trap); the costs are the policy briefs that the contemporary architecture is responding to. The conceptual-pivot dimension means the Evergreen Revolution by M S Swaminathan and the Second Green Revolution proposals are reframings that retain the productivity ambition while adding sustainability, equity, and climate-resilience constraints; the conceptual shift from productivity-only to productivity-with-sustainability is the load-bearing pivot the next five parts elaborate.
Current threads include the Evergreen Revolution concept by M S Swaminathan defined as productivity improvement in perpetuity without ecological harm (the framing is the conceptual anchor for GR 2.0), the Second Green Revolution proposals routinely invoked in policy discourse for eastern India and rainfed regions (cross-link to GR P4 BGREI), the sustainability transition from input-intensive to resource-efficient agriculture that the National Mission for Sustainable Agriculture operationalises (covered in P10), and the climate-resilience imperative that the NICRA programme by ICAR drives (covered in P8). The cluster-architecture lesson is that the GR 1.0 arc is now closed at P5; the GR 2.0 arc opens at P6 with the concept-and-rationale entry and runs through P10 with the policy-and-FPO cluster-closer.
Critique Architecture and the Bridge to GR 2.0
Two axes of GR 1.0 critique, one bridge to GR 2.0
The Green Revolution made India food-grain self-sufficient by the early 1980s. The same wheat-rice intensification produced costs that became visible across two and three decades. The costs sort cleanly into two axes. The socio-economic axis catalogues distributional consequences (regional inequality, class inequality, labour displacement, tenancy reorganisation).
The environmental axis catalogues ecological consequences (groundwater depletion, soil degradation, chemical pollution, agro-biodiversity loss, stubble-burning origin). The bridge to Green Revolution 2.0 reframes these costs as the explicit rationale for the productivity-to-sustainability pivot elaborated in P6 through P10.
Socio-Economic Critique
Rural inequality, mechanisation-displacement, tenancy reorganisation
The Green Revolution productivity gain concentrated in farmers who already commanded the preconditions for adoption (assured irrigation, post-1956 consolidated holding, credit access, FCI mandi proximity). The distributional outcome was a widening gap between the wheat-belt large farmer and the rainfed small farmer. Within the wheat belt, the gap widened between cultivators who could finance the tube-well-and-tractor package and tenants who could not. The mechanisation dimension reduced labour demand at peak operations; combine harvesters in particular displaced the harvest-time agricultural labourer.
- Inter-regional inequality: Punjab and Haryana wheat-belt productivity rose substantially; eastern India and dryland Peninsular productivity stagnated for two decades (covered in GR P4 regional divergence).
- Intra-regional inequality: Within Punjab and Haryana, large farmers with assured irrigation captured the bulk of the gain; small farmers and tenants without credit access participated marginally.
- Mechanisation-displacement: Tractors, combine harvesters, threshers, pump-sets reduced labour demand at peak operations; landless agricultural labour migration from Bihar and eastern UP to Punjab compensated partially but did not absorb the displacement at origin.
- Tenancy reorganisation: Once HYV-fertiliser-water made farming profitable, many landlords resumed personal cultivation; tenants were evicted or shifted to wage labour; the legal land-ceiling and tenancy-protection laws were implemented unevenly.
- Agrarian capitalism deepening: Farming shifted from subsistence orientation to market orientation; input-output accounting and credit-financed investment became standard; the family-farm model under stress.
The Bharat Kisan Union and farmer-union activity that emerged in the Indo-Gangetic wheat belt during the 1980s reflected the contradictions of GR 1.0 successful but stratified: the same prosperity that financed the union activity also produced the agrarian distress (input-price-output-price scissor) that the unions mobilised against. The contemporary farmer-protest cycles (Punjab and Haryana wheat-belt mobilisation around minimum-support-price and procurement architecture) trace to this GR-attributable agrarian-capitalist structure.
Environmental Critique
Groundwater depletion, soil degradation, chemical pollution
The wheat-rice rotation in Punjab and Haryana is the most water-intensive cropping pattern in the Indian agro-climatic palette. Rice requires standing water through the kharif season; wheat requires assured rabi irrigation. Tube-well extraction sustained the rotation across decades while natural recharge could not keep pace. The Central Ground Water Authority data on overexploited and critical assessment-unit districts is the binding indicator of the depletion trajectory.
Soil degradation followed a parallel path. Continuous monoculture without fallow, distorted NPK application (skewed heavily toward urea), and minimal organic-matter return depleted soil structure and micronutrient balance. The two consequences compound: the same intensification that drew down the water table also exhausted the soil that the rotation depended on.
- Groundwater depletion in Punjab and Haryana: Tube-well extraction outstripped recharge through the GR phase; the Central Ground Water Authority overexploited and critical district share is the contemporary indicator (UPSC Prelims 2020 tested this architecture).
- Soil structural degradation: Continuous wheat-rice monoculture compacted soil; absence of fallow and pulse rotation depleted organic matter and microbial biomass (cross-link to Soils P10).
- Nutrient imbalance: NPK use in Indian agriculture is heavily skewed toward nitrogen against the ideal 4:2:1; urea-subsidy distortion drives the imbalance toward nitrogen (covered in Agri P9 contemporary input package).
- Chemical fertiliser subsidy architecture: Retail fertiliser pricing in India is administered, not market-driven; subsidy on urea and other fertilisers shapes farmer-level application; ammonia is produced from natural gas, sulphur is a by-product of oil refining (UPSC Prelims 2020 tested this architecture).
- Pesticide residue accumulation: Punjab cancer-corridor anecdotes (Bathinda-Faridkot belt) traced epidemiologically to pesticide application during the GR phase; precise causality contested but exposure trajectory documented.
- Agro-biodiversity loss: Indigenous landraces of rice and wheat displaced by a handful of dwarf HYVs; the food-grain gene pool narrowed; seed-bank conservation at ICAR-NBPGR is the response.
- Stubble-burning origin: Combine harvesting leaves standing residue; short window between paddy harvest and wheat sowing in Punjab and Haryana made burning the default field-preparation choice; the contemporary north-India winter air-quality crisis traces directly to this GR-era practice.
Bridge to Green Revolution 2.0
Evergreen Revolution and Second Green Revolution
The conceptual response to the GR 1.0 critique began within the GR generation itself. M S Swaminathan, the Indian-side architect of the wheat-belt HYV programme (covered in GR P2), defined the Evergreen Revolution as productivity improvement in perpetuity without ecological harm. The framing retains the productivity ambition that GR 1.0 vindicated while adding the sustainability constraint that GR 1.0 violated.
The Second Green Revolution proposals invoke a parallel intensification effort in eastern India and rainfed regions previously excluded. The BGREI scheme (Bringing Green Revolution to Eastern India) is the policy instance, covered in GR P4. Both framings share one move: they keep the yield ambition and attach an equity-and-ecology constraint that GR 1.0 lacked.
These concepts are the conceptual anchors for the GR 2.0 entries that follow. The remaining five parts of this cluster move the argument from critique to design, each picking up one strand of the sustainability constraint that the Evergreen Revolution framing introduced.
- GR P6: GR 2.0 concept and rationale, with the four drivers (groundwater crisis, soil degradation, declining factor productivity, monoculture crisis) and the GR 1.0 versus GR 2.0 comparison.
- GR P7: sustainable agriculture (Conservation Agriculture, Organic Farming, Natural Farming, ZBNF), with Andhra Pradesh Community-Managed Natural Farming and the Sikkim Organic State as embedded cases.
- GR P8: climate-smart and climate-resilient agriculture (Swarna-Sub1 flood-tolerant rice, the NICRA programme by ICAR).
- GR P9: precision agriculture, digital agriculture, and biofortified crops.
- GR P10: the policy architecture of GR 2.0 (NMSA, PM-KUSUM, NFSM, PMFBY, and the FPO institutional vehicle), closing the cluster.
| Dimension | Green Revolution 1.0 | Green Revolution 2.0 |
|---|---|---|
| Primary goal | Output per hectare; food-grain self-sufficiency | Output with ecological and equity constraints |
| Input model | Input-intensive (HYV seed, fertiliser, assured water) | Resource-efficient (climate-smart, natural farming) |
| Cropping pattern | Wheat-rice monoculture | Diversification (millets, pulses, oilseeds) |
| Spatial focus | Irrigated Indo-Gangetic belt (Punjab, Haryana, west-UP) | Eastern India and rainfed regions (BGREI focus) |
| Field practice | Intensive tillage and residue burning | Conservation Agriculture (minimum tillage, residue cover, rotation) |
Conservation Agriculture as the bridge concept
The single most testable bridge concept between GR 1.0 critique and GR 2.0 architecture is Conservation Agriculture. The concept rests on three principles: minimum or no tillage to preserve soil structure, permanent crop residue cover to protect topsoil and recycle nutrients, and crop rotation or association to break pest cycles and diversify the soil microbiome.
These three principles invert the GR 1.0 pattern of monoculture, intensive tillage, and residue burning. UPSC Prelims has tested the precise three-principle definition (the Prelims 2018 question on the Conservation Agriculture concept). The full elaboration is in GR P7.
Prelims MCQ practice
Each question below tests one specific concept on the topic. Click to reveal the answer and a full option-wise explanation.
Q1. Consider the following statements about the environmental cost of the Green Revolution in the Indo-Gangetic wheat belt:
- Groundwater depletion in Punjab and Haryana intensified through the Green Revolution phase as tube-well extraction outstripped natural recharge.
- The wheat-rice rotation is among the most water-intensive cropping patterns in the Indian agro-climatic palette.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer and explanation
Answer: Both 1 and 2
Explanation.
Correct: c (Both 1 and 2). Statement 1 is correct: dense tube-well drilling in Punjab and Haryana through the GR phase extracted groundwater faster than the aquifer recharged; the water table has fallen substantially. Statement 2 is correct: wheat-rice is the most water-intensive standard rotation in Indian agriculture, requiring assured irrigation in both rabi (wheat) and kharif (rice) seasons.
Q2. Consider the following statements about the Central Ground Water Authority (CGWA):
- CGWA was constituted in 1997 under the Environment (Protection) Act 1986 with the mandate to regulate ground water development.
- India has the largest area under groundwater irrigation in the world.
- CGWA functions under the Ministry of Jal Shakti, Department of Water Resources.
Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Show answer and explanation
Answer: 1, 2 and 3
Explanation.
Correct: d (1, 2 and 3). Statement 1 is correct: CGWA was constituted 1997 under Section 3(3) of the Environment (Protection) Act 1986. Statement 2 is correct: India has the largest area under groundwater irrigation worldwide; Punjab and Haryana are among the most groundwater-dependent agricultural states. Statement 3 is correct: CGWA is a statutory regulator that now functions under the Ministry of Jal Shakti, Department of Water Resources.
Q3. With reference to chemical-fertiliser pricing in India, consider the following statements:
- Urea has a statutorily controlled maximum retail price in India.
- Phosphatic and potassic fertilisers operate under the Nutrient-Based Subsidy regime which fixes a per-tonne subsidy and lets industry set MRP within that constraint.
- The retail price of all chemical fertilisers in India is fully market-driven without any subsidy or price control.
Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Show answer and explanation
Answer: 1 and 2 only
Explanation.
Correct: a (1 and 2 only). Statement 1 is correct: urea MRP is statutorily controlled; this is the source of the urea-bias in NPK application that distorts soil chemistry. Statement 2 is correct: phosphatic and potassic fertilisers operate under the Nutrient-Based Subsidy (NBS) regime. Statement 3 is wrong: Indian fertiliser pricing is heavily administered through the subsidy architecture; NOT fully market-driven.
Q4. Consider the following statements about the canonical three-principle definition of Conservation Agriculture:
- Minimum or no tillage to preserve soil structure is a Conservation Agriculture principle.
- Permanent crop residue cover on the soil surface is a Conservation Agriculture principle.
- Continuous monoculture of a single high-input crop is the third Conservation Agriculture principle.
Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Show answer and explanation
Answer: 1 and 2 only
Explanation.
Correct: a (1 and 2 only). Statement 1 is correct: minimum or no tillage is one of the three CA principles. Statement 2 is correct: permanent residue cover is the second CA principle. Statement 3 is WRONG: the third CA principle is crop rotation or association (NOT monoculture); monoculture is the GR 1.0 pattern that CA explicitly inverts.
Q5. Consider the following statements about the Evergreen Revolution concept:
- The Evergreen Revolution concept was articulated by M S Swaminathan as productivity improvement in perpetuity without ecological harm.
- The Evergreen Revolution is the conceptual anchor of the Green Revolution 2.0 architecture covered in Parts 6 to 10 of this cluster.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer and explanation
Answer: Both 1 and 2
Explanation.
Correct: c (Both 1 and 2). Statement 1 is correct: Swaminathan articulated the Evergreen Revolution as productivity improvement in perpetuity without ecological harm; the framing retains GR 1.0's productivity ambition while adding the sustainability constraint. Statement 2 is correct: the Evergreen Revolution serves as the conceptual anchor for the GR 2.0 architecture elaborated in Parts 6 through 10.
Q6. Consider the following statements about the origin of the north-India winter stubble-burning crisis:
- The contemporary stubble-burning practice in Punjab and Haryana traces structurally to combine-harvesting of wheat that leaves standing residue and the short window between paddy harvest and wheat sowing.
- Manual harvesting of jowar and bajra in dryland Peninsular India is the primary source of north-India stubble-burning pollution.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer and explanation
Answer: 1 only
Explanation.
Correct: a (1 only). Statement 1 is correct: stubble burning in Punjab and Haryana traces to combine-harvesting of wheat and the short paddy-to-wheat rotation window that makes burning the default field-preparation choice. Statement 2 is wrong: dryland Peninsular millet cultivation and manual harvesting are not the source of north-India stubble burning; the geography of the crisis is Indo-Gangetic Plain wheat-belt, not Peninsular dryland tracts.
Sources
- Class 12 India People and Economy, Chapter 5 (Land Resources and Agriculture)
- Evergreen Revolution: M S Swaminathan concept and lineage
- Indian Council of Agricultural Research (ICAR) and NICRA programme institutional architecture
- Central Ground Water Board (CGWB) and Central Ground Water Authority (CGWA) statutory framework
- Department of Fertilizers, Ministry of Chemicals and Fertilizers, Government of India
- Department of Agriculture and Farmers Welfare (DA and FW) policy and scheme architecture
- M S Swaminathan Research Foundation institutional context
- Press Information Bureau release on sustainable agriculture and stubble-management
- Ministry of Statistics and Programme Implementation: Agricultural Statistics at a Glance
Disclaimer
This article presents the socio-economic and environmental critique of the original Green Revolution and the bridge to Green Revolution 2.0. Statistical references illustrate patterns rather than exact current-year figures. Aspirants should cross-check policy and statistical details against official Ministry of Agriculture and Central Ground Water Board sources.
