This MCQ module is based on: Land Degradation, End-of-Book Exercises & Conclusion
TOPIC 27 OF 27
Land Degradation, End-of-Book Exercises & Conclusion
🎓 Class 12
Social Science
CBSE
Theory
Chapter 9 — Geographical Perspective on Selected Issues and Problems
⏱ ~30 min
🌐 Language: [gtranslate]
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Land Degradation, Conservation Solutions, Conclusion & Exercises
NCERT India: People and Economy — Unit V, Chapter 9 (Part 3 — Final)
9.8 Land Degradation — The Slow Death of the Soil
Pressure on agricultural land does not increase only because the area available is limited — it increases also because the quality of the available land is deteriorating. Soil erosion, waterlogging, salinisation and alkalinisation together drive what NCERT calls land degradation. The chapter asks a striking question: “What happens if land is consistently used without managing its fertility?” The answer is that productivity declines and, given enough time, the land becomes unfit for cultivation altogether.
Definition — Land Degradation
Land degradation is generally understood as a temporary or permanent decline in the productive capacity of the land. Although all degraded land may not be wasteland, the unchecked process of degradation can convert healthy soil into wasteland over time.
Two Sources of Degradation — Natural & Human
The National Remote Sensing Centre (NRSC)? has classified India’s wastelands using satellite imagery. NCERT groups these into three categories — depending on whether the cause is natural, mixed or man-made.
| Origin | Wasteland Types | Example Regions |
|---|---|---|
| Natural | Gullied / ravinous land; desertic or coastal sands; barren rocky areas; steep sloping land; glacial areas | Chambal ravines; Thar desert; coastal Konkan-Malabar; high Himalaya |
| Natural + Human | Waterlogged and marshy areas; saline and alkaline lands; land with or without scrub | Punjab-Haryana canal-irrigated belt; Sundarbans; semi-arid plateau |
| Human-induced | Degraded shifting-cultivation area; degraded plantation crops; degraded forests & pastures; mining and industrial wastelands | North-East jhum tracts; Jharkhand-Odisha mining belts; over-grazed Aravallis |
NCERT’s key conclusion: “wastelands caused by man-made processes are more important than those caused by natural processes”. In other words, the soil is not failing us — we are failing the soil.
The Major Forms of Land Degradation
Water Erosion
Removal of topsoil by rainfall and surface run-off. Severe forms include sheet erosion (uniform thinning of the soil layer), rill erosion (small channels), gully erosion (deep cuts as in the Chambal ravines of MP-Rajasthan-UP) and landslides on steep slopes.
Wind Erosion
Topsoil blown away from arid and semi-arid plains. The Thar desert of Rajasthan and parts of Gujarat are the worst affected, especially after over-grazing has stripped the vegetation cover.
Waterlogging
Excess irrigation water without drainage raises the water table to the root zone. Common in canal-irrigated belts of Punjab and Haryana — ironic that the green-revolution heartland faces this problem.
Salinisation & Alkalinisation
As waterlogged soil dries, dissolved salts come to the surface, forming a white crust (kallar / reh / usar). About 60 lakh ha in India are reported affected by salinity / alkalinity, mostly in canal-irrigated tracts.
Other important forms include mining waste (open-cast pits and overburden in Jharkhand, Odisha, Chhattisgarh), deforestation (which removes the protective canopy and the binding root mat), and urban sprawl on agricultural land (concrete replacing topsoil at the city edge). India is reported to lose roughly 5.3 billion tonnes of topsoil every year to erosion alone — an enormous slow-motion drain on the country’s productive base.
Fig 9.5 — Types of Land Degradation in India
Chart 9.5 — Indicative Annual Soil Loss by Region of India (Tonnes/Hectare)
India loses about 5.3 billion tonnes of topsoil per year. The Western Himalaya, the Shivalik foothills and the Deccan ravines are worst affected. The Gangetic alluvial plains lose less per hectare because of gentle slopes and high vegetation cover.
Fig 9.6 — Soil Erosion Mechanism — A Cross-Section
Causes of Land Degradation
The forces that drive degradation cluster into a few broad heads:
- Deforestation — for fuelwood, fodder, shifting cultivation and timber. Each lost hectare exposes the soil to erosion.
- Over-grazing — livestock pressure beyond carrying capacity, especially on community pastures (CPRs).
- Faulty agricultural practices — mono-cropping, ploughing along the slope, excessive ploughing, removal of crop residue, over-irrigation.
- Mining and quarrying — open-cast pits, dumps and contamination from acid mine drainage.
- Industrialisation and urban sprawl — converting alluvial farmland to factories, housing societies and highways.
National Mission for Soil Health (2014)
The Soil Health Card Scheme, launched in 2015, issues each farmer a printed card with the nutrient status of his or her soil and crop-wise fertiliser recommendations. The aim is to discourage blanket use of urea, encourage micro-nutrient management and prevent further degradation of agricultural land.
Source — The Jhabua Watershed Programme
NCERT presents Jhabua district (one of the five most backward districts of India, in the westernmost agro-climatic zone of Madhya Pradesh) as a successful example of community participation in land restoration. Read the case, then answer: how did government-NGO partnership combine with Bhil community action to restore the common-property resources of Petlawad block?
Worked answer:
The watershed management programme funded by the Ministry of Rural Development (implemented by the Rajiv Gandhi Mission for Watershed Management) treated 20% of Jhabua district’s area in five years. The Bhils of Sat Rundi hamlet (Karravat village) revitalised their common property by: (i) each household planted and maintained one tree on the common land; (ii) they planted fodder grass on the pasture and adopted ‘social fencing’ for two years — meaning no open grazing, only stall-feeding; (iii) when an outsider encroached, the villagers responded not with violence but by offering him membership of the user group in exchange for sharing the benefits. The lesson: degraded common property can be restored when community ownership, technical inputs and sustained programme support come together.
9.9 Conservation Solutions — Restoring the Land
If land can be degraded by faulty practice, it can also be restored by careful practice. Land conservation is the art of making the soil produce well today without ruining it for tomorrow. The standard toolkit for India combines biological, mechanical and policy measures.
Afforestation & Social Forestry
Plant indigenous trees on degraded land, road sides, school grounds and along canal banks. Social forestry uses community land to grow fodder, fuelwood and small-timber trees for local use.
Contour Ploughing & Terrace Farming
Ploughing across the slope (not up-and-down) and cutting the slope into step-like terraces reduces velocity of water run-off — a classic technique on the lower Himalayas, the Western Ghats and the Nilgiris.
Watershed Management
Treats the entire drainage basin as a unit — ridge-to-valley planning, gully plugs, check-dams, pond rehabilitation, alternate land use. Acknowledges the linkage between land, water and vegetation; builds livelihoods through community participation.
Organic Farming & Crop Rotation
Replace chemical fertiliser with farmyard manure, vermicompost and green-manure crops. Rotate cereals with legumes that fix atmospheric nitrogen. Reduces salinisation and restores soil microbial life.
Other measures include strip cropping (alternating soil-binding strips with cultivated strips), shelter belts (rows of trees that block wind, especially on the western edge of the Thar), controlled grazing, mining-area reclamation (back-filling of pits and replanting), regulation of urban sprawl through master plans, and the Soil Health Card Scheme that we have already met. Done together, these measures can stop the bleeding and slowly start to rebuild the country’s soil capital.
Fig 9.7 — A Framework for Sustainable Land Management
9.10 Conclusion — A Geographer’s Synthesis
Through this chapter we have traced the four-headed dragon of contemporary India: pollution, urban waste, migration-with-slums, and land degradation. They look like four separate problems, but on close inspection they reveal a single underlying truth — the speed and scale of India’s economic growth has outrun the capacity of its natural and institutional systems to absorb that growth.
Geography offers an integrated perspective on this truth. It sees the same place as physical (rivers, soils, climate), social (caste, gender, class), economic (factories, farms, services) and institutional (laws, plans, missions) all at once. Air pollution in Delhi, slum-formation in Dharavi, gully erosion in Chambal and arsenic in West Bengal cannot be solved by single-sector ministries acting in isolation — only by an integrated, place-based, sustainable approach.
The Path Forward — Sustainable Development
Sustainable development means meeting the needs of the present without compromising the ability of future generations to meet their own needs. For India, it means: cleaning rivers without choking industry; absorbing migrants while upgrading slums; expanding agriculture while restoring soils; growing cities while keeping the air breathable. The lesson of every case study in this chapter — from Daurala to Jhabua to Dharavi — is that the answers exist when government, civil society and citizens act together.
Discuss — What does ‘sustainable’ mean for you?
Form pairs in the class. Each pair picks one item from the chapter (eg. air, water, slum, soil) and lists three actions they personally can take in the next month to reduce its degradation. Then share with the class. Are individual actions enough? If not, what level of action — community, city, state or nation — is required?
Pointers: Personal actions matter (carrying a cloth bag, segregating waste, cycling instead of driving, planting a tree, avoiding firecrackers, conserving water). But for systemic problems — fixing 200 km of polluted Yamuna, redeveloping Dharavi, restoring 60 lakh ha of saline land — institutional and policy action at city, state and central level is essential. The right answer is ‘both’: individual habits create the political demand for institutional action, and institutional action gives individual habits a chance to scale.
Competency-Based Questions — Land Degradation & Conservation
Case Study: Asha is a soil scientist deputed to a 5,000-ha block in Chambal valley (Madhya Pradesh-Rajasthan-UP border) where ravines have eaten into farmland for generations. The block also has heavy out-migration to Delhi and a number of saline patches near a canal command. The state government wants Asha to design an integrated programme that addresses gully erosion, salinisation and the labour shortage caused by out-migration. Use this case to answer the questions below.
1. Which one of the following is NOT a process of land degradation?
L1 Remember
Answer: (c) Photosynthesis. Photosynthesis is the biological process by which plants build organic matter — it is in fact the basis of soil fertility, not its destruction. The other three are listed by NCERT among the major degradation processes.
2. Why does NCERT say that “wastelands caused by man-made processes are more important than those caused by natural processes”?
L4 Analyse
Answer: Three reasons. First, scale: man-made wastelands — degraded forests, over-grazed pastures, mining waste, salinised canal-irrigated tracts, urban encroachment — cover a far larger total area than naturally barren rocky or glacial areas. Second, reversibility: human-made degradation can in principle be reversed by changing human practice (afforestation, watershed management, organic farming) — while glacial or coastal-sand wastelands cannot. Third, productivity: man-made wastelands were once productive farmland; their loss directly reduces India’s food security, while naturally barren land was never productive in the first place.
3. Compare gully erosion in the Chambal ravines with salinisation in canal-irrigated Punjab on (i) cause, (ii) symptoms, (iii) remedy.
L5 Evaluate
Answer: Cause: Chambal ravines are caused by water erosion on bare soft sediments after deforestation; Punjab salinisation is caused by over-irrigation without drainage, raising the water table and bringing dissolved salts to the surface. Symptoms: deep U-shaped gullies and badland topography in Chambal; white salt crust (kallar/reh), reduced crop yields and patchy bare ground in Punjab. Remedy: Chambal needs check-dams, gully plugs, plantation on slope shoulders and rotational grazing; Punjab needs tile drainage, controlled irrigation, gypsum amendment and shift to less water-demanding crops. Same outcome (degraded land), opposite engineering responses.
4. Imagine you are designing the next-generation of the Soil Health Card Scheme. Suggest three improvements that integrate the lessons of NCERT’s case study on Jhabua.
L6 Create
Model answer: Improvement 1 — Watershed-level cards: in addition to a per-farm card, issue a per-watershed card showing the run-off, erosion and salinity hot-spots, so that village user-groups can plan ridge-to-valley action together. Improvement 2 — Pair-with-NGO mode: like Jhabua’s government-NGO partnership, every Soil Health Card should come bundled with a 2-year facilitator from a credible NGO who guides actual practice (compost-pits, contour bunds, social fencing). Improvement 3 — CPR coverage: extend the card from individual farms to common property resources (pastures, ponds, forest fringes), with collective rewards for the user group when soil organic carbon improves over a baseline.
HOT — A district collector argues that land degradation is best solved through legal action against polluters and encroachers, not through community programmes. Argue for or against this position.
L5 Evaluate
Answer: The collector is half right. Legal action is necessary — the polluter-pays principle of the Daurala case, the Forest Conservation Act of 1980 and the Environment Protection Act of 1986 give the state real teeth against gross violators. But it is not sufficient. The Jhabua case shows that ownership of the land has to lie with the community for restoration to be sustainable. Legal action without community engagement produces compliance for one season and reversion the next. The right answer is both: enforce the law against deliberate offenders and empower watershed-user groups, women’s self-help groups, gram sabhas to manage CPRs. India’s best success stories — Ralegan Siddhi, Hivre Bazar, Jhabua — show this combination at work.
Assertion & Reason — Land Degradation & Solutions
Assertion (A): Watershed management programmes link land, water and vegetation in a single planning unit.
Reason (R): A watershed is the natural drainage basin of a stream — activities anywhere within it affect run-off, erosion and groundwater recharge for the whole basin.
Reason (R): A watershed is the natural drainage basin of a stream — activities anywhere within it affect run-off, erosion and groundwater recharge for the whole basin.
Correct: (A) — NCERT explicitly says watershed management “acknowledges the linkage between land, water and vegetation and attempts to improve livelihoods…through natural resource management and community participation.” R is the geographical reason for that linkage.
Assertion (A): Salinisation of soil is widely reported in canal-irrigated areas of Punjab and Haryana.
Reason (R): Excess irrigation water without proper drainage raises the water table, bringing dissolved salts to the surface where they accumulate as a white crust.
Reason (R): Excess irrigation water without proper drainage raises the water table, bringing dissolved salts to the surface where they accumulate as a white crust.
Correct: (A) — Both statements are true and R is the precise mechanism that produces the salinisation observed in the green-revolution heartland. About 60 lakh hectares in India are reported affected.
Assertion (A): The Bhils of Petlawad block in Jhabua restored their common-property resources successfully.
Reason (R): The villagers used social fencing of pastures and stall-feeding of cattle for at least two years.
Reason (R): The villagers used social fencing of pastures and stall-feeding of cattle for at least two years.
Correct: (A) — This is the precise NCERT description: each household planted and maintained a tree, planted fodder grass on the pasture, and the community adopted social fencing for two years. R is the operational reason for the success in A.
NCERT Exercises — Chapter 9
1. Choose the right answer of the following from the given options.
(i) Which one of the following rivers is highly polluted?
- (a) Brahmaputra
- (b) Satluj
- (c) Yamuna
- (d) Godavari
Answer: (c) Yamuna. NCERT Table 9.2 lists the Yamuna’s Delhi-to-Chambal stretch and the Mathura-Agra stretch as among the most polluted in India because of the dumping of Delhi’s domestic and industrial waste, and the heavy upstream extraction of water for irrigation.
(ii) Which one of the following diseases is caused by water pollution?
- (a) Conjunctivitis
- (b) Diarrhoea
- (c) Respiratory infections
- (d) Bronchitis
Answer: (b) Diarrhoea. NCERT explicitly mentions that the diseases commonly caused by contaminated water are diarrhoea, intestinal worms and hepatitis. Conjunctivitis is an eye infection; respiratory infections and bronchitis are caused by air pollution.
(iii) Which one of the following is the cause of acid rain?
- (a) Water pollution
- (b) Land pollution
- (c) Noise pollution
- (d) Air pollution
Answer: (d) Air pollution. Oxides of sulphur (SO₂) and oxides of nitrogen (NOₓ) released by the combustion of fossil fuels combine with atmospheric water vapour to form sulphuric and nitric acid, which fall as acid rain. NCERT also notes that the pH of the first rain after summer is consistently lower than that of subsequent rains.
(iv) Push and pull factors are responsible for —
- (a) Migration
- (b) Land degradation
- (c) Slums
- (d) Air pollution
Answer: (a) Migration. Push factors are forces that drive people away from rural areas (poverty, drought, lack of jobs, caste discrimination); pull factors are forces that draw them to urban centres (jobs, schools, hospitals, anonymity). Together they produce the rural-urban migration stream.
2. Answer the following questions in about 30 words.
(i) What is the difference between pollution and pollutants?
Answer: Pollution is the process — the release of harmful substances or energy into air, water, soil or sound systems — that damages the environment and human health. Pollutants are the substances themselves — SO₂, NOₓ, particulate matter, lead, plastic waste, untreated sewage — whose presence causes pollution.
(ii) Describe the major sources of air pollution.
Answer: The three principal sources are combustion of fossil fuels (coal, petrol, diesel), mining, and industries. These release SO₂, NOₓ, hydrocarbons, CO₂, CO, lead, asbestos, ammonia and aldehydes. Vehicular emissions, biomass burning and dust are additional Indian sources.
(iii) Mention major problems associated with urban waste disposal in India.
Answer: Indian cities generate about 1.5 lakh tonnes of solid waste daily; in non-metro cities 30-50% remains uncollected and accumulates on streets and in open spaces. Decaying waste produces foul smell and methane, harbours flies and rodents that spread typhoid, diphtheria and cholera, and leaches into rivers and groundwater — turning a local nuisance into a city-wide health hazard.
(iv) What are the effects of air pollution on human health?
Answer: Air pollution causes diseases of the respiratory, nervous and circulatory systems: asthma, chronic bronchitis, lung cancer, ischaemic heart disease, stroke and reduced child-lung development. Long-term exposure to PM2.5 lowers life expectancy in north Indian cities; lead exposure damages cognition. Acid rain damages crops, monuments and forests as a secondary effect.
3. Answer the following questions in about 150 words.
(i) Describe the nature of water pollution in India.
Model answer: Water pollution in India is shaped by four overlapping sources. Industrial effluents are the largest single contributor — leather, pulp and paper, textile and chemical units dump heavy-metal-laden waste water into rivers; sugar and distillery units add high-BOD organic load. Agricultural run-off — fertilisers, pesticides and herbicides — reaches surface water and infiltrates the groundwater, raising nitrate levels. Urban sewage from cities like Kanpur, Varanasi, Patna and Delhi is largely discharged untreated into the Ganga and the Yamuna. Cultural activities such as pilgrimage, religious fairs, idol immersion and tourism add specifically Indian sources at the Ganga, Yamuna, Cooum and Sabarmati rivers. As a result, almost all surface waters are contaminated and unfit for human consumption. Groundwater also suffers from geogenic contamination: arsenic in West Bengal-Bihar (~38 million affected) and fluoride in Rajasthan, AP, Karnataka and TN. The WHO estimates one-fourth of India’s communicable diseases are water-borne. The Namami Gange Programme, the Yamuna Action Plan and CPCB’s effluent standards are the policy responses.
(ii) Describe the problem of slums in India.
Model answer: Slums — jhuggi-jhopari clusters and shanty colonies — are residential areas of the least choice in Indian cities. They are inhabited by rural-urban migrants who could not afford proper housing in the formal market because of high land prices. They occupy environmentally incompatible and degraded patches: floodplains, railway-track edges, marshes, hill slopes. Living conditions are characterised by dilapidated housing, poor hygiene and ventilation, lack of drinking water, light and toilets, open defecation, unregulated drainage and overcrowded narrow streets. Most residents work in low-paid, high-risk-prone, unorganised sector jobs — construction labour, domestic help, sanitation, hawking. Consequently they are undernourished, prone to disease, unable to give proper schooling to their children. The poverty makes them vulnerable to drug abuse, alcoholism, crime and social exclusion. India’s slum population was about 65 million in Census 2011, with Mumbai (Dharavi, Govandi), Delhi (Bhalswa) and Kolkata leading the list. The remedy lies in in-situ redevelopment with secure tenure, universal services (water, sewerage, school, health centre) under the Swachh Bharat Mission and PMAY-Urban, and protection of the slum’s informal economy — which in Dharavi alone is estimated at about US$1 billion annually.
(iii) Suggest measures for reduction of land degradation.
Model answer: Land degradation can be checked by combining biological, mechanical, policy and community measures. Biological measures: afforestation and social forestry on degraded patches, mulching, cover-cropping, organic farming with farmyard manure and crop rotation that includes legumes. Mechanical measures: contour ploughing across the slope, terrace cultivation in the Himalayas and Western Ghats, gully-plugging and check-dams in the Chambal ravines, strip-cropping on dry plains, shelter-belts of trees on the western edge of the Thar to break the wind. Drainage and reclamation: tile drainage and gypsum amendment to recover saline-alkaline land in canal-irrigated Punjab and Haryana, back-filling of mining pits in the Jharkhand-Odisha-Chhattisgarh belt. Policy measures: Soil Health Card Scheme (2015), the National Watershed Mission, PMKSY for micro-irrigation, regulation of urban sprawl through master plans. Community participation: watershed user-groups, social fencing of common pastures (as the Bhils did in Petlawad, Jhabua), women’s self-help groups for plantation work. The Jhabua case shows that the four streams together — not any one alone — can convert wasteland into productive land within five to ten years.
Chapter Summary — Key Take-Aways
- Pollution is the release of harmful substances or energy into the environment. Four types: air, water, land and noise — classified by the medium that carries the pollutant.
- Water pollution in India comes from industrial effluents, agricultural run-off, urban sewage and cultural activities. The Ganga is worst downstream of Kanpur and Varanasi; the Yamuna is worst at Delhi.
- Groundwater is contaminated by arsenic in WB-Bihar (~38 million affected) and by fluoride in Rajasthan and the southern dry belt.
- Air pollution from fossil-fuel combustion, mining and industry causes respiratory, circulatory and nervous-system diseases. Acid rain is a secondary effect — the pH of the first rain after summer is consistently lower than that of later rains.
- Solid waste — about 1.5 lakh tonnes/day in India — is 90% collected in metros but 30-50% uncollected elsewhere; the prescription is to treat waste as a resource for energy and compost.
- Rural-urban migration is driven by poverty and drought (push) and city wages and services (pull). About 60% of urban growth is from natural increase; 29% from migration. Stream is dominated by males.
- Slums like Dharavi (Mumbai) emerge when migrants cannot afford formal housing. Solutions include in-situ redevelopment, universal services, tenure security and protection of the informal economy.
- Land degradation — soil erosion, waterlogging, salinisation, alkalinisation, mining waste, deforestation — is dominated by human-induced rather than natural causes. India loses about 5.3 billion tonnes of topsoil per year.
- Watershed management — as in Jhabua, MP — links land, water and vegetation through community participation to restore degraded common-property resources.
- The chapter closes with the conclusion that geography offers an integrated perspective on India’s challenges, and that sustainable development is the only durable way forward.
Key Terms — Glossary
PollutionRelease of harmful substances or energy into air, water, land or sound systems.
PollutantThe substance itself that causes pollution — e.g. PM2.5, SO₂, lead.
AQIAir Quality Index, a 0-500 scale by CPCB summarising daily air quality.
PM2.5 / PM10Particulate matter of 2.5 / 10 microns or smaller; deeply harmful to lungs.
Acid RainRainfall with low pH due to dissolved SO₂ and NOₓ from air pollution.
Decibel (dB)Logarithmic unit of sound level; CPCB residential limit is 55 dB(A) day.
E-wasteDiscarded electronic equipment; India is the 4th largest generator (~3.2 Mt in 2019).
Swachh Bharat Mission2014 cleanliness mission focusing on solid-waste management and sanitation.
3RReduce, Reuse, Recycle — the foundational waste-management hierarchy.
Push FactorA force that drives people away from a place (poverty, drought, conflict).
Pull FactorA force that attracts people to a place (jobs, schools, hospitals).
SlumResidential area of least choice with poor hygiene, ventilation and amenities.
DharaviMumbai slum often called Asia’s largest, ~1 million people in ~1.7 km².
Land DegradationTemporary or permanent decline in productive capacity of land.
Soil ErosionRemoval of topsoil by water, wind or gravity — sheet, rill, gully, landslide.
SalinisationBuild-up of soluble salts in topsoil from waterlogging in canal-irrigated areas.
WaterloggingExcess water at the root zone due to over-irrigation without drainage.
WatershedThe natural drainage basin of a stream — the unit for integrated land-water planning.
WastelandDegraded, unproductive land mapped by the National Remote Sensing Centre.
Sustainable DevelopmentMeeting present needs without compromising future generations’ needs.
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