**CHAPTER 9: GEOGRAPHICAL PERSPECTIVE ON SELECTED ISSUES AND PROBLEMS**
**ENVIRONMENTAL POLLUTION: DEFINITION & CLASSIFICATION**
• Environmental Pollution: Release of substances and energy from waste products of human activities into the environment, causing degradation of air, water, land, or increase in noise levels.
• Four Main Types of Pollution (classified by medium of transport):
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**WATER POLLUTION: SOURCES & IMPACTS**
• Definition: When concentration of suspended particles, organic and inorganic substances in water exceeds safe limits, exceeding self-purifying capacity of water body
• Natural Sources: Erosion, landslides, decay and decomposition of plants and animals (minor concern)
• Human Sources (Primary Concern):
• Major Pollutants in Water:
• Most Polluting Industries: Leather, pulp and paper, textiles, chemicals
• Disposal Methods: Industrial waste dumped in running water/lakes → poisonous elements reach reservoirs and water bodies → destruction of bio-system
**CASE STUDY: GANGA RIVER POLLUTION (Critical for Map-Based Questions)**
• Affected States: Uttar Pradesh, Bihar, West Bengal
• Polluted Stretches:
• Major Polluting Cities: Kanpur, Prayagraj, Varanasi, Patna, Kolkata (release domestic waste directly)
• Causes of Pollution:
• Health Impact: Water-borne diseases (diarrhoea, intestinal worms, hepatitis, typhoid)
• WHO Data: Approximately 1/4 of communicable diseases in India are water-borne
**CASE STUDY: YAMUNA RIVER POLLUTION**
• Affected Regions: Delhi and Uttar Pradesh (Mathura, Agra stretch)
• Major Polluted Sections:
• Causes:
**AGRICULTURAL POLLUTION: CHEMICAL IMPACT**
• Modern Agriculture Chemicals: Inorganic fertilisers, pesticides, herbicides
• Pollution Pathway: Chemicals washed down to rivers/lakes → infiltrate soil → reach groundwater → bioaccumulation in food chain
• Effects:
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**AIR POLLUTION: DEFINITION & SOURCES**
• Definition: Addition of contaminants (dust, fumes, gas, fog, odour, smoke, vapour) to air in substantial proportion and duration harmful to flora, fauna, and property
• Primary Sources:
• Major Air Pollutants:
• Health Impacts: Diseases of respiratory system (asthma, bronchitis), nervous system, circulatory system (heart disease, hypertension)
• Urban Smog: Smoky fog over cities formed by atmospheric pollution → extremely harmful to human health
• Acid Rain Formation:
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**NOISE POLLUTION: CHARACTERISTICS & SOURCES**
• Definition: State of unbearable and uncomfortable noise levels caused by various technological sources
• Measurement Unit: Decibels (dB) — sound level measurement
• Main Sources:
• Health Effects: Hearing loss, sleep disturbance, stress, reduced cognitive performance
• Geographic Pattern: More hazardous in metropolitan and big cities of India (Delhi, Mumbai, Bangalore, Kolkata)
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**URBAN WASTE DISPOSAL: CHALLENGES & MANAGEMENT**
• Definition of Solid Waste: Variety of old and used articles (metal scraps, broken glass, plastic containers, polythene bags, ash, CDs, floppies, electronic waste) discarded at different places
• Alternative Terms: Refuse, garbage, rubbish, municipal solid waste (MSW)
• Sources of Waste:
• Urban Waste Problems:
• Current Disposal Methods:
• Challenges:
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**NAMAMI GANGE PROGRAMME: MAJOR GOVERNMENT INITIATIVE**
• Objective: Clean the Ganga River by effectively controlling pollution for national importance
• Key Components:
• Significance: Addresses major Hindu pilgrimage site; involves 400+ million people in basin; critical for ecosystem and public health
---
**KEY STATISTICS & DATA FOR EXAM**
• Disease Data: ~1/4 of communicable diseases in India are water-borne (WHO)
• Current Status: Almost all surface water sources in India contaminated and unfit for human consumption
• Decibel Scale: Used to measure noise pollution intensity
• River Importance: Ganga flows through one of most populous regions of India
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**CBSE EXAM TIPS**
Q1. Which of the following is NOT a primary source of air pollution?
Answer: C — Afforestation actually reduces air pollution by absorbing pollutants; the other three are recognized direct sources of air pollutants.
Q2. According to the study material, what percentage of India's communicable diseases are waterborne according to WHO?
Answer: C — The text explicitly states that the World Health Organization shows about one-fourth of communicable diseases in India are water-borne.
Q3. The Yamuna River's pollution in Delhi and Uttar Pradesh is primarily caused by which combination of factors?
Answer: B — Table 9.2 identifies three interconnected sources: domestic waste discharge, water extraction reducing river flow, and agricultural runoff containing micropollutants.
Q4. Which industry is identified as the most significant contributor to water pollution in India?
Answer: C — The text explicitly names leather, pulp and paper, textiles, and chemicals as the major water-polluting industries that dispose wastes into running water.
Q5. Assertion: Nitrogen oxides released from fossil fuel combustion increase nitrate content in surface waters. Reason: Agricultural fertilizers infiltrate soil and increase groundwater nitrate levels.
Answer: B — Both statements are factually correct (air pollution + fertilizer runoff both add nitrates), but they describe different pathways to water pollution, not a cause-effect relationship.
Q6. Which of the following best explains why the self-purifying capacity of water becomes insufficient in the Ganga River near Varanasi?
Answer: B — The text states that when concentration of substances increases, the self-purifying capacity is unable to purify the water; Varanasi's multiple pollution sources (cities like Kanpur, Varanasi, and Patna) overwhelm this natural capacity.
Q7. The Namami Gange Programme includes all of the following objectives EXCEPT:
Answer: C — The programme focuses on treatment, monitoring, and afforestation—not complete industrial relocation; it manages pollution at source rather than displacing industry entirely.
Q8. If a city disposes of 5,000 tonnes of solid waste monthly but has treatment capacity for only 3,000 tonnes, what is the monthly waste disposal deficit?
Answer: B — Deficit = Generated waste − Treatment capacity = 5,000 − 3,000 = 2,000 tonnes; this reflects the urban waste crisis described in the chapter.
Q9. HOTS: Urban smog in Mumbai and air pollution diseases in industrial cities like Kanpur form a cause-effect chain. Which step in this chain is INCORRECTLY sequenced? Sequence: Fossil fuel combustion → SO₂ and NO₂ gases released → Atmospheric pollution → Smog formation → Respiratory diseases (A) All steps are correctly sequenced (B) Smog formation should occur before atmospheric pollution (C) Respiratory diseases should be listed before smog formation (D) SO₂ and NO₂ are secondary pollutants, not primary
Answer: A — The sequence is scientifically accurate: combustion releases primary pollutants (SO₂, NO₂) which accumulate as atmospheric pollution, combine with moisture/fog to form smog, which inhaled causes respiratory disease.
What is environmental pollution?
Release of substances and energy from waste products of human activities that degrades the quality of air, water, or land.
Name the four main types of pollution classified by medium.
Air pollution, water pollution, land pollution, and noise pollution.
Which industry is the most significant contributor to water pollution in India?
Industry (particularly leather, pulp and paper, textiles, and chemicals) is the largest contributor to water pollution.
What is the self-purifying capacity of water?
The natural ability of water to purify itself by breaking down pollutants, but this capacity is exceeded when pollutant concentration becomes too high.
Name three sources of water pollution from human activities.
Industrial effluents, domestic sewage, and agricultural runoff (fertilizers and pesticides).
What causes urban smog?
Atmospheric pollution from combustion of fossil fuels and industrial emissions that combine with fog particles to create smoky fog over cities.
According to WHO, what fraction of India's communicable diseases are waterborne?
About one-fourth (1/4) of India's communicable diseases are caused by contaminated water.
What is the Namami Gange Programme?
A Union Government initiative launched to clean the Ganga River through sewerage treatment, industrial monitoring, afforestation, and public awareness.
What is solid waste in urban areas?
Old and used articles like metals, glass, plastic, ash, CDs, and other discarded materials dumped in cities from household and industrial sources.
Name two diseases commonly caused by water pollution in India.
Diarrhoea, intestinal worms, and hepatitis are the main waterborne diseases caused by contaminated water.
Define environmental pollution and name the four main types of pollution classified by the medium through which pollutants are transported. [2 marks]
Environmental pollution = release of substances and energy from human waste; Four types = Air (SO₂, NO₂, CO), Water (heavy metals, sewage), Land (pesticides, waste), Noise (aircraft, vehicles).
Explain the causes of water pollution in the Ganga River and describe how the Namami Gange Programme addresses these problems with specific objectives. [5 marks]
Causes: industrial effluents (Kanpur leather industry), domestic sewage (cities Prayagraj, Varanasi, Patna, Kolkata), ritual dumping of carcasses. Namami Gange responses: (1) sewerage treatment systems in towns, (2) industrial effluent monitoring, (3) afforestation of banks, (4) Ganga Grams development, (5) public awareness campaigns—each objective directly targets one pollution source or consequence.
Analyse the relationship between industrial activities, agricultural practices, and water quality degradation in the Yamuna River. How does this case study illustrate the self-purifying capacity concept? Support your answer with specific examples and explain why the WHO reports that one-fourth of India's communicable diseases are waterborne. [6 marks]
Industrial activities: Delhi domestic sewage discharge + Mathura chemicals; Agricultural: Haryana/UP irrigation extraction + micropollutant runoff from fertilizers/pesticides. Self-purifying capacity concept: river's natural decomposition ability (microbial action, dilution, sedimentation) is exceeded when pollutant concentration exceeds threshold—demonstrated by Yamuna's inability to recover despite flowing downstream. Waterborne diseases (diarrhoea, hepatitis, intestinal worms) result because contaminated water reaches human consumption sources; explain the pathway: pollutants → drinking water → pathogenic bacteria/microbes → disease. Use Table 9.2 Yamuna data and WHO statistic to support multi-step argument about how industrial + agricultural pollution overwhelms natural cleansing mechanisms, causing disease.
Q1. Assertion (A):
Water pollution in India has increased primarily due to industrial expansion and population growth rather than natural sources.
Reason (R):
Natural sources like erosion and decomposition are minor compared to human activities such as sewage disposal and industrial waste.
Answer: A — Both A and R are true, and R is the correct explanation of A — Both the assertion and reason are true, and the reason correctly explains why pollution has increased—human activities overwhelmingly outweigh natural sources as stated in the chapter.
Q2. Assertion (A):
The Ganga river is more polluted than the Yamuna river in India.
Reason (R):
The Ganga flows through one of the most populous regions of India, receiving domestic waste from major cities like Kanpur, Varanasi, and Kolkata.
Answer: B — Both A and R are true, but R is NOT the correct explanation of A — While both statements are true (the reason is factually correct about population and cities), the assertion cannot be confirmed as definitively true from the chapter—pollution severity cannot be directly compared between the two rivers. The reason does not explain why Ganga is more polluted.
Q3. Assertion (A):
Air pollution causes diseases related to respiratory, nervous, and circulatory systems.
Reason (R):
Air pollutants such as carbon monoxide and particulate matter directly enter the bloodstream through lung absorption.
Answer: C — A is true but R is false — The assertion is true (stated in the chapter), but the reason is oversimplified and mechanistically incorrect—the chapter does not explain the physiological mechanism of disease causation in this detail. The reason provides incorrect medical explanation.
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Case Study:
A city in Uttar Pradesh has 15 lakh residents and limited sewage treatment infrastructure. The city's primary water source is a river that also receives effluent from a leather tanning industry and agricultural runoff from surrounding farms. Recent water quality tests show elevated levels of ammonia, nitrates, chlorides, and heavy metals like lead and mercury. Local health officials report increased incidence of diarrhea, intestinal worms, and hepatitis among residents. The city's drinking water treatment plant can filter suspended solids but cannot remove dissolved heavy metals or nitrates effectively.
Q1. Based on Table 9.1, which sources of pollution are contributing to the elevated contaminant levels detected in the city's water?
Answer: C
Q2. The water treatment plant's inability to remove heavy metals and nitrates suggests:
Answer: B
Q3. The increased disease rates (diarrhea, worms, hepatitis) in the city are consistent with the chapter's statement that:
Answer: B
Q4. To address this multi-source pollution problem following the Namami Gange Programme model, the city should prioritize:
Answer: C
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Real CBSE board exam questions from past papers — free to attempt.
CBSE 2026 · Set 64/1/1 · 1 mark
The loudness of the sound is measured in the unit known as:
CBSE 2026 · Set 64/1/2 · 1 mark
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CBSE 2026 · Set 64/1/2 · 1 mark
The 'North-South Corridor' connects which of the following set of cities ?
CBSE 2026 · Set 64/1/2 · 1 mark
Two statements are given below. They are Assertion (A) and Reason (R). Read both the statements carefully and choose the correct option : Assertion (A) : All the developed countries have opened their markets for products from developing countries. Reason (R) : World Trade Organisation deals with the global rules of trade between nations.
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CBSE 2026 · Set 64/1/2 · 5 marks
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Choose the correct option related to 'entrepot port':
CBSE 2026 · Set 64/1/3 · 1 mark
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CBSE 2026 · Set 64/1/3 · 1 mark
The 'East-West Corridor' connects which of the following set of cities?
CBSE 2026 · Set 64/1/3 · 1 mark
Two statements are given below. They are Assertion (A) and Reason (R). Read both the statements carefully and choose the correct option: Assertion (A): All the developed countries have opened their markets for products from developing countries. Reason (R): World Trade Organisation deals with the global rules of trade between nations.
CBSE 2026 · Set 64/1/3 · 5 marks
Railway is the mode of land transport for bulky goods and passengers over long distances. In the context of this statement, explain the significance of railways in the world.
CBSE 2026 · Set 64/1/3 · 5 marks
Analyse the role of air transport in 'international trade' of India.
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