Class 12 Geography (India-People and Economy) Chapter 9 Geographical Perspective On Selected Issues And Problem

Key Concept: Migration Impact

b) Increased demand for urban infrastructure

[Solution Description] Rural-urban migration leads to an increased demand for urban infrastructure because as more people move to cities, there is a greater need for housing, transportation, sanitation, and other public services.

Key Concept: Water Contaminants

c) Mercury

[Solution Description] Industrial wastewater from chemical industries often contains heavy metals such as mercury. This is due to the use of various chemicals and processes that introduce these contaminants into the water. Mercury, specifically, is known for its toxicity and persistence, making it a significant concern for water pollution.

Key Concept: Urban vs Rural Waste

b) 30-50\%

[Solution Description] Urban areas generate both organic and inorganic waste. Inorganic waste includes plastics, metals, glass, etc., which are not biodegradable. Typically, about 30-50\% of urban waste is inorganic, comprising materials that do not decompose quickly and pose disposal challenges.

Key Concept: Noise Measurement Units

b) Decibels

[Solution Description] Noise pollution is measured using the unit of decibels (dB). The decibel scale quantifies the intensity of sound by comparing it to a reference level, making it suitable for measuring various types of noise.

Key Concept: Urbanization Effects, Land Degradation Processes

b) Expansion of cities into agricultural lands causing soil erosion.

[Solution Description] Urbanization often leads to deforestation for expanding city boundaries, resulting in soil erosion due to lack of vegetation. The construction activities may also compact the soil, reducing its fertility and leading to degradation over time. This scenario involves understanding how urban expansion directly causes land degradation through multiple interconnected processes.

Key Concept: Noise Measurement

c) 85 dB

[Solution Description]

Prolonged exposure to noise levels above 85 decibels (dB) can potentially cause hearing damage. This is often seen in loud environments such as industrial settings or concerts without proper ear protection.

Key Concept: Inference from Case Study

a) Increased financial support through remittances

[Solution Description] When an individual migrates from a rural area to an urban setting, the socio-economic impact on their family may include increased remittances sent back home. However, this could also lead to a temporary increase in dependency on other household members while they adjust to the loss of a workforce member.

Key Concept: Pollution and Technology, Pollution and Noise Pollution Management

a) Electric vehicles

[Solution Description] Various technologies have been developed to mitigate noise pollution in urban areas. Electric vehicles (EVs) are notably effective as they produce significantly less noise compared to traditional combustion engines. Additionally, sound barriers along highways and the use of double-glazed windows in buildings also contribute to noise reduction. However, among these options, electric vehicles directly target the primary source of traffic noise, making them one of the most effective solutions.

Key Concept: Simple Cause and Effect

c) Causes migration to urban areas

[Solution Description] Poverty leads to inadequate living conditions and limited economic opportunities, causing individuals to migrate to urban areas in search of better prospects.

Key Concept: Urbanization and Waste, Pollution Control Programs

d) Worsening of air pollution

[Solution Description] In rapidly urbanizing areas, improper waste management can lead to increased environmental pollution, affecting air, water, and soil quality. Specifically, it can exacerbate air pollution by increasing emissions from decomposing waste and burning garbage. Furthermore, without effective waste disposal, there is a high risk of contamination in local water bodies, leading to diseases such as diarrhoea and typhoid. The Namami Gange Programme aims to tackle such issues by enhancing sewage treatment infrastructure to prevent river pollution. Thus, worsening air pollution due to mismanaged urban waste is a significant concern.

Key Concept: Migration Dynamics, Socio-Economic Divide

c) It contributes to congestion and poor living conditions in mega cities.

[Solution Description] Bypassing smaller cities for mega cities often leads to a concentration of resources and infrastructure in larger urban centers. This can exacerbate the socio-economic divide as smaller cities might lack development leading to increased slums in mega cities. In rural areas, this migration pattern may cause labor shortages and demographic shifts impacting agricultural productivity. A comprehensive impact assessment would consider these factors along with economic policies aiming at balanced regional growth.

Key Concept: Cause and Effect

c) It leads to respiratory diseases.

[Solution Description] The combustion of fossil fuels releases various pollutants such as carbon monoxide (CO), oxides of nitrogen (NOx), sulfur dioxide (SO2), and particulate matter. These pollutants can cause respiratory diseases such as asthma, lung cancer, and chronic obstructive pulmonary disease (COPD). They also contribute to the development of cardiovascular diseases by affecting the circulatory system.

Key Concept: Impact Analysis

c) By fostering collaboration and shared responsibilities among community members

[Solution Description] Community participation allows for collective decision-making and responsibility sharing. When communities actively engage in managing common property resources, they can develop customized solutions that cater to local needs and ensure sustainable management. This involvement fosters a sense of ownership and accountability among community members, which is crucial for the long-term upkeep and revitalization of these resources.

Key Concept: Pollution Sources

b) Combustion of fossil fuels

[Solution Description]

Combustion of fossil fuels releases numerous harmful pollutants including sulfur dioxide, nitrogen oxides, and particulates, which can contribute to cardiovascular issues. This is due to their ability to penetrate deep into the lungs and enter the bloodstream, causing inflammation and other adverse effects on heart health.

Key Concept: Pollution Effects

c) It causes eutrophication

[Solution Description] Agricultural runoff often contains fertilizers and pesticides, which can leach into water bodies. The presence of these chemicals in water can lead to eutrophication, disrupting aquatic ecosystems by causing excessive growth of algae and depletion of oxygen.

Key Concept: Source Impact

b) Combustion of fossil fuels

[Solution Description] The primary source of hydrocarbons in urban areas is the incomplete combustion of petrol and diesel used in vehicles. These hydrocarbons contribute to smog formation and pose health risks.

Key Concept: Migration Statistics

c) 60\%

[Solution Description]

To solve this problem, we need to understand the components contributing to urban population growth. Urban population can grow due to three main factors: natural increase, net in-migration, and reclassification of areas. Assuming that natural increase and net in-migration are the primary contributors, let us consider plausible estimations based on historical data trends for migration studies which usually show these two together accounting for a significant portion of urban growth.

$$\text{Combined contribution} = \text{Natural Increase} + \text{Net In-Migration} = 60\%$$

Hence, about 60\% of urban growth is attributable to these two factors combined.

Key Concept: Pollution Pathways

c) Surface runoff

[Solution Description] Fertilizers applied to agricultural lands can be transported to nearby rivers and lakes through surface runoff. During rain events, water flows over the surface of fields, picking up fertilizers and carrying them into water bodies.

Key Concept: Technological Innovations, Global Perspectives

b) Both Assertion and Reason are true, but Reason is NOT the correct explanation of Assertion.

[Solution Description] Plasma gasification is indeed gaining traction in some Asian countries because it offers a solution to the growing problem of diversified waste. This technology operates at extremely high temperatures, allowing it to effectively decompose a wide range of waste types, converting them into syngas and slag. The reason mentions the technical efficiency of plasma gasification, which is accurate; however, the assertion about its adoption specifically in Asian countries does not directly follow from the explanation of how plasma gasification works. Thus, while both statements are true, the Reason does not adequately explain the Assertion.

Key Concept: Real-world Application, Long-term Impact

b) Initiating comprehensive educational programs

[Solution Description] Addressing the root causes of poverty and improving basic amenities such as sanitation and education will have the most profound long-term effects on sustainable development in urban slums. Relocation might solve immediate issues but could cause social disruption. Health campaigns are essential but only part of a holistic approach. Temporary shelters do not provide lasting solutions without addressing foundational needs.

Key Concept: Pollution Consequences

b) Decreased fish population

[Solution Description] Improper disposal of chemical residues, such as those from industries like chemicals and textiles, can significantly increase water pollution. These chemicals often contain hazardous substances that contaminate the water, leading to decreased oxygen levels which affect aquatic life. This increased toxicity can result in a decrease in the population of fish and other aquatic organisms.

Key Concept: Cause and Effect

c) Water pollution

[Solution Description] The improper disposal of urban waste in densely populated areas leads to various environmental issues. One significant problem is water pollution, as waste can seep into water bodies and contaminate them. Overcrowded cities often face challenges with managing waste effectively, which results in pollutants entering rivers and lakes, affecting the quality of water.

Key Concept: Advanced Source Analysis, Complex Cause-Effect

d) Leather industry

[Solution Description] Among the industries listed, the leather industry is known for producing significant amounts of hazardous effluents during tanning processes, which contain toxic chemicals such as chromium. This poses serious environmental challenges if not properly managed. Immediate regulatory actions, including stringent treatment requirements before discharge, can mitigate these impacts. The complex nature of tannery waste necessitates multifaceted management approaches.

Key Concept: Economic Challenges

c) Low wages and job instability

[Solution Description] Rural migrants often face job instability when they settle in urban slums due to the informal nature of employment available. This leads to low wages and irregular income, making it difficult for them to secure a stable livelihood.

Key Concept: Migration Patterns

c) Rural to urban migration

[Solution Description] Rural to urban migration is a primary factor contributing to slum development. Migrants move to urban areas in search of better employment opportunities but often find themselves in low-paid jobs and unable to afford formal housing, leading them to settle in slums.

Key Concept: Health Hazards

c) Typhoid

[Solution Description] The syllabus mentions diseases such as typhoid, diphtheria, malaria, and cholera being spread by waste. Typhoid is one example related to waste mismanagement.

Key Concept: Industrial Contribution

b) Automotive Industry

[Solution Description] Lead is a toxic metal that was historically added to gasoline to improve engine performance. The automotive industry contributed significantly to lead emissions when leaded gasoline was used extensively. Although many countries have phased out leaded gasoline, remnants of its use, along with activities like mining and battery manufacturing, continue to contribute to lead emissions in the environment.

Key Concept: Industrial Impact

d) Chemicals

[Solution Description] The chemical industry is well-known for releasing pollutants into water bodies, making it a significant contributor to water pollution.

Key Concept: Intermediate Cause and Effect

c) Improvement in agricultural productivity

[Solution Description] Effective watershed management programs enhance water retention and improve soil quality, leading to increased agricultural productivity. By preventing erosion and conserving water, these programs support sustainable farming practices that benefit local farmers.

Key Concept: Impact of Land Degradation

c) It decreases agricultural productivity.

[Solution Description] Land degradation lowers the productive capacity of the land by reducing soil fertility, increasing salinity, and causing soil erosion. This leads to decreased yields in crops grown on degraded lands. Hence, the correct answer is a decrease in agricultural productivity.

Key Concept: Pollution and Culture, Pollution and Health

c) Disposal of ritual waste directly into the river.

[Solution Description] Ritual activities often involve the disposal of organic and inorganic substances directly into the river as part of religious ceremonies. This practice introduces pathogens and toxic compounds into the water, increasing the risk of waterborne diseases such as diarrhea and hepatitis among communities relying on the river for daily needs.

Key Concept: Waste Disposal Methods

a) Landfill

[Solution Description] Landfilling is one of the most common methods used for disposing of solid waste in urban areas due to its ability to manage large volumes of waste efficiently. Incineration, composting, and recycling are also used but landfills remain predominant.

Key Concept: Noise and Construction

d) Man-made

[Solution Description] Mechanized construction work involves heavy machinery and tools which create significant noise levels. This is a form of man-made noise pollution as it originates from human activities rather than natural sources.

Key Concept: Advanced Chemical Analysis, Policy Evaluation

b) 6 ppm

[Solution Description] To find the new concentration of $$SO_2$$, we first need to calculate the reduction amount and then subtract it from the original concentration.

The original concentration of $$SO_2$$ is 20 ppm. With a reduction of 70\%, the amount reduced is:

$$0.7 \times 20 = 14 \text{ ppm}$$

Subtracting this from the original concentration gives:

$$20 – 14 = 6 \text{ ppm}$$

Therefore, the new concentration of $$SO_2$$ is 6 ppm.

Key Concept: Policy Understanding

b) National Clean Air Programme (NCAP)

[Solution Description]

The National Clean Air Programme (NCAP) in India is a comprehensive policy initiative aimed at controlling air pollution, specifically targeting the reduction of industrial emissions along with other sources. It involves establishing a time-bound national level strategy to tackle the increasing air pollution problem across the country.

Key Concept: Syntax Recognition

b) //

[Solution Description] In the C programming language, single-line comments are created using two forward slashes “//”. This means that anything following these symbols on the same line will be treated as a comment, and it will not be executed by the compiler.

Key Concept: Slum Area Problems

c) Inadequate sanitation facilities

[Solution Description] Slum areas are characterized by overcrowding, inadequate infrastructure, and limited access to essential services such as clean water and sanitation, which often leads to severe health problems for residents.

Key Concept: Policy Analysis, Real-world Application

c) Enforcing stringent industrial effluent monitoring

[Solution Description] Analyzing the core strategies of Namami Gange Programme reveals key policies such as comprehensive afforestation, robust effluent treatment regulations, and community involvement initiatives. For application to other rivers, a holistic approach considering ecological preservation, industrial regulation, and public participation is essential.

Key Concept: Mitigation Strategies

b) Implementing buffer strips

[Solution Description] Buffer strips, which are vegetated areas planted along the edges of fields, are effective at trapping sediment and absorbing excess nutrients before they can reach water bodies. By doing so, they significantly reduce phosphorus runoff.

Key Concept: Concept Application

b) Salinisation due to accumulation of salts on the surface

[Solution Description]

Waterlogging occurs when there is excessive moisture in the soil, leading to reduced oxygen availability for plant roots. This condition hinders plant growth and can lead to salinisation, where soluble salts accumulate at the surface. Therefore, salinisation is a direct consequence of waterlogging.

Key Concept: Infrastructure Challenges, Environmental Degradation, Urban Planning

a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

[Solution Description]

The assertion discusses the issue of urban infrastructure not being able to handle the rapid increase in population, which contributes to environmental problems such as pollution and resource depletion. This is true because when cities grow quickly without adequate infrastructure, waste management and other services suffer, increasing environmental degradation.

The reason provided states that effective urban planning is essential for sustainability and reducing environmental harm. This is also true as comprehensive urban planning can balance growth demands with environmental conservation efforts, minimizing negative impacts.

In this case, both statements are true, and the reason correctly explains why urban infrastructure struggles by emphasizing the role of planning in managing growth sustainably.

Therefore, the correct answer is option (a).

Key Concept: Real-world Application, Case Study Analysis

a) High concentrations of ammonia, hydrocarbons, and lead

[Solution Description]

Freshwater lakes are highly susceptible to specific pollutants that degrade water quality. Ammonia, hydrocarbons, and heavy metals such as lead can be particularly harmful due to their toxic effects on aquatic ecosystems. High levels of ammonia can lead to eutrophication, hydrocarbons can cause oil spills, and lead can accumulate in organisms causing bioaccumulation.

Key Concept: Noise Measurement

d) All of the above

[Solution Description] The intensity of noise pollution from vehicular traffic is influenced by multiple factors such as vehicle type, road condition, and vehicle condition. These factors contribute to the variations in the noise levels experienced in different scenarios.

Key Concept: Agricultural Chemicals

b) By contaminating water with toxic substances

[Solution Description] Herbicides are chemicals used to control unwanted plants. When applied, they can run off into nearby water bodies, leading to contamination that harms aquatic life and affects water quality.

Key Concept: Waste Impact

c) Destruction of aquatic ecosystems

[Solution Description] Industrial waste can have a significant impact on water bodies by introducing pollutants. These pollutants can deplete the oxygen levels, disrupt aquatic ecosystems, and damage plant and animal life. A common consequence is the destruction of aquatic habitats and ecosystem imbalance.

Key Concept: Process Understanding

b) Deforestation

[Solution Description] The hilly regions, such as those found in the Jhabua district, are often prone to soil erosion due to deforestation. Trees and vegetation cover help to hold soil together, and when they are removed, the soil becomes loose and more susceptible to being washed away by rainwater. This makes deforestation a significant cause of soil erosion in these areas.

Key Concept: Pollution Mitigation, Urban Waste Disposal

c) Developing Sewerage Treatment Systems

[Solution Description] The Namami Gange Programme focuses on reducing pollution in the Ganga River through various measures, including improving waste management practices. Developing sewerage treatment systems efficiently reduces pollution by treating urban waste before it enters rivers. This systematic approach addresses both solid waste and sewage, preventing untreated waste discharge into waterways.

Key Concept: Pollution Types

d) Noise pollution

[Solution Description] The use of loud machinery in industrial settings leads to noise pollution, which disrupts the natural sound environment and can have adverse effects on human health and wildlife.

Key Concept: Measurement Unit

c) Decibels (dB)

[Solution Description] Noise levels are typically measured in decibels (dB). This unit is used to quantify sound levels based on their intensity.

Key Concept: Waste Impact

c) Spread of waterborne diseases

[Solution Description] Improper disposal of industrial solid waste can lead to various health problems in urban areas. These wastes can introduce hazardous pollutants into the environment, which may contaminate water sources and result in diseases such as typhoid, cholera, and diarrhoea. Industrial waste often contains toxic chemicals that, when released into soil and water bodies, can severely impact human health by making local water supplies unsafe for drinking.

Key Concept: Cultural Activities

d) Pilgrimage

[Solution Description]

Pilgrimage activities often involve large gatherings along riverbanks, generating significant amounts of domestic waste, including organic materials, plastics, and other non-biodegradable waste leading to water pollution.

Key Concept: Impact Evaluation

d) Increased dropout rates

[Solution Description] Poor sanitation in urban slums often leads to the spread of diseases such as diarrhoea and cholera, causing children to miss school due to illness, thereby increasing dropout rates.

Key Concept: Advanced Cause and Effect, Long-term Consequences

b) Nitrogen oxides react with hydrocarbons under sunlight to create ground-level ozone, leading to smog.

[Solution Description]

Urban smog is primarily formed through a complex photochemical reaction involving nitrogen oxides (NO$$_x$$) and volatile organic compounds (VOCs) emitted from vehicles. These pollutants react in the presence of sunlight to form ground-level ozone (O$$_3$$), which is a major component of urban smog.

Step 1: Vehicles emit NO$$_x$$ and VOCs as they burn fossil fuels.

Step 2: In the presence of sunlight, these pollutants undergo photochemical reactions.

Step 3: Ground-level ozone is produced, contributing to urban smog.

This chain of reactions results in diminished air quality and visibility, characteristic of urban smog.

Key Concept: Technological Impact

c) Increased machinery and vehicle usage

[Solution Description] Technological innovations like machinery, vehicles, and electronic devices have increased the number of noise sources, contributing to higher levels of noise pollution in modern life.

Key Concept: Advanced Chemical Analysis, Long-term Effects

a) $$SO_2 + H_2O \rightarrow H_2SO_3$$; $$2NO_2 + H_2O \rightarrow HNO_3 + HNO_2$$

[Solution Description] The burning of fossil fuels releases sulfur dioxide ($$SO_2$$) and nitrogen oxides ($$NO_x$$), both of which can lead to the formation of acids when combined with water vapor in the atmosphere. These acids include sulfurous acid ($$H_2SO_3$$) and nitric acid ($$HNO_3$$). Additionally, $$CO$$ (carbon monoxide) can cause respiratory problems. Therefore, the reactions contributing significantly to environmental and health issues would be:

1. $$SO_2 + H_2O \rightarrow H_2SO_3$$

2. $$2NO_2 + H_2O \rightarrow HNO_3 + HNO_2$$

Both these reactions result in acids that contribute to acid rain and have potential health effects.

Key Concept: Resource Degradation

c) It reduces agricultural productivity causing increased poverty.

[Solution Description] Resource degradation in Jhabua district leads to a decline in agricultural productivity due to soil erosion and deforestation. This results in lower income for farmers, which increases poverty levels as they rely heavily on agriculture for their livelihood.