Geography - Land, Soil, Water, Natural Vegetation and Wildlife Resources – CBSE NCERT Study Resources

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Geography - Land, Soil, Water, Natural Vegetation and Wildlife Resources

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8th

8th - Social Studies

Geography - Land, Soil, Water, Natural Vegetation and Wildlife Resources

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Overview of the Chapter

This chapter explores the significance of land, soil, water, natural vegetation, and wildlife as vital natural resources. It discusses their distribution, utilization, conservation, and the challenges faced in managing these resources sustainably.

Land Resources

Land is a finite resource essential for human activities like agriculture, housing, and industry. The chapter explains land use patterns, factors affecting land use, and the need for land conservation.

Land use refers to the way humans utilize land for various purposes, influenced by physical and human factors.

Soil Resources

Soil is a crucial natural resource formed by weathering of rocks and organic matter. The chapter covers soil types, soil erosion, and methods to prevent degradation.

Soil erosion is the removal of the topsoil layer by natural forces like wind and water, often accelerated by human activities.

Water Resources

Water is indispensable for life and economic activities. The chapter discusses freshwater availability, water scarcity, and sustainable water management practices.

Water scarcity occurs when the demand for water exceeds the available supply or when poor quality restricts its use.

Natural Vegetation

Natural vegetation varies based on climate and soil conditions. The chapter highlights different vegetation types, their ecological importance, and threats like deforestation.

Natural vegetation refers to plant communities that grow naturally without human intervention.

Wildlife Resources

Wildlife plays a key role in maintaining ecological balance. The chapter addresses wildlife conservation efforts and the impact of human activities on biodiversity.

Wildlife includes all non-domesticated animals, plants, and other organisms living in their natural habitats.

Conservation of Resources

The chapter concludes with strategies for conserving natural resources, emphasizing sustainable practices and community participation.

All Question Types with Solutions – CBSE Exam Pattern

Explore a complete set of CBSE-style questions with detailed solutions, categorized by marks and question types. Ideal for exam preparation, revision and practice.

Very Short Answer (1 Mark) – with Solutions (CBSE Pattern)

These are 1-mark questions requiring direct, concise answers. Ideal for quick recall and concept clarity.

Question 1:
Define land use.
Answer:

Using land for different purposes like agriculture or housing.

Question 2:
Name one method of soil conservation.
Answer:

Terrace farming.

Question 3:
What is the main source of freshwater?
Answer:

Rainwater.

Question 4:
Give an example of natural vegetation in India.
Answer:

Tropical rainforests.

Question 5:
Why is wildlife important?
Answer:

Maintains ecological balance.

Question 6:
Name one threat to land resources.
Answer:

Deforestation.

Question 7:
What is afforestation?
Answer:

Planting trees in barren areas.

Question 8:
Which factor affects soil formation?
Answer:

Climate.

Question 9:
Name one water conservation technique.
Answer:

Rainwater harvesting.

Question 10:
What is biosphere reserve?
Answer:

Protected area for wildlife.

Question 11:
Name one endangered species in India.
Answer:

Bengal tiger.

Question 12:
What causes soil erosion?
Answer:

Heavy rainfall.

Question 13:
Name one national park in India.
Answer:

Jim Corbett National Park.

Question 14:
Why is groundwater important?
Answer:

Used for drinking and irrigation.

Question 15:
Define natural vegetation.
Answer:

Natural vegetation refers to plant communities that grow naturally without human intervention. These include forests, grasslands, and shrubs, which adapt to the local climate and soil conditions.

Question 16:
Name any two factors that influence soil formation.
Answer:

Two factors influencing soil formation are:
1. Climate (temperature and rainfall)
2. Parent rock (the original material from which soil is formed).

Question 17:
What is water scarcity?
Answer:

Water scarcity occurs when the demand for water exceeds the available supply or when poor quality restricts its use. It can result from overuse, pollution, or unequal distribution.

Question 18:
Why is wildlife conservation important?
Answer:

Wildlife conservation is crucial because:
1. Maintains ecological balance
2. Preserves biodiversity
3. Supports livelihoods (e.g., tourism, medicine).

Question 19:
List two methods of soil conservation.
Answer:

Two methods of soil conservation are:
1. Contour ploughing (ploughing along the contours to reduce erosion)
2. Afforestation (planting trees to hold soil).

Question 20:
What are biosphere reserves?
Answer:

Biosphere reserves are protected areas where ecosystems, biodiversity, and cultural heritage are conserved. They promote sustainable development and research.

Question 21:
How does deforestation affect wildlife?
Answer:

Deforestation destroys habitats, leading to:
1. Loss of biodiversity
2. Disruption of food chains
3. Endangered species.

Question 22:
Name two freshwater sources.
Answer:

Two freshwater sources are:
1. Rivers
2. Groundwater (water stored underground).

Question 23:
What is land degradation?
Answer:

Land degradation is the decline in land quality caused by human activities like deforestation, overgrazing, or improper farming, reducing its productivity.

Question 24:
Why are national parks established?
Answer:

National parks are established to:
1. Protect endangered species
2. Preserve natural landscapes
3. Promote eco-tourism.

Question 25:
How does over-irrigation harm soil?
Answer:

Over-irrigation leads to:
1. Waterlogging (excess water in soil)
2. Salinization (salt buildup), reducing fertility.

Question 26:
What is the role of humus in soil?
Answer:

Humus enriches soil by:
1. Improving fertility
2. Retaining moisture
3. Supporting microorganisms.

Very Short Answer (2 Marks) – with Solutions (CBSE Pattern)

These 2-mark questions test key concepts in a brief format. Answers are expected to be accurate and slightly descriptive.

Question 1:
Define natural vegetation and name any two types found in India.
Answer:

Natural vegetation refers to plant communities that grow naturally without human intervention.
Two types found in India are: Tropical Evergreen Forests (Western Ghats, Andaman Islands) and Thorn Forests (Rajasthan, Gujarat).

Question 2:
Why is soil conservation important? Mention one method to achieve it.
Answer:

Soil conservation prevents erosion and maintains fertility for agriculture.
One method is contour ploughing, where ploughing follows the natural contours of the land to reduce water runoff.

Question 3:
How does afforestation help in maintaining groundwater levels?
Answer:

Afforestation increases tree cover, which enhances water infiltration into the ground.
Tree roots hold soil, reducing runoff and allowing rainwater to recharge aquifers.

Question 4:
List two human activities that threaten wildlife.
Answer:
  • Deforestation destroys habitats.
  • Poaching illegally kills animals for trade.
Question 5:
What is land degradation? Give one cause.
Answer:

Land degradation is the decline in land quality due to human activities.
One cause is overgrazing, which removes vegetation cover, leading to soil erosion.

Question 6:
Name two states in India where black soil is predominantly found.
Answer:

Black soil is rich in clay and ideal for cotton.
Found mainly in Maharashtra and Madhya Pradesh.

Question 7:
How does terrace farming prevent soil erosion?
Answer:

Terrace farming creates steps on slopes, reducing water flow velocity.
This minimizes soil loss and retains nutrients, common in hilly regions like the Himalayas.

Question 8:
Differentiate between renewable and non-renewable resources with examples.
Answer:
  • Renewable: Replenished naturally (e.g., solar energy, wind).
  • Non-renewable: Finite supply (e.g., coal, petroleum).
Question 9:
Why are wetlands ecologically significant?
Answer:

Wetlands act as natural water filters, support biodiversity, and control floods.
Examples include Sundarbans and Keoladeo National Park.

Question 10:
What role do national parks play in wildlife protection?
Answer:

National parks preserve ecosystems, prohibit human interference, and safeguard endangered species.
Example: Kaziranga National Park protects one-horned rhinos.

Question 11:
Explain the term water scarcity and one reason for its occurrence.
Answer:

Water scarcity is the lack of sufficient freshwater resources.
One reason is overuse in agriculture, which depletes groundwater.

Short Answer (3 Marks) – with Solutions (CBSE Pattern)

These 3-mark questions require brief explanations and help assess understanding and application of concepts.

Question 1:
Explain the importance of soil conservation and list two methods to achieve it.
Answer:

Soil conservation is crucial to maintain soil fertility, prevent erosion, and ensure sustainable agriculture. Without it, topsoil loss can lead to desertification and reduced crop yields.

  • Contour Ploughing: Ploughing along the natural contours of the land reduces water flow and soil erosion.
  • Afforestation: Planting trees helps bind the soil and prevents wind or water erosion.
Question 2:
How does natural vegetation help in maintaining ecological balance? Provide two examples.
Answer:

Natural vegetation plays a key role in ecological balance by:

  • Oxygen Production: Plants release oxygen during photosynthesis, essential for all living beings.
  • Habitat Provision: Forests provide shelter to wildlife, maintaining biodiversity.

For example, tropical rainforests regulate global climate, while grasslands support herbivores like deer.

Question 3:
Describe the causes and effects of water scarcity in any two regions of India.
Answer:

Causes of water scarcity:
1. Overuse of groundwater for agriculture in Punjab.
2. Pollution of rivers like the Ganga due to industrial waste.

Effects:
1. Punjab faces falling water tables, making farming difficult.
2. In West Bengal, contaminated water leads to health issues like cholera.

Question 4:
What are the differences between renewable and non-renewable resources? Give one example of each.
Answer:

Renewable resources can be replenished naturally, like solar energy.
Non-renewable resources are finite, such as coal.

Key differences:
1. Availability: Renewable resources are sustainable; non-renewable deplete over time.
2. Environmental Impact: Non-renewables cause pollution, while renewables are cleaner.

Question 5:
How do human activities impact wildlife? Suggest two measures to protect endangered species.
Answer:

Human impacts on wildlife:
1. Deforestation destroys habitats.
2. Poaching threatens species like tigers.

Protection measures:

  • Wildlife Sanctuaries: Safe zones for animals to thrive.
  • Awareness Campaigns: Educate communities on conservation.

Question 6:
Explain the term land degradation and mention two ways to restore degraded land.
Answer:

Land degradation refers to the decline in land quality due to factors like deforestation or overgrazing.

Restoration methods:
1. Terrace Farming: Reduces soil erosion on slopes.
2. Crop Rotation: Maintains soil nutrients and prevents exhaustion.

Question 7:
How does natural vegetation vary with changes in altitude? Provide an example.
Answer:

As altitude increases, natural vegetation changes due to temperature and oxygen variations.

Example:

  • In the Himalayas, tropical forests (foothills) transition to coniferous forests (mid-altitude) and finally to alpine meadows (high altitude).
This zonation supports diverse wildlife adapted to each layer.

Question 8:
Describe the role of water as a natural resource and its unequal distribution globally.
Answer:

Water is vital for survival, agriculture, and industries.

Unequal distribution occurs due to:

  • Climate: Arid regions (e.g., Sahara) lack water compared to tropical areas.
  • Human activities: Overuse and pollution reduce accessibility.
Solutions like rainwater harvesting and drip irrigation can mitigate scarcity.

Question 9:
What are the causes of land degradation? Suggest one measure to restore degraded land.
Answer:

Causes of land degradation include:

  • Deforestation: Removes protective vegetation cover.
  • Overgrazing: Exhausts soil nutrients.

Restoration measure: Organic farming replenishes soil fertility without chemicals, promoting sustainable land use.

Question 10:
Why is wildlife conservation important? Name two protected species in India.
Answer:

Wildlife conservation maintains ecological balance and preserves biodiversity.

Protected species in India:

  • Bengal Tiger (National animal)
  • Indian Rhinoceros (Kaziranga National Park)
Conservation efforts include wildlife sanctuaries and anti-poaching laws.

Long Answer (5 Marks) – with Solutions (CBSE Pattern)

These 5-mark questions are descriptive and require detailed, structured answers with proper explanation and examples.

Question 1:
Explain the importance of soil conservation with examples of methods used in India.
Answer:
Historical Context

Soil conservation is vital to prevent erosion and maintain fertility. Our textbook shows how ancient civilizations like the Indus Valley used terracing.

Key Developments
  • Contour ploughing in hilly areas like Himachal Pradesh.
  • Afforestation projects like Van Mahotsav.
  • Building check dams in Rajasthan under Watershed Development.
Current Relevance

Today, soil health cards help farmers monitor nutrients. Unscientific farming still degrades land, making conservation urgent.

Question 2:
How does water scarcity affect human life? Discuss with Indian examples.
Answer:
Historical Context

Water scarcity disrupts agriculture and health. Our textbook mentions droughts in Maharashtra (2013).

Key Developments
  • Chennai’s 2019 crisis forced tanker dependence.
  • Farmers in Punjab overusing tubewells deplete groundwater.
  • Jal Shakti Abhiyan promotes rainwater harvesting.
Socio-economic Impact

Women walk miles for water in Rajasthan. Conflicts arise between states like Karnataka-Tamil Nadu over Cauvery.

Question 3:
Describe the distribution of natural vegetation in India and its economic significance.
Answer:
Historical Context

India has diverse vegetation due to varied climate. Our textbook maps show tropical forests in Kerala and mangroves in Sundarbans.

Key Developments
  • Teak from Madhya Pradesh for furniture.
  • Medicinal plants like neem from Rajasthan.
  • Bamboo in Northeast for paper industry.
Current Relevance

Deforestation for urbanization threatens biodiversity. Projects like Green India Mission aim to restore forests.

Question 4:
Analyze the threats to wildlife resources and conservation efforts in India.
Answer:
Historical Context

Wildlife faces habitat loss and poaching. Our textbook mentions Project Tiger (1973) to save Bengal tigers.

Key Developments
  • Kaziranga National Park protects one-horned rhinos.
  • Illegal hunting of snow leopards in Himalayas.
  • Community reserves like Bishnoi villages in Rajasthan.
Socio-economic Impact

Eco-tourism boosts income but pollution harms species. Awareness campaigns like Save the Sparrow help.

Question 5:
Compare land use patterns in rural and urban areas with examples.
Answer:
Historical Context

Land use varies by needs. Our textbook contrasts Punjab’s farms with Mumbai’s skyscrapers.

Key Developments
  • Rural: 60% land for agriculture (e.g., wheat in Haryana).
  • Urban: Commercial hubs like Bengaluru’s IT parks.
  • Wasteland reclamation in Gujarat’s Suramin project.
Current Relevance

Smart cities reduce pressure on rural land. However, urban sprawl destroys fertile fields.

Question 6:
Explain the importance of soil conservation with examples of methods taught in our textbook.
Answer:
Historical Context

Soil is vital for agriculture, but erosion degrades it. Our textbook shows how ancient civilizations like the Indus Valley used terracing.

Key Developments
  • Contour ploughing: Farmers in hilly areas like Himachal Pradesh plough across slopes.
  • Shelterbelts: Rows of trees in Rajasthan reduce wind erosion.
  • Crop rotation: Punjab farmers alternate wheat with legumes to retain nutrients.
Current Relevance

Today, urban sprawl threatens soil. Projects like ‘Soil Health Cards’ promote awareness.

Question 7:
How does water scarcity affect natural vegetation? Use NCERT examples.
Answer:
Historical Context

Water scarcity disrupts ecosystems. Our textbook mentions the Thar Desert, where low rainfall limits vegetation.

Key Developments
  • Deforestation: In Rajasthan, fewer trees grow due to droughts.
  • Reduced biodiversity: The Sundarbans face mangrove loss as freshwater flow decreases.
  • Adaptation: Cacti in Gujarat store water to survive.
Current Relevance

Chennai’s 2019 water crisis highlighted how urban demand harms green cover. Conservation is urgent.

Question 8:
Describe how human activities threaten wildlife resources. Give three examples.
Answer:
Historical Context

Humans have hunted animals like cheetahs to extinction, as studied in our textbook.

Key Developments
  • Poaching: Tigers in Sundarbans are killed for skin.
  • Habitat loss: Delhi’s expansion destroyed sparrow nests.
  • Pollution: Ganga’s dolphins suffer from industrial waste.
Current Relevance

Projects like ‘Project Elephant’ protect species, but urban growth remains a challenge.

Question 9:
Compare renewable and non-renewable resources with NCERT examples.
Answer:
Historical Context

Our textbook explains how coal (non-renewable) fueled the Industrial Revolution, while windmills (renewable) have been used for centuries.

Key Developments
  • Renewable: Solar plants in Gujarat harness sunlight.
  • Non-renewable: Jharia coal mines are depleting.
  • Sustainability: Kerala uses biogas from waste.
Current Relevance

India’s solar mission promotes renewables, but coal still dominates energy needs.

Question 10:
Analyze the role of natural vegetation in maintaining ecological balance.
Answer:
Historical Context

Forests like the Amazon act as ‘lungs of the Earth.’ Our textbook mentions how the Western Ghats regulate rainfall.

Key Developments
  • Oxygen production: Mangroves in Odisha absorb CO2.
  • Soil protection: Himalayan forests prevent landslides.
  • Wildlife support: Kaziranga’s grasses feed rhinos.
Current Relevance

Deforestation for cities like Mumbai harms air quality. Afforestation drives are critical.

Question 11:
Explain the importance of soil conservation and discuss any three methods to prevent soil erosion. Support your answer with examples.
Answer:

Soil conservation is crucial because soil is a vital natural resource that supports plant growth, agriculture, and ecosystems. Without healthy soil, food production would decline, leading to food shortages and economic problems. Soil erosion, caused by factors like deforestation, overgrazing, and improper farming, degrades soil quality.

Three effective methods to prevent soil erosion are:

  • Contour Ploughing: Ploughing along the natural contours of the land slows water flow, reducing soil loss. Example: Farmers in hilly regions like Himachal Pradesh use this method.
  • Terrace Farming: Creating flat steps on slopes prevents water from washing away soil. Example: Rice cultivation in the Himalayas uses terraces.
  • Afforestation: Planting trees stabilizes soil with roots and reduces wind erosion. Example: The Van Mahotsav initiative promotes tree planting across India.

By adopting these methods, we can protect soil for future generations and maintain ecological balance.

Question 12:
Describe the distribution of water resources in India and explain any two challenges related to water scarcity. Suggest one solution for each challenge.
Answer:

India's water resources are unevenly distributed due to variations in rainfall, geography, and population density. Regions like the Brahmaputra basin have abundant water, while states like Rajasthan face scarcity. Rivers, lakes, and groundwater are primary sources, but overuse and pollution threaten their sustainability.

Two major challenges of water scarcity are:

  • Over-extraction of Groundwater: Excessive use for agriculture depletes underground reserves, leading to falling water tables.
    Solution: Promote drip irrigation to reduce water wastage in farming.
  • Pollution of Water Bodies: Industrial waste and sewage contaminate rivers, making water unsafe.
    Solution: Implement stricter laws like the Water (Prevention and Control of Pollution) Act to regulate waste disposal.

Addressing these challenges ensures sustainable water availability for drinking, agriculture, and industries.

Question 13:
Explain the importance of soil conservation and describe any three methods to prevent soil erosion.
Answer:

Soil conservation is crucial because soil is a vital natural resource that supports plant growth, agriculture, and ecosystems. Without healthy soil, food production would decline, leading to food shortages and environmental degradation. Soil erosion, caused by factors like deforestation, overgrazing, and improper farming, can lead to loss of fertile topsoil, reduced agricultural productivity, and increased pollution in water bodies.

Three effective methods to prevent soil erosion are:

  • Afforestation: Planting trees helps bind the soil with roots, reducing the impact of wind and water erosion.
  • Contour Ploughing: Ploughing along the natural contours of the land slows water flow, preventing soil from being washed away.
  • Terrace Farming: Creating steps or terraces on slopes reduces water runoff and soil loss, commonly used in hilly areas.

Additionally, practices like crop rotation and using organic manure improve soil fertility and structure, further aiding conservation efforts.

Question 14:
Describe the distribution of water resources in India and discuss two major challenges related to water availability.
Answer:

India's water resources are unevenly distributed due to variations in rainfall, geography, and population density. Regions like the Brahmaputra valley and Western Ghats receive abundant rainfall, while areas like Rajasthan and parts of Gujarat face water scarcity. Rivers, lakes, groundwater, and glaciers are the primary sources, but their availability varies seasonally.

Two major challenges related to water availability are:

  • Overexploitation of Groundwater: Excessive use for agriculture and industries has led to declining water tables, especially in Punjab and Haryana.
  • Pollution of Water Bodies: Industrial waste, sewage, and agricultural runoff contaminate rivers and lakes, making water unsafe for consumption.

To address these issues, rainwater harvesting, watershed management, and stricter pollution control measures are essential.

Question 15:
Explain the importance of soil conservation and discuss any three methods to prevent soil erosion. Support your answer with relevant examples.
Answer:

Soil conservation is crucial because soil is a vital natural resource that supports plant growth, agriculture, and ecosystems. Without healthy soil, food production would decline, leading to food shortages and environmental degradation. Soil erosion, caused by factors like deforestation, overgrazing, and improper farming, can deplete fertile topsoil, reducing land productivity.

Three effective methods to prevent soil erosion are:

  • Contour Ploughing: Ploughing along the natural contours of the land slows water flow, reducing soil washout. Example: Farmers in hilly regions like Himachal Pradesh use this method.
  • Afforestation: Planting trees helps bind soil with roots and reduces wind/water erosion. Example: The Van Mahotsav initiative promotes tree planting.
  • Terrace Farming: Creating steps on slopes prevents soil from being washed away. Example: Rice cultivation in the Himalayan foothills uses terraces.

These methods ensure sustainable land use and protect biodiversity, making soil conservation essential for future generations.

Question 16:
Describe the distribution of water resources in India and analyze the challenges faced in their management. Suggest two measures to improve water conservation.
Answer:

India's water resources are unevenly distributed due to varying rainfall patterns and geographical features. While regions like the Brahmaputra basin have abundant water, areas like Rajasthan face scarcity. Rivers, lakes, and groundwater are primary sources, but overuse and pollution threaten their sustainability.

Challenges in water management include:

  • Over-extraction of groundwater: Excessive use for agriculture depletes aquifers, leading to falling water tables.
  • Pollution: Industrial waste and sewage contaminate rivers like the Ganga, harming ecosystems.
  • Unequal access: Rural areas often lack proper infrastructure, causing water shortages.

Two measures to improve conservation are:

  • Rainwater Harvesting: Collecting rainwater in tanks or recharging groundwater helps combat scarcity. Example: Tamil Nadu mandates rooftop harvesting.
  • Watershed Management: Restoring ponds and check dams in villages conserves water. Example: The Neeru-Meeru program in Andhra Pradesh.

Efficient water management ensures equitable distribution and sustains life and agriculture.

Question 17:
Describe the distribution of water resources in India and discuss the challenges in their management.
Answer:

India's water resources are unevenly distributed due to variations in rainfall, geography, and population density. The major sources include rivers, lakes, groundwater, and glaciers. The Himalayan rivers like the Ganga and Brahmaputra are perennial, while peninsular rivers like the Godavari and Krishna are rain-fed and seasonal.

Challenges in water resource management include:

  • Overexploitation: Excessive use of groundwater for agriculture and industries has led to depletion of aquifers.
  • Pollution: Industrial waste, sewage, and agricultural runoff contaminate water bodies, making them unfit for use.
  • Unequal Access: Some regions face water scarcity due to low rainfall, while others suffer from floods, highlighting poor distribution.

To address these issues, measures like rainwater harvesting, watershed management, and stricter pollution control laws are essential. Public awareness about water conservation can also play a significant role in sustainable management.

Question 18:
Explain the importance of soil conservation and describe any three methods to prevent soil erosion. Support your answer with examples.
Answer:

Soil conservation is crucial because soil is a vital natural resource that supports plant growth, agriculture, and ecosystems. Without healthy soil, food production would decline, leading to food insecurity. Soil also acts as a natural filter for water and stores carbon, helping combat climate change.

Here are three methods to prevent soil erosion:

  • Contour Ploughing: Ploughing along the natural contours of the land slows water flow, reducing soil loss. Example: Farmers in hilly regions use this method to retain soil fertility.
  • Afforestation: Planting trees stabilizes soil with roots and reduces wind erosion. Example: The Green Belt Movement in Africa has successfully combated desertification.
  • Terrace Farming: Creating flat steps on slopes prevents water from washing away soil. Example: Rice terraces in the Philippines have been used for centuries.

By adopting these methods, we can ensure sustainable land use and protect our environment for future generations.

Question 19:
Discuss the significance of water as a resource and explain how human activities are leading to its depletion. Suggest two measures to conserve water resources.
Answer:

Water is essential for all forms of life, agriculture, industries, and daily activities. It sustains ecosystems, regulates climate, and is a key component in economic development. However, human activities are depleting water resources rapidly.

Major causes of water depletion include:

  • Overuse in Agriculture: Excessive irrigation with inefficient methods like flood irrigation wastes water. Example: Punjab's groundwater levels are dropping due to over-extraction for wheat and rice farming.
  • Pollution: Industrial waste and untreated sewage contaminate freshwater sources. Example: The Ganga River faces severe pollution from industrial discharge.

Two conservation measures are:

  • Rainwater Harvesting: Collecting rainwater for reuse reduces dependency on groundwater. Example: Tamil Nadu has made rooftop rainwater harvesting mandatory.
  • Drip Irrigation: Delivering water directly to plant roots minimizes wastage. Example: Israeli farmers use this method in arid regions.

Conserving water ensures its availability for future needs and maintains ecological balance.

Case-based Questions (4 Marks) – with Solutions (CBSE Pattern)

These 4-mark case-based questions assess analytical skills through real-life scenarios. Answers must be based on the case study provided.

Question 1:
Case: A farmer in Punjab noticed soil degradation due to excessive use of chemical fertilizers.
Case Context: Our textbook shows how land resources are affected by human activities.
Q1. Explain two causes of soil degradation in Punjab and suggest two sustainable farming methods.
Answer:

Historical/Geographical Analysis: Punjab's fertile soil is degrading due to:

  • Overuse of chemical fertilizers reducing soil fertility.
  • Excessive irrigation causing waterlogging.
Current Relevance: Sustainable methods include:
  • Crop rotation (like wheat-mustard) to restore nutrients.
  • Using organic manure as shown in NCERT's Sikkim example.
Question 2:
Case: Rajasthan faces water scarcity due to erratic rainfall.
Case Context: We studied water conservation methods in Chapter 2.
Q2. Compare traditional (khadins) and modern (drip irrigation) water management techniques with examples.
Answer:

Historical/Geographical Analysis:

  • Khadins: Ancient Rajasthan's rainwater harvesting system (e.g., Jaisalmer).
  • Drip irrigation: Modern Israel-inspired method saves water (NCERT example).
Current Relevance: Khadin revived in Alwar district; drip used in Maharashtra's grape farms.
Question 3:
Case: The Sundarbans' mangrove forests are shrinking.
Case Context: NCERT highlights biodiversity threats.
Q3. Identify two reasons for mangrove loss and two wildlife species affected (with examples).
Answer:

Historical/Geographical Analysis:

  • Rising sea levels submerge forests (e.g., Cyclone Amphan).
  • Illegal logging for settlements.
Current Relevance: Endangered species:
  • Royal Bengal Tiger (only 100 left).
  • Olive Ridley turtles losing nesting sites.
Question 4:
Case: Kerala's laterite soil is ideal for cashew cultivation.
Case Context: We learned about soil types and crops.
Q4. Describe two characteristics of laterite soil and link them to Kerala's agriculture with examples.
Answer:

Historical/Geographical Analysis: Laterite soil:

  • Rich in iron oxide (red color).
  • Low fertility but good for plantation crops.
Current Relevance: Kerala grows:
  • Cashew (Kollam district).
  • Tea (Munnar) with organic supplements.
Question 5:
Case: A farmer in Punjab noticed his soil fertility declining despite using fertilizers. Land degradation is visible. Analyze causes and suggest sustainable practices.
Answer:
Case Context

Punjab's fertile soil is losing productivity due to overuse of chemicals and monocropping.

Historical/Geographical Analysis
  • Our textbook shows waterlogging from excessive irrigation.
  • Soil erosion due to deforestation in Shiwaliks.
  • Example: Rajasthan's arid soils worsened by overgrazing.
Current Relevance

Solutions: Crop rotation (like pulses), organic manure, and contour ploughing as seen in Kerala's farms.

Question 6:
Case: Chennai faced water scarcity in 2019 despite coastal location. Examine geographical factors and water conservation methods.
Answer:
Case Context

Chennai's reservoirs dried up due to failed monsoons and urban sprawl.

Historical/Geographical Analysis
  • Our textbook mentions rainwater harvesting in Rajasthan's johads.
  • Example: Bengaluru's lake revival project.
  • Groundwater depletion from unchecked borewells.
Current Relevance

Solutions: Rooftop harvesting (like in Tamil Nadu schools) and watershed management.

Question 7:
Case: Deforestation in Amazon increased wildfires. Compare impacts on natural vegetation and wildlife in India (e.g., Sundarbans).
Answer:
Case Context

Forest fires destroy habitats and increase CO₂ levels globally.

Historical/Geographical Analysis
  • Sundarbans' mangroves protect against cyclones but face logging.
  • Example: Gir Forest lions losing corridors.
  • Our textbook shows biosphere reserves like Nilgiris.
Current Relevance

Solutions: Community forests (like Bishnois) and stricter wildlife protection laws.

Question 8:
Case: Ladakh's glaciers are melting, affecting water resources. Identify Himalayan challenges and sustainable tourism measures.
Answer:
Case Context

Glacial melt reduces freshwater supply to Indus tributaries.

Historical/Geographical Analysis
  • Example: Gangotri Glacier retreating 30m/year.
  • Our textbook mentions spring rejuvenation in Sikkim.
  • Tourist waste polluting Pangong Lake.
Current Relevance

Solutions: Homestays (like Spiti Valley) and solar energy use in villages.

Question 9:
Case: The Sundarbans face biodiversity loss due to rising sea levels.
Case Context: Our chapter highlights threats to natural vegetation.
Q2. Identify two reasons for wildlife depletion in Sundarbans and propose two conservation measures.
Answer:

Historical/Geographical Analysis: Threats include:

  • Climate change (rising seas)
  • Illegal poaching of tigers
Current Relevance: Conservation ideas:
  • Creating protected areas (like Project Tiger)
  • Community awareness programs
We learned how similar measures saved Gir lions and Kaziranga rhinos.

Question 10:
Case: Rajasthan's water scarcity worsened in 2023.
Case Context: Our textbook discusses water resources management.
Q3. Describe two geographical factors causing Rajasthan's water crisis and two traditional water-saving techniques used there.
Answer:

Historical/Geographical Analysis: Causes:

  • Low rainfall (Thar Desert)
  • High evaporation rates
Current Relevance: Traditional methods:
  • Stepwells (like Chand Baori)
  • Khadin farming (water harvesting)
We studied how Tamil Nadu's rainwater harvesting also solves scarcity.

Question 11:
Case: Deforestation in Amazon increased in 2024.
Case Context: Our chapter links forests to climate regulation.
Q4. State two global impacts of Amazon's deforestation and two ways students can help conserve forests.
Answer:

Historical/Geographical Analysis: Impacts:

  • Increased carbon dioxide
  • Loss of medicinal plants
Current Relevance: Student actions:
  • Planting trees (like CBSE's green drive)
  • Recycling paper
We saw similar success in Chipko Movement and Van Mahotsav.

Question 12:

Rahul visited a village where he observed that farmers were practicing terrace farming on hilly slopes. However, during heavy rains, soil erosion was still occurring in some areas. Based on this case:

  • Identify the natural factor and human factor contributing to soil erosion here.
  • Suggest two measures the farmers can adopt to further reduce soil erosion.
Answer:

Natural factor: Heavy rainfall loosens the topsoil and washes it away, especially on slopes.
Human factor: Improper terrace design or lack of vegetation cover on terraces can accelerate erosion.

Measures to reduce soil erosion:

  • Planting cover crops like grasses or legumes between crops to hold the soil.
  • Constructing contour trenches or small barriers to slow water flow and trap soil.

These methods enhance soil stability and conserve water, making farming sustainable.

Question 13:

A wildlife sanctuary in Rajasthan is facing a decline in the population of Great Indian Bustard due to habitat loss. Analyze the case and answer:

  • Name two human activities that could be causing habitat destruction here.
  • Propose one government initiative and one community action to protect this species.
Answer:

Human activities causing habitat loss:

  • Expansion of agricultural land encroaching on sanctuary areas.
  • Construction of windmills or power lines, which disrupt the bird's flight paths.

Conservation measures:

  • Government initiative: Implementing stricter Protected Area regulations and patrolling to prevent illegal activities.
  • Community action: Creating awareness programs for locals to promote eco-tourism as an alternative livelihood, reducing dependency on land use.

Such steps ensure the survival of endangered species while balancing human needs.

Question 14:

Rahul's village is facing severe soil erosion due to heavy rainfall and deforestation. The villagers are worried about losing their fertile land. Based on this case:

  • Identify two natural and two human-induced causes of soil erosion in Rahul's village.
  • Suggest two conservation methods the villagers can adopt to prevent further soil degradation.
Answer:

Natural causes:
1. Heavy rainfall washes away the topsoil, especially on slopes.
2. Wind can blow away loose soil in dry areas.

Human-induced causes:
1. Deforestation removes tree roots that hold soil together.
2. Overgrazing by animals reduces grass cover, exposing soil to erosion.

Conservation methods:
1. Afforestation: Planting trees to bind the soil with roots.
2. Contour ploughing: Ploughing along the natural contours of the land to slow water flow and reduce erosion.

Additionally, constructing terrace farms on slopes and using mulching (covering soil with organic matter) can further protect the soil.

Question 15:

A wildlife sanctuary in Rajasthan is experiencing a decline in its blackbuck population due to habitat loss and poaching. Answer the following:

  • Explain two reasons why wildlife conservation is important for ecosystems.
  • Propose two sustainable measures the sanctuary authorities can take to protect the blackbucks.
Answer:

Importance of wildlife conservation:
1. Biodiversity maintenance: Every species, like the blackbuck, plays a unique role in the food chain. Their loss can disrupt the entire ecosystem.
2. Ecological balance: Wildlife helps in seed dispersal, pollination, and maintaining healthy forests, which are vital for clean air and water.

Sustainable measures:
1. Habitat restoration: Planting native grasses and shrubs to provide food and shelter for blackbucks.
2. Community involvement: Educating locals about the importance of blackbucks and offering alternative livelihoods to reduce poaching.

Additionally, setting up anti-poaching patrols and using technology like drones for monitoring can enhance protection efforts.

Question 16:
Rahul observed that the soil in his village is dark and retains moisture well, making it suitable for growing wheat. However, his cousin in another region complained about the soil being sandy and unsuitable for agriculture. Analyze the factors responsible for these differences in soil types and suggest one method to improve sandy soil for farming.
Answer:

The difference in soil types is primarily due to variations in parent rock material, climate, and topography. Rahul's village likely has alluvial soil, which is dark, fertile, and moisture-retentive due to its origin from river deposits. His cousin's region may have sandy soil, which lacks nutrients and water-holding capacity because it forms from weathered granite or sandstone.

To improve sandy soil for farming:

  • Organic matter addition: Mixing compost or manure enhances water retention and nutrient content.

Understanding soil types helps in selecting appropriate crops and conservation methods, ensuring sustainable agriculture.

Question 17:
A wildlife sanctuary in Rajasthan is facing a decline in the population of the Great Indian Bustard due to habitat destruction. Explain two human activities causing this destruction and propose two conservation measures to protect this endangered species.
Answer:

Human activities causing habitat destruction:

  • Agricultural expansion: Converting grasslands into farms reduces nesting grounds.
  • Infrastructure development: Roads and power lines fragment habitats and increase bird collisions.

Conservation measures:

  • Establish protected corridors to connect fragmented habitats.
  • Promote community awareness programs to reduce human interference.

Protecting the Great Indian Bustard ensures biodiversity balance and ecological health in Rajasthan's arid regions.

Question 18:
Rahul observed that the soil in his village is dark and sticky, ideal for growing cotton. However, excessive use of chemical fertilizers has degraded its quality. Based on this case, answer:
(a) Identify the type of soil described.
(b) Suggest two sustainable practices to restore soil fertility.
Answer:

(a) The soil described is black soil, also known as regur soil. It is rich in clay and has high moisture retention capacity, making it suitable for crops like cotton.

(b) Two sustainable practices to restore soil fertility are:

  • Crop rotation: Growing different crops in succession to maintain nutrient balance.
  • Organic farming: Using compost or manure instead of chemical fertilizers to improve soil health.
Additionally, planting cover crops like legumes can fix nitrogen in the soil naturally.

Question 19:
A wildlife sanctuary in Rajasthan faces water scarcity due to irregular rainfall and overuse of groundwater. Analyze the situation and answer:
(a) Name one traditional water conservation method suitable for this region.
(b) How can afforestation help in solving this issue?
Answer:

(a) A traditional water conservation method suitable for Rajasthan is johads (small earthen check dams). These structures capture rainwater and recharge groundwater.

(b) Afforestation helps in:

  • Improving water retention in the soil by reducing runoff.
  • Maintaining the water cycle through transpiration, which can increase rainfall.
Trees also prevent soil erosion and provide shade, reducing water evaporation from the ground.

Question 20:
Rahul visited a village where he noticed that the topsoil was being washed away due to heavy rains, leading to poor crop yields. The villagers were unaware of soil conservation methods. Based on this scenario, answer the following:
(i) Identify the process causing the loss of topsoil.
(ii) Suggest two measures the villagers can adopt to conserve soil.
Answer:

(i) The process causing the loss of topsoil is soil erosion, specifically due to water erosion caused by heavy rains. This removes the fertile upper layer of soil, reducing its productivity.

(ii) Two measures the villagers can adopt to conserve soil are:

  • Terrace Farming: Creating steps or terraces on slopes to slow down water flow and reduce soil erosion.
  • Afforestation: Planting trees and grasses to hold the soil together with their roots, preventing erosion.
Additionally, using contour ploughing (ploughing along the natural contours of the land) can also help retain soil and water.

Question 21:
A wildlife sanctuary in India is facing a decline in tiger population due to illegal hunting and habitat destruction. Answer the following:
(i) Name one act/law that protects wildlife in India.
(ii) Explain two reasons why conserving tigers is important for the ecosystem.
Answer:

(i) The Wildlife Protection Act, 1972 is a key law in India that safeguards wildlife, including tigers, by prohibiting hunting and protecting their habitats.

(ii) Conserving tigers is crucial for the ecosystem because:

  • Maintaining Biodiversity: Tigers are apex predators, and their presence ensures a balanced food chain, preventing overpopulation of herbivores.
  • Forest Health: Tigers help maintain healthy forests by controlling prey species, which in turn supports vegetation and other wildlife.
Additionally, tigers are a part of India's natural heritage, and their conservation promotes ecotourism, benefiting local communities.

Question 22:
Rahul's family owns a small farm in Punjab. Over the years, they noticed their soil becoming less fertile and crops yielding less. A local agricultural officer suggested practicing crop rotation and using organic manure. Explain how these methods can help improve soil fertility and prevent land degradation.
Answer:

Crop rotation and organic manure are sustainable agricultural practices that enhance soil fertility and prevent land degradation.

  • Crop rotation involves growing different crops in succession on the same land. This prevents depletion of specific nutrients, as different crops have varying nutrient requirements. For example, legumes like peas fix nitrogen in the soil, benefiting subsequent crops.
  • Organic manure, such as compost or cow dung, enriches the soil with essential nutrients and improves its structure. Unlike chemical fertilizers, it does not harm soil microorganisms, ensuring long-term fertility.

Together, these methods reduce soil erosion, maintain nutrient balance, and promote sustainable farming, preventing land degradation.

Question 23:
A wildlife sanctuary in Karnataka is facing threats due to illegal logging and poaching. As a concerned student, suggest measures to conserve natural vegetation and wildlife in the area. Also, explain the role of community participation in conservation efforts.
Answer:

To conserve natural vegetation and wildlife in the sanctuary, the following measures can be taken:

  • Strengthening patrols and surveillance to prevent illegal logging and poaching.
  • Creating awareness campaigns to educate locals about the importance of biodiversity.
  • Promoting afforestation to restore degraded areas.

The role of community participation is crucial:

  • Local communities can act as custodians of the sanctuary, reporting illegal activities.
  • They can participate in tree-planting drives and wildlife monitoring programs.
  • Eco-tourism initiatives led by communities can provide alternative livelihoods, reducing dependence on forest resources.

Community involvement ensures sustainable conservation and fosters a sense of responsibility towards nature.

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