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Life on Earth

NCERT Class 9 · Social Science Based on NCERT Class 9 Social Science textbook · Free CBSE study kit

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Chapter Notes

Overview
This chapter introduces the concept of biomes as large natural regions shaped by climate and physiography, and explores how terrestrial and aquatic biomes support distinct forms of life. It examines the deep interconnection between humans and other life forms, especially forest-dependent communities, and highlights the importance of biodiversity conservation. The one big idea: Earth's life-supporting regions are interconnected systems where physical geography, climate, and living organisms—including humans—depend on one another, making conservation a shared responsibility.
Key Concepts (25)
Biome
A biome is a large natural region of the world where certain types of plants and animals live under similar climatic conditions. The word 'biome' combines 'bio' (from Greek 'bios', meaning life) and '-ome' (a suffix denoting a group of a specific type of biological constituents).
e.g. The Thar Desert in Rajasthan is a hot desert biome where cacti, camels, lizards, and snakes are specially adapted to survive extreme heat and dryness.
Ecosystem
An ecosystem is like a neighbourhood within a biome, where plants, animals, and non-living things interact closely.
e.g. A pond within a grassland biome where fish, frogs, insects, water, and soil interact forms an ecosystem.
Terrestrial Biomes
Terrestrial biomes are land-based biomes classified into forests, grasslands, deserts, and tundra, based on their climate.
e.g. The Amazon Basin rainforest, the African Savanna, the Sahara Desert, and the Arctic tundra are all terrestrial biomes.
Aquatic Biomes
Aquatic biomes are water-based biomes that cover about three-fourths of the Earth's surface and are divided into freshwater biomes (rivers, lakes, ponds, wetlands) and marine biomes (oceans, seas, coral reefs).
e.g. The coral reefs of Lakshadweep are marine biomes rich in biodiversity, while the Ganga River is a freshwater biome.
Tropical Rainforest
Tropical rainforests are dense forests found mainly near the Equator, between the Tropic of Cancer and the Tropic of Capricorn (23.5° N to 23.5° S), in regions that remain hot and wet throughout the year.
e.g. The Amazon Basin in South America, the Congo Basin in Africa, and India's Andaman & Nicobar Islands and Northeastern states contain tropical rainforests.
Gene Bank
Tropical rainforests are known as 'gene banks' because they preserve unique genetic material, supporting conservation and scientific research, and form the world's richest storehouse of biodiversity.
e.g. The Western Ghats rainforests preserve genetic material of species found nowhere else on Earth.
Grassland Biome
Grasslands are large open areas covered mainly with grass and very few trees, developing in regions that receive moderate rainfall insufficient to support dense forests.
e.g. The prairies of North America, the steppes of Asia, and the African Savannas are grasslands.
Temperate Grasslands
Temperate grasslands, such as the prairies in North America and the steppes in Asia, have fertile soil and are often used for farming.
e.g. The prairies of North America are extensively used for wheat cultivation due to their fertile soil.
Tropical Grasslands (Savannas)
Tropical grasslands, also known as Savannas (as in Africa), have scattered trees and are home to large animals such as lions, elephants, and giraffes.
e.g. The African Savanna supports grazing animals like zebras and predators like lions.
Desert Biome
Deserts are the driest biomes, receiving very little rainfall. They can be hot, like the Sahara in Africa, or cold, like the Gobi in Asia.
e.g. The Rann of Kutch in Gujarat is one of the world's largest salt deserts, turning into a marshy wetland during the monsoon and a vast white salt desert during the dry season.
Tundra Biome
The tundra biome is the coldest of all biomes, found near the Arctic and Antarctic regions, with very long, harsh winters and short summers. The soil is frozen almost year-round—a condition called permafrost—which makes it difficult for trees to grow.
e.g. The Arctic tundra supports mosses, lichens, small shrubs, and animals like reindeer, arctic foxes, and polar bears.
Permafrost
Permafrost is a condition where the soil remains frozen almost year-round, making it difficult for trees to grow, characteristic of the tundra biome.
e.g. In the Arctic tundra, permafrost prevents deep root systems, limiting vegetation to mosses and lichens.
Taiga Biome
The taiga biome is characterised by coniferous forests consisting mainly of pines, spruces, and larches.
e.g. The vast coniferous forests of Siberia and Canada are taiga biomes.
Temperate Deciduous Biome
The temperate deciduous biome is characterised by forests of broad-leaved trees that shed their leaves seasonally, with moderate temperatures and distinct seasons.
e.g. Forests in parts of Europe and North America where oak and maple trees shed leaves in autumn.
Biome Pyramid
A biome pyramid is a graphical representation that illustrates the relationship between different organisms within a biome, usually in terms of energy, number, or biomass. At the base are producers (plants and algae), followed by herbivores (primary consumers), carnivores (secondary consumers), and top predators (tertiary consumers).
e.g. In a grassland biome pyramid, grass (producer) forms the base, followed by deer (herbivore), then a wolf (carnivore).
Biodiversity
Biodiversity is the variety of life on Earth, including plants, animals, microorganisms, and the ecosystems they inhabit. It refers not only to the number of different species but also to the genetic differences within species and the variety of habitats and ecological processes that sustain life.
e.g. The Western Ghats contain thousands of endemic plant and animal species, representing high biodiversity.
Hotspots of Biodiversity
Hotspots of biodiversity are certain regions, such as the Himalaya, the Western Ghats, North-East India, and the Andaman & Nicobar Islands, that are rich in unique species found nowhere else. Identifying and protecting these hotspots is a priority in conservation.
e.g. The Western Ghats is a biodiversity hotspot with endemic species like the Nilgiri Tahr.
Ecotourism
Ecotourism refers to responsible travel to nature-friendly places without harming the environment, while supporting local people. In forests, it involves visiting natural areas to enjoy nature while contributing to conservation.
e.g. Thenmala in Kollam district, Keralam, is India's first planned ecotourism destination.
Geographical Indication (GI) Tag
A Geographical Indication (GI) tag is a type of intellectual property right that identifies a product as originating from a specific place, where a given quality, reputation, or other characteristics of the product are essentially linked to its geographic origin.
e.g. Kandhamal Haldi from Odisha and Channapatna Toys from Karnataka are GI-tagged forest products.
Forest Rights Act (FRA), 2006
The Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006, commonly called the Forest Rights Act (FRA), recognises the rights of eligible communities over forest land and forest resources that they have traditionally depended upon. It allows them to collect minor forest produce and grants ownership of small patches of land cultivated by them.
e.g. Mendha Lekha village in Maharashtra became the first in India to gain rights over its forest resources under the FRA.
Ecological Commons
Ecological commons refer to natural resources like forests, rivers, lakes, grazing lands, air, and biodiversity that are shared by a community and used collectively for its survival and well-being. Unlike private property, these resources are not owned by any single individual but belong to the community as a whole.
e.g. Village grazing lands and community ponds used collectively by villagers are ecological commons.
Sacred Groves
Sacred groves are small forest patches protected by local communities for religious and cultural purposes. Across India, there are over 1,00,000 sacred groves, known by different names such as Devrai, Devarakadu, Kavu, and Sarna.
e.g. Devrai groves in Maharashtra preserve rare plants and medicinal species linked to water sources.
Non-Timber Forest Products (NTFPs)
Non-timber forest products are forest resources such as honey, fruits, nuts, resins, medicinal plants, tendu leaves, mahua flowers, lac, and bamboo that help families meet daily needs and earn income without cutting trees.
e.g. Tendu leaves collected in Madhya Pradesh and Chhattisgarh are used for making bidis and provide income to forest dwellers.
Joint Forest Management (JFM)
The Joint Forest Management (JFM) programme encourages local communities to participate in protecting forests while benefiting from forest produce.
e.g. Village forest committees under JFM protect forests and share the benefits of forest produce.
Forest-Influenced Soils
Forest-influenced soils are soil profiles shaped over long periods by forest vegetation, root systems, and organic litter accumulation.
e.g. The forest-influenced soils of Assam's Tezpur region give Tezpur Litchi its distinctive quality.
How It Works
Energy Flow in a Biome Pyramid
  1. Step 1 — Producers (plants and algae) at the base capture solar energy through photosynthesis.
  2. Step 2 — Herbivores (primary consumers) eat producers and obtain energy from them.
  3. Step 3 — Carnivores (secondary consumers) eat herbivores, transferring energy further up.
  4. Step 4 — Top predators (tertiary consumers) occupy the highest level, consuming other carnivores.
  5. Step 5 — At each trophic level, energy is lost as heat during metabolic processes, so the number of organisms, biomass, and available energy decrease as we move up the pyramid.
💡 Students often forget that energy decreases at each successive trophic level due to heat loss during metabolic processes—not because organisms are 'smaller' or 'weaker'.
Classification of Terrestrial Biomes Based on Climate
  1. Step 1 — Identify the temperature range of the region (hot, moderate, or cold).
  2. Step 2 — Identify the precipitation pattern (high rainfall, moderate rainfall, or very little rainfall).
  3. Step 3 — Match the combination of temperature and precipitation to the biome type: hot and wet = forest; moderate rainfall = grassland; very little rainfall = desert; extremely cold with frozen soil = tundra.
  4. Step 4 — Identify the dominant plant species and growth forms of vegetation characteristic of that biome.
💡 Students often confuse grasslands with deserts—grasslands receive moderate rainfall (not enough for forests but more than deserts), while deserts receive very little rainfall.
Geographical Aspects of Biodiversity Conservation
  1. Step 1 — Identify hotspots of biodiversity (regions rich in unique species) such as the Himalaya, Western Ghats, North-East India, and Andaman & Nicobar Islands.
  2. Step 2 — Apply ecosystem-based conservation strategies suited to the geographical setting (e.g., mangrove protection along coasts, afforestation in mountains).
  3. Step 3 — Establish protected areas (national parks, wildlife sanctuaries, biosphere reserves, World Heritage Sites) based on geography to preserve critical habitats.
  4. Step 4 — Use knowledge of geographical barriers and corridors (rivers, mountains, valleys) to create wildlife corridors for animal movement and gene flow.
  5. Step 5 — Consider human-environment interaction and promote sustainable practices suited to geography (e.g., terrace farming in hills, agroforestry in plains).
💡 Students often list only 'protected areas' as conservation strategy and miss the geographical aspects—hotspots, corridors, and ecosystem-based approaches are equally important.
Community Forest Management in Mendha Lekha
  1. Step 1 — The village, inhabited mainly by the Gond tribe, follows the principle of 'Mawa Nate Mawa Raj' (our village, our rule), ensuring all decisions are made collectively through the Gram Sabha.
  2. Step 2 — The village gained rights over its 1,800 hectares of forest under the Forest Rights Act (2006), becoming the first in India to do so.
  3. Step 3 — The community protects the forest by regulating tree cutting, preventing forest fires, and promoting bamboo harvesting as a renewable resource.
  4. Step 4 — Revenue from forest produce is used for community welfare activities such as education and infrastructure.
  5. Step 5 — The model demonstrates how traditional knowledge, rights, duties, and democratic participation can coexist to achieve sustainable forest conservation.
💡 Students often forget that Mendha Lekha was the FIRST village in India to gain forest rights under FRA 2006—this specific detail is frequently asked in exams.
Commons-Based Fisheries Management in Bihar
  1. Step 1 — Historically, control over perennial water bodies and diara waterfronts in Bihar was held by large landowners who marginalised the fishing community.
  2. Step 2 — The Bihar Fish Jalkar Management Act, 2006, and its subsequent amendments were introduced to promote community-led management.
  3. Step 3 — Legal safeguards for public access and cooperative resource stewardship were established as sustainable alternatives.
  4. Step 4 — Local communities develop context-specific solutions to balance the productivity of local resources with sustainable rates of exploitation.
  5. Step 5 — The success of this model is reflected in the persistent growth of fish production in the region.
💡 Students often confuse this with the Forest Rights Act—the Bihar Fish Jalkar Management Act, 2006 is specifically for fisheries, not forests.
Exam Traps — Don't Make These Mistakes
⚠ Biome vs Ecosystem Confusion
✗ A biome is a small area where plants and animals interact, just like an ecosystem.
→ This reverses the scale relationship. A biome is a LARGE natural region (like a broad environmental region), while an ecosystem is a smaller 'neighbourhood' within it. Writing them as equivalent or reversing the hierarchy loses marks.
✓ A biome is a large natural region of the world where certain types of plants and animals live under similar climatic conditions. An ecosystem is like a neighbourhood within a biome, where plants, animals, and non-living things interact closely.
⚠ Grassland Rainfall Misconception
✗ Grasslands develop in regions that receive no rainfall, which is why trees cannot grow.
→ Grasslands receive MODERATE rainfall—not zero rainfall. The rainfall is insufficient to support dense forests but enough to support grass. Deserts, not grasslands, receive very little rainfall.
✓ Grasslands develop in regions that receive moderate rainfall, which is not enough to support dense forests but sufficient for grass growth.
⚠ Tundra Location Error
✗ The tundra biome is found only in the Arctic region, not in the Antarctic.
→ The tundra biome is found near BOTH the Arctic AND Antarctic regions. Limiting it to only the Arctic is factually incorrect and shows incomplete reading of the chapter.
✓ The tundra biome is the coldest of all and is found near the Arctic and Antarctic regions, with very long, harsh winters and short summers.
⚠ Energy Pyramid Direction Error
✗ As we move up the biome pyramid, the number of organisms and available energy increase because top predators are the strongest.
→ This is conceptually backwards. Energy is LOST as heat at each trophic level during metabolic processes, so the number of organisms, biomass, and available energy DECREASE as we move up the pyramid.
✓ As we move up the pyramid, the number of organisms, biomass, and available energy decrease as energy is lost at each trophic level as heat during metabolic processes.
⚠ GI Tag Misinterpretation
✗ A GI tag is given to any product that is popular in India, regardless of its origin.
→ A GI tag is specifically linked to a product's GEOGRAPHIC ORIGIN. The quality, reputation, or characteristics of the product must be essentially linked to that specific place. Popularity alone does not qualify a product for a GI tag.
✓ A Geographical Indication (GI) tag identifies a product as originating from a specific place, where a given quality, reputation, or other characteristics of the product are essentially linked to its geographic origin.
⚠ Forest Rights Act Scope Confusion
✗ The Forest Rights Act, 2006 gives forest dwellers complete ownership of all forest land and allows them to cut trees freely.
→ The FRA grants rights over forest land and resources that communities have TRADITIONALLY depended upon—it does not give blanket ownership of all forest land or unrestricted tree cutting. It allows collection of minor forest produce and ownership of small patches of traditionally cultivated land.
✓ The Forest Rights Act, 2006 recognises the rights of eligible communities over forest land and forest resources that they have traditionally depended upon, allowing them to collect minor forest produce and granting ownership of small patches of land cultivated by them.
Compare & Contrast
Climate and vegetation
Tropical Rainforest
Tundra
Tropical rainforests are hot and wet throughout the year, supporting dense, multi-layered forests near the Equator, while the tundra is the coldest biome with permafrost, supporting only mosses, lichens, and small shrubs near the Arctic and Antarctic regions.
Vegetation and animal life
Temperate Grasslands
Tropical Grasslands (Savannas)
Temperate grasslands (prairies, steppes) have fertile soil, are mostly treeless, and are used for farming, while tropical grasslands (Savannas) have scattered trees and are home to large animals such as lions, elephants, and giraffes.
Type of water and biodiversity
Freshwater Biomes
Marine Biomes
Freshwater biomes include rivers, lakes, ponds, and wetlands, crucial for agriculture and drinking water, supporting species like fish, frogs, and insects; marine biomes include oceans, seas, and coral reefs, which are rich in biodiversity and influence Earth's climate by storing and distributing heat.
Scale and scope
Biome
Ecosystem
A biome is a large natural region with similar climatic conditions supporting certain types of plants and animals, while an ecosystem is a smaller 'neighbourhood' within a biome where plants, animals, and non-living things interact closely.
Exam Focus
Marks pattern: This chapter typically appears as: 1-2 MCQs (1 mark each) testing definitions and biome identification, 1 Short Answer question (3 marks) on biome characteristics or biodiversity conservation, and 1 Long Answer question (5 marks) on forest communities, FRA, or interconnectedness of biomes and living beings. Map-based questions on biodiversity hotspots may also appear.
Most asked: Definition and types of biomes (terrestrial and aquatic) · Characteristics of forest, grassland, desert, and tundra biomes · Biodiversity and its conservation (hotspots, protected areas) · Forest Rights Act, 2006 and community forest management (Mendha Lekha case study) · Geographical Indication (GI) tags and forest products · Ecological commons and traditional water management systems
Don't skip: Explain the different types of terrestrial biomes with examples (5 marks); Describe the Forest Rights Act, 2006 and its significance for forest dwellers, with reference to Mendha Lekha (5 marks); What is biodiversity? Discuss the geographical aspects of biodiversity conservation (5 marks); Explain the interconnectedness between biomes and living beings (3-5 marks)
Safe to skip: The specific details of the Bihar Fish Jalkar Management Act, 2006 and the historical water tank systems (Chandella and Bundela kings, keres, eri tanks, chevuru tanks, ahar pynes, katas) are low-weightage and can be de-prioritised under time pressure, though a one-line mention of ecological commons is advisable.
One-Line Revision (read aloud before the exam)
  1. A biome is a large natural region of the world where certain types of plants and animals live under similar climatic conditions.
  2. The word 'biome' combines 'bio' (Greek 'bios', meaning life) and '-ome' (a suffix denoting a group of biological constituents).
  3. An ecosystem is like a neighbourhood within a biome, where plants, animals, and non-living things interact closely.
  4. Terrestrial biomes are classified into forests, grasslands, deserts, and tundra, based on their climate.
  5. Tropical rainforests are found near the Equator, between the Tropic of Cancer and the Tropic of Capricorn (23.5° N to 23.5° S).
  6. Tropical rainforests are known as 'gene banks' because they preserve unique genetic material and form the world's richest storehouse of biodiversity.
  7. Grasslands develop in regions that receive moderate rainfall, which is not enough to support dense forests.
  8. Temperate grasslands (prairies, steppes) have fertile soil and are often used for farming.
  9. Tropical grasslands, also known as Savannas, have scattered trees and are home to lions, elephants, and giraffes.
  10. Deserts are the driest biomes, receiving very little rainfall, and can be hot (Sahara) or cold (Gobi).
  11. The Rann of Kutch in Gujarat is one of the world's largest salt deserts.
  12. The tundra biome is the coldest of all, found near the Arctic and Antarctic regions, with permafrost making tree growth difficult.
  13. Permafrost is a condition where the soil remains frozen almost year-round.
  14. The taiga biome is characterised by coniferous forests consisting mainly of pines, spruces, and larches.
  15. The temperate deciduous biome has broad-leaved trees that shed their leaves seasonally, with moderate temperatures and distinct seasons.
  16. Aquatic biomes cover about three-fourths of the Earth's surface and are divided into freshwater and marine biomes.
  17. Freshwater biomes include rivers, lakes, ponds, and wetlands; marine biomes include oceans, seas, and coral reefs.
  18. A biome pyramid illustrates the relationship between organisms in terms of energy, number, or biomass.
  19. At the base of the biome pyramid are producers (plants and algae) that capture solar energy through photosynthesis.
  20. As we move up the biome pyramid, the number of organisms, biomass, and available energy decrease due to energy lost as heat at each trophic level.
  21. Biodiversity is the variety of life on Earth, including plants, animals, microorganisms, and the ecosystems they inhabit.
  22. Hotspots of biodiversity in India include the Himalaya, the Western Ghats, North-East India, and the Andaman & Nicobar Islands.
  23. Ecotourism refers to responsible travel to nature-friendly places without harming the environment, while supporting local people.
  24. Thenmala in Kollam district, Keralam, is India's first planned ecotourism destination.
  25. A Geographical Indication (GI) tag identifies a product as originating from a specific place, with quality linked to its geographic origin.
  26. Kandhamal Haldi (Odisha), Channapatna Toys (Karnataka), and Tezpur Litchi (Assam) are GI-tagged forest products.
  27. The Forest Rights Act (FRA), 2006 recognises the rights of forest dwellers over forest land and resources they have traditionally depended upon.
  28. Mendha Lekha in Maharashtra became the first village in India to gain rights over its forest resources under the FRA, 2006.
  29. Sacred groves are small forest patches protected by local communities for religious and cultural purposes, known as Devrai, Devarakadu, Kavu, and Sarna.
  30. Ecological commons are natural resources like forests, rivers, lakes, grazing lands, air, and biodiversity shared by a community and used collectively.
  31. The Bishnoi Movement in Rajasthan, led by Amrita Devi, and the Chipko Movement in Uttarakhand are examples of community forest protection.
  32. The Joint Forest Management (JFM) programme encourages local communities to participate in protecting forests while benefiting from forest produce.
  33. The Swadesh Darshan 2.0 Scheme aims to develop sustainable tourism destinations with a focus on conservation and local community involvement.
  34. Forests play an important role in maintaining oxygen levels and balancing the Earth's climate, hence they are called the 'lungs of the Earth'.

MCQs — 10 Questions with Answers

Q1. Which of the following biomes is characterised by permafrost and is found near the Arctic and Antarctic regions?

  • A. Tundra biome ✓
  • B. Taiga biome
  • C. Temperate deciduous biome
  • D. Tropical rainforest biome

Answer: A — Tundra biomes have permanently frozen soil called permafrost and are located in polar regions, while taiga is found in subpolar regions with coniferous forests.

Q2. What is the primary reason why tropical rainforests are considered 'gene banks'?

  • A. They store seeds in underground vaults for future use
  • B. They preserve unique genetic material and support conservation research due to rich biodiversity ✓
  • C. They produce more oxygen than other biomes
  • D. They are used only for genetic engineering experiments

Answer: B — Rainforests contain the world's richest biodiversity with unique species and genetic resources essential for scientific research and conservation efforts, earning them the 'gene bank' title.

Q3. Which of the following is NOT a terrestrial biome?

  • A. Desert biome
  • B. Coral reef biome ✓
  • C. Grassland biome
  • D. Tundra biome

Answer: B — Coral reefs are marine (aquatic) biomes found in oceans, whereas deserts, grasslands, and tundra are all terrestrial (land-based) biomes.

Q4. In a biome pyramid, why does the number of organisms decrease at each level moving upward?

  • A. Predators eat all the herbivores available
  • B. Energy is lost at each trophic level as heat during metabolic processes ✓
  • C. Top predators produce fewer offspring than other animals
  • D. Carnivores migrate to other biomes to find food

Answer: B — Energy efficiency decreases through trophic levels because organisms use energy for metabolism, growth, and movement, so less energy is available for the next level.

Q5. A student observes that the Nubra Valley camel in Ladakh has denser fur than the Rajasthan camel. Which concept best explains this difference?

  • A. Both camels are from deserts, so they must look identical
  • B. Camels adapt their fur density to local climatic conditions; colder Ladakh requires thicker fur for insulation ✓
  • C. Nubra Valley camels are a different species from Rajasthan camels
  • D. Denser fur helps camels store more water for survival

Answer: B — Organisms adapt specific traits to survive their local environment; Ladakh's colder climate necessitates denser fur for thermal insulation, while Rajasthan's hot desert allows lighter fur.

Q6. What is the main purpose of a Geographical Indication (GI) tag for forest products like Kandhamal Haldi?

  • A. To increase the price of all turmeric products globally
  • B. To identify a product as originating from a specific region where its unique quality is linked to that location, protecting it and benefiting local communities ✓
  • C. To prevent farmers from other regions from growing turmeric
  • D. To guarantee that the product is organic and chemical-free

Answer: B — GI tags protect region-specific products by establishing their origin-linked uniqueness, which enhances market value and ensures economic benefits reach local communities through exclusive recognition.

Q7. The Forest Rights Act 2006 recognises the rights of forest dwellers. Which of the following is a right granted under this Act?

  • A. The right to cut down all trees in their area without restriction
  • B. The right to collect minor forest produce such as bamboo and honey, and ownership of small patches of traditionally cultivated land ✓
  • C. The right to sell forest land to private companies for development
  • D. The right to hunt endangered species for food

Answer: B — The Forest Rights Act grants eligible communities rights to sustainably collect minor forest products and own cultivated land patches, balancing livelihood needs with forest conservation.

Q8. Ecological commons such as forests and rivers are shrinking due to population growth and privatisation. Which consequence of this is most likely to occur?

  • A. Forest dwellers gain more income from private companies
  • B. Rural communities lose access to vital resources for food, water, and fuel, threatening their livelihoods and ecological balance ✓
  • C. Biodiversity increases because fewer people can access the resources
  • D. Climate change is completely reversed due to less human activity

Answer: B — When commons shrink through privatisation and degradation, rural and tribal communities—who depend on these shared resources—face food insecurity, livelihood loss, and reduced access to essential resources.

Q9. Ecotourism in forests like Thenmala in Keralam differs from mass tourism because ecotourism emphasises:

  • A. Maximising tourist numbers to earn more revenue for government
  • B. Minimal environmental impact, respect for local communities, learning about ecosystems, and ensuring tourism benefits reach locals as guides and service providers ✓
  • C. Building large resorts and hotels throughout the forest
  • D. Allowing unrestricted hunting and resource extraction by visitors

Answer: B — Ecotourism prioritises sustainable practices that protect forests while engaging local communities as stakeholders and educators, unlike mass tourism which prioritises visitor numbers over environmental and social impact.

Q10. Which of the following statements correctly describes the relationship between forest dwellers and biodiversity conservation in India?

  • A. Forest dwellers destroy biodiversity by collecting forest products for livelihood
  • B. Forest dwellers are barriers to conservation and should be relocated from forests
  • C. Forest dwellers possess traditional knowledge of sustainable resource use and have historically protected forests, making them essential partners in biodiversity conservation ✓
  • D. Biodiversity conservation can only be achieved by preventing all human activity in forests

Answer: C — Forest dwellers are knowledge holders of sustainable practices passed through generations, and movements like Chipko and Bishnoi demonstrate their active role as forest protectors rather than threats to conservation.

Flashcards

Define biome with an example.

A biome is a large natural region with similar climate where specific plants and animals live together, such as tropical rainforests near the Equator.

What is the difference between a biome and an ecosystem?

A biome is a broad environmental region with similar climate and life forms, while an ecosystem is a smaller neighbourhood within a biome where organisms and non-living things interact closely.

Name three terrestrial biomes and one characteristic of each.

Forest biomes are dense and wet; grasslands have moderate rainfall; deserts are extremely dry; tundra biomes are frozen year-round with permafrost.

What is a biome pyramid and what does it show?

A biome pyramid is a graphical representation showing energy, biomass, or number of organisms at each trophic level, with producers at the base and top predators at the apex.

Define biodiversity in one sentence.

Biodiversity is the variety of all living organisms—plants, animals, microorganisms—and the ecosystems they inhabit on Earth.

What is a GI tag and why is it important for forest products?

A Geographical Indication tag identifies a product as originating from a specific region where its unique quality is linked to that location, protecting region-specific forest products and benefiting local communities.

What is the Forest Rights Act (FRA) 2006 and what rights does it grant?

The Forest Rights Act recognises the rights of eligible tribal and forest-dwelling communities to collect minor forest produce like bamboo and honey, and to own small patches of traditionally cultivated land.

What are ecological commons and why are they important?

Ecological commons are shared natural resources like forests, rivers, and grazing lands collectively managed by communities; they are vital for rural livelihoods and maintaining ecological balance.

Name two challenges faced by forest dwellers.

Forest dwellers face limited access to education and healthcare, and conflicts with wildlife such as crop damage by elephants and monkeys causing economic losses and insecurity.

What is ecotourism and how does it balance conservation with development?

Ecotourism is responsible travel to forests that minimises environmental impact while generating income for local communities and supporting conservation programmes through visitor fees and employment.

Important Board Questions

Define biome and distinguish it from an ecosystem. Provide one example of each. [2 marks]

Biome = large region with similar climate and life forms; ecosystem = smaller local unit with organism-environment interaction. Example: Amazon is a biome; a rainforest pond is an ecosystem within it.

Explain how climate and physiography determine the type of vegetation and animal life in a biome. Use an example of any terrestrial biome to illustrate your answer. [3 marks]

Show cause-effect: temperature + rainfall → vegetation type → animal adaptation. Example: Tundra's permafrost + freezing temperatures → only mosses/lichens can grow → animals like reindeer and arctic foxes have thick fur and fat layers.

Analyse the case study of Mendha Lekha village. How does community-based forest management contribute to both forest conservation and livelihood security? Discuss the role of traditional knowledge and democratic participation in achieving this balance. [5 marks]

Key points: Forest Rights Act enabled local control; Gram Sabha (democratic body) makes collective decisions; sustainable practices like regulated tree cutting and bamboo harvesting; revenue reinvested in community welfare; traditional Gond practices honour forest conservation; model shows integration of rights, duties, and participatory governance for sustainable development.

Assertion-Reason Questions for Life on Earth

Q1. Assertion (A):

Taiga biomes are characterized by coniferous forests and are found in subpolar regions with very cold winters.

Reason (R):

Coniferous trees like pines and spruces can withstand extreme cold and short growing seasons better than broad-leaved deciduous trees.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both the assertion and reason are true. Taiga (boreal forest) consists of conifers adapted to cold subpolar climates, and the reason correctly explains why conifers dominate these regions. The reason is the correct ecological explanation for the assertion.

Q2. Assertion (A):

Tropical rainforests are called 'gene banks' because they preserve unique genetic material and support scientific research.

Reason (R):

Rainforests have the highest biodiversity on Earth, making them important for conservation and genetic studies.

Answer: B — Both A and R are true, but R is NOT the correct explanation of A — Both assertion and reason are factually true, but the reason does not explain why rainforests are called 'gene banks.' The reason describes what makes rainforests biodiverse, not why they function as repositories of genetic resources for research and conservation purposes. The term 'gene bank' specifically refers to their role in preserving genetic diversity.

Q3. Assertion (A):

The Forest Rights Act, 2006 recognises the rights of tribal and forest-dwelling communities over traditional forest resources.

Reason (R):

The Forest Rights Act, 2006 bans forest dwellers from collecting minor forest produce such as bamboo and honey.

Answer: C — A is true but R is false — The assertion is true. The reason is false: the Act recognises the right to collect minor forest produce such as bamboo and honey; it does not ban it.

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Case-Based Questions (CBQ) for Life on Earth

Case Study:

The Thenmala Ecotourism project in Keralam's Kollam district demonstrates how sustainable tourism can balance recreation with conservation. Located in the Western Ghats (a UNESCO World Heritage Site), Thenmala employs local forest dwellers as guides and service providers, ensuring tourism revenue directly benefits the community. Visitors explore the forest canopy while learning about local ecosystems, and strict regulations limit environmental impact. The project shows that forest conservation and economic development can coexist when managed with community participation and ecological awareness.

Q1. Thenmala, which means 'Honey Hill', lies within which region that is a UNESCO World Heritage Site?

  • A. Western Ghats ✓
  • B. Eastern Ghats
  • C. Himalaya
  • D. Aravalli Range

Answer: A

Q2. How does Thenmala ecotourism exemplify the concept of ecological commons management?

  • A. By converting forests into private property owned by tourism companies
  • B. By restricting local communities from accessing forest resources
  • C. By involving local communities as stakeholders in forest management while generating shared economic benefits ✓
  • D. By prioritizing tourist enjoyment over environmental conservation

Answer: C

Q3. According to the passage, what is the primary reason Thenmala's model is considered sustainable?

  • A. It maximizes the number of tourists visiting the forest annually
  • B. It balances ecological conservation with community livelihoods through limited impact, forest protection, and benefit-sharing ✓
  • C. It eliminates all forest regulations to encourage visitor freedom
  • D. It focuses solely on preserving ancient cultural practices

Answer: B

Q4. Which government scheme mentioned in the chapter could support the expansion of projects like Thenmala to other regions?

  • A. Swadesh Darshan 2.0 Scheme for sustainable tourism development ✓
  • B. Pradhan Mantri Ujjwala Yojana for household fuel access
  • C. Scheduled Tribes classification exclusively
  • D. Forest Fire Prevention Act alone

Answer: A

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