Biodiversity, forests, and wildlife are essential for maintaining a healthy and balanced environment. In this TNPSC Biology, Environment and Ecology Test, test your knowledge of Biodiversity, Forests and Wildlife Conservation and strengthen your preparation with useful explanations. The questions are designed to help you understand key environmental concepts while also preparing you for the type of factual and conceptual questions that can appear in TNPSC examinations.
Note: Detailed explanations for every question are provided below the test to help you review the answers and strengthen your TNPSC exam preparation.
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TNPSC Biology Environment and Ecology Test 4 – Study Notes & Quick Revision
Understanding Biodiversity, Forests and Wildlife Conservation is important for building a strong foundation in Environment and Ecology for TNPSC preparation. In this section, each answer is explained clearly, covering the three levels of biodiversity, its importance, major threats, endangered and extinct species, conservation methods, protected areas, Tamil Nadu’s biosphere and marine conservation, and forest conservation. These explanations will help you revise the key concepts while understanding why each answer is correct
1. What does biodiversity refer to?
✅ Correct Answer : A. Variety of living organisms
Detailed Explanation
Biodiversity refers to the variety of living organisms found on Earth. The term includes the wide range of plants, animals, microorganisms, and other forms of life, as well as the differences found among them.
Biodiversity is commonly studied at three levels:
- Genetic diversity – The variation in genes among individuals of the same species. For example, different varieties of rice may have different characteristics such as grain size, colour, and resistance to diseases.
- Species diversity – The variety of different species found in a particular region. A forest containing different species of trees, birds, mammals, insects, and reptiles has high species diversity.
- Ecosystem diversity – The variety of different ecosystems and habitats in an area. Forests, grasslands, wetlands, mangroves, and marine ecosystems are examples of different ecosystems.
Biodiversity is important because living organisms are interconnected and perform various roles in ecosystems. Plants provide food and oxygen, insects help in pollination, microorganisms contribute to decomposition, and animals participate in food chains and other ecological processes.
Therefore, biodiversity represents the richness and variety of life, from variations within a species to the diversity of species and ecosystems.
Why is the answer correct?
A. Variety of living organisms is correct because biodiversity literally concerns the diversity or variety of life. It covers differences within species, between different species, and among ecosystems.
Why are the other options wrong?
- B. Variation in climate ❌
Climate refers to the long-term pattern of atmospheric conditions such as temperature, rainfall, humidity, and wind. Climate can influence biodiversity, but it is not biodiversity itself. - C. Types of soil ❌
Soil types are part of the physical or abiotic environment. Different soils can support different organisms, but soil variety does not mean biodiversity. - D. Distribution of rainfall ❌
Rainfall distribution is a climatic factor that affects vegetation and ecosystems. It may influence the distribution of organisms, but it does not define biodiversity.
Real-Life Example
The Western Ghats are a good example of a region with rich biodiversity. They support numerous species of plants, mammals, birds, reptiles, amphibians, insects, and microorganisms, along with different forest ecosystems.
2. Which level of biodiversity refers to variation within a species?
✅ Correct Answer : B. Genetic diversity
Detailed Explanation:
Genetic diversity refers to the variation in genetic characteristics among individuals of the same species. Although individuals belong to the same species, they may differ in characteristics such as size, colour, disease resistance, growth rate, and ability to adapt to environmental conditions. These differences arise from variations in their genes.
Genetic diversity is important because it helps a species adapt to changing environmental conditions and increases its ability to survive diseases, pests, and other environmental pressures. A population with greater genetic variation is generally better able to respond to changes in its surroundings.
For example, different varieties of rice belong to the same species but may differ in their grain characteristics, duration of growth, or resistance to particular diseases. Such differences represent genetic diversity.
Why is the answer correct?
B. Genetic diversity is correct because it specifically refers to genetic variation within individuals or populations of the same species. It is one of the three major levels of biodiversity.
Why are the other options wrong?
- A. Species diversity ❌
Species diversity refers to the variety of different species present in a particular area, rather than variations within one species. - C. Ecosystem diversity ❌
Ecosystem diversity refers to the variety of ecosystems and habitats in a region, such as forests, wetlands, grasslands, and marine ecosystems. - D. Habitat diversity ❌
Habitat diversity refers to the variety of habitats or living environments available in an area. It is not the genetic variation within a species.
Real-Life Example
Different varieties of rice grown in India may belong to the same species but possess different characteristics such as grain size, taste, growth period, and resistance to diseases. This variation within the same species is an example of genetic diversity.
3. The variety of different species found in a particular area is called
Correct Answer: C. Species diversity
Detailed Explanation
Species diversity refers to the variety of different species present in a particular area or ecosystem. It considers the number of different species as well as their relative abundance in an area.
For example, a forest may contain many different species of trees, birds, mammals, reptiles, insects, and microorganisms. The presence of a wide range of species indicates high species diversity.
Species diversity is an important part of biodiversity because each species performs particular roles in an ecosystem. The loss of species can disturb ecological relationships and affect the functioning of the ecosystem.
Why is the answer correct?
C. Species diversity is correct because it specifically describes the variety of different species occurring in a particular area.
Why are the other options wrong?
- A. Genetic diversity ❌
Genetic diversity refers to variations in genetic characteristics within the same species. - B. Ecosystem diversity ❌
Ecosystem diversity refers to the variety of different ecosystems found in a region. - D. Habitat diversity ❌
Habitat diversity refers to the variety of living environments or habitats available in an area, rather than the variety of species.
Real-Life Example : A tropical forest containing many species of trees, birds, mammals, amphibians, and insects has high species diversity.
4. Which of the following represents ecosystem diversity?
Correct Answer: C. Different types of ecosystems
Detailed Explanation
Ecosystem diversity refers to the variety of different ecosystems present in a particular geographical region. An ecosystem includes living organisms and their physical surroundings interacting with each other.
Different ecosystems have different environmental conditions, organisms, and ecological processes. Examples include forests, grasslands, wetlands, deserts, mangroves, and marine ecosystems.
Ecosystem diversity is an important level of biodiversity because different ecosystems provide different ecological services and support different forms of life.
Why is the answer correct?
C. Different types of ecosystems is correct because ecosystem diversity specifically refers to the variety of ecosystems found in a region.
Why are the other options wrong?
- A. Different varieties of rice ❌
These represent genetic diversity, because they are different varieties within the same species. - B. Different species of birds ❌
This represents species diversity, as it involves different species. - D. Different individuals of one species ❌
Differences among individuals of the same species are related to genetic diversity.
Real-Life Example : Tamil Nadu contains different ecosystems such as forests, wetlands, mangroves, grasslands, and marine ecosystems. The presence of these different ecosystems represents ecosystem diversity.
5. Which of the following is an important value of biodiversity?
Correct Answer: A. Ecosystem stability
Detailed Explanation
Biodiversity plays an important role in maintaining ecosystem stability. Different organisms perform different functions within an ecosystem. Plants act as producers, animals participate in food chains, insects help in pollination, and microorganisms contribute to decomposition and nutrient cycling.
When an ecosystem has a variety of species, the functions performed by different organisms help maintain ecological processes. Greater biodiversity can also improve the ability of ecosystems to respond to environmental changes and recover from disturbances.
Biodiversity also provides humans with food, medicines, raw materials, genetic resources, and other ecosystem services. Therefore, conserving biodiversity is essential for both environmental balance and human well-being.
Why is the answer correct?
A. Ecosystem stability is correct because biodiversity supports the proper functioning of ecosystems and helps maintain their stability and resilience.
Why are the other options wrong?
- B. Habitat destruction ❌
Habitat destruction is a major threat to biodiversity, not a value or benefit of biodiversity. - C. Species extinction ❌
Species extinction represents the loss of biodiversity and can negatively affect ecosystem functioning. - D. Resource depletion ❌
Resource depletion occurs when natural resources are used faster than they can be replenished. It is an environmental problem, not a value of biodiversity.
Real-Life Example : A diverse forest contains many plants, animals, insects, fungi, and microorganisms. Their interconnected roles help maintain processes such as pollination, decomposition, nutrient cycling, and food chains, contributing to ecosystem stability.
6. Which of the following is a major cause of biodiversity loss?
Correct Answer: A. Habitat destruction
Detailed Explanation
Habitat destruction is one of the major causes of biodiversity loss. A habitat is the natural place where an organism lives, obtains food, reproduces, and finds shelter. When natural habitats are destroyed, reduced, or fragmented, the organisms depending on them may lose their food sources, breeding areas, and shelter.
Habitat destruction can occur due to activities such as deforestation, conversion of land for agriculture, urban expansion, construction of roads and industries, mining, and other development activities. When a habitat becomes too small or is completely destroyed, species may decline in number and may eventually become threatened or extinct.
Habitat destruction can also divide a large continuous habitat into smaller isolated patches. This is known as habitat fragmentation, and it can make it difficult for animals to move, find food, reproduce, and maintain healthy populations.
Why is the answer correct?
A. Habitat destruction is correct because destroying or altering natural habitats directly reduces the places where species can survive and reproduce. This can lead to population decline and biodiversity loss.
Why are the other options wrong?
- B. Seed dispersal ❌
Seed dispersal is a natural process through which seeds are transported away from the parent plant. It helps plants spread and regenerate and is generally beneficial to ecosystems. - C. Natural regeneration ❌
Natural regeneration is the process by which vegetation naturally replaces or restores itself. It helps maintain plant populations and ecosystems. - D. Pollination ❌
Pollination is the transfer of pollen that enables many plants to reproduce. It supports plant reproduction and contributes to ecosystem functioning.
Real-Life Example : The clearing of forests for agriculture, roads, settlements, and other development can destroy natural habitats and reduce the populations of species that depend on those forests.
7. The conversion of forest land into agricultural or other non-forest land is commonly associated with
Correct Answer: B. Deforestation
Detailed Explanation
Deforestation is the permanent or long-term removal or clearing of forests, often to use the land for purposes such as agriculture, settlements, industries, roads, mining, and other development activities.
When forest land is converted into agricultural land, the original forest ecosystem is replaced by another type of land use. This reduces forest cover and can destroy or fragment the habitats of many plants and animals.
Deforestation can also contribute to soil erosion, loss of biodiversity, disruption of the water cycle, and increased carbon dioxide in the atmosphere. Therefore, controlling deforestation is an important part of forest and biodiversity conservation.
It is different from afforestation, which involves establishing forests on land that was not previously under forest cover, and reforestation, which involves restoring forest cover in areas where forests have been removed or degraded.
Why is the answer correct?
B. Deforestation is correct because the conversion or clearing of forest land for agriculture and other non-forest uses results in the loss of forest cover.
Why are the other options wrong?
- A. Afforestation ❌
Afforestation is the establishment of forest on land that was not previously forested. - C. Reforestation ❌
Reforestation means re-establishing forest cover in an area where forests have previously been removed or lost. - D. Forest regeneration ❌
Forest regeneration refers to the renewal or restoration of forest vegetation, either naturally or through human efforts.
Real-Life Example : When a forest area is cleared and converted into farmland, the loss of the original forest cover is an example of deforestation.
8. Excessive use of biological resources beyond their capacity to recover is called
Correct Answer: B. Overexploitation
Detailed Explanation
Overexploitation occurs when biological or natural resources are used or harvested at a rate faster than their natural ability to reproduce or recover. As a result, the population or resource may decline over time.
Biological resources include plants, animals, fish, timber, medicinal plants, and other organisms. When these resources are continuously collected, hunted, logged, or harvested without allowing sufficient time for regeneration, their populations can become depleted.
Overexploitation is an important threat to biodiversity because excessive removal of organisms from nature can reduce their populations and disturb food chains and ecological relationships. If the pressure continues for a long period, some species may become endangered or even extinct.
Why is the answer correct?
B. Overexploitation is correct because the term specifically describes the excessive use or harvesting of biological resources beyond their natural recovery capacity.
Why are the other options wrong?
- A. Conservation ❌
Conservation means the protection and sustainable management of natural resources and biodiversity. It aims to prevent excessive exploitation. - C. Restoration ❌
Restoration involves helping damaged or degraded ecosystems and habitats recover. - D. Afforestation ❌
Afforestation involves establishing forests on land that was not previously forested. It is a method of increasing forest cover, not excessive resource use.
Real-Life Example : Excessive fishing that removes fish from the sea faster than their populations can reproduce is an example of overexploitation.
9. Illegal hunting or capturing of wild animals is known as
Correct Answer: A. Poaching
Detailed Explanation
Poaching refers to the illegal hunting, capturing, killing, or collecting of wild animals and other wildlife in violation of wildlife protection laws. It is a major threat to biodiversity because it can rapidly reduce the populations of wild species.
Animals may be illegally hunted for their meat, skin, fur, horns, tusks, bones, feathers, or other valuable body parts. Some species are also captured illegally for the illegal wildlife trade.
Poaching can have serious ecological consequences. When the population of an important species decreases, it can disturb food chains and ecological relationships. Continued illegal hunting can also push already threatened species closer to extinction.
Why is the answer correct?
A. Poaching is correct because poaching specifically refers to the illegal taking or hunting of wildlife.
Why are the other options wrong?
- B. Grazing ❌
Grazing is the feeding of livestock or wild herbivores on vegetation. It is not the illegal hunting of wildlife. - C. Migration ❌
Migration is the movement of animals from one region to another, often seasonally, for food, breeding, or suitable environmental conditions. - D. Domestication ❌
Domestication is the process of bringing wild animals or plants under human control and selectively breeding them for useful characteristics.
Real-Life Example : The illegal hunting of tigers for their body parts or elephants for their ivory is an example of poaching.
10. Which of the following best describes an invasive species?
Correct Answer: B. A species introduced into an area that may harm native species
Detailed Explanation
An invasive species is a non-native species that is introduced into an area and becomes capable of spreading and causing ecological, economic, or other harm. It may compete with native species for food, water, space, or other resources.
Some introduced species do not cause significant problems, but an invasive species can establish itself rapidly because it may have few natural predators or competitors in the new environment. As its population increases, it can alter habitats and reduce the populations of native organisms.
Invasive species are therefore considered an important threat to biodiversity. They can change the structure and functioning of ecosystems and may sometimes lead to the decline of native species.
Why is the answer correct?
B. A species introduced into an area that may harm native species is correct because invasive species are introduced outside their natural range and can spread and negatively affect native species or ecosystems.
Why are the other options wrong?
- A. A species restricted to one habitat ❌
A species restricted to a particular geographical area is generally described as endemic, not invasive. - C. A species protected inside a national park ❌
Protection within a national park is a conservation measure and does not define an invasive species. - D. A species that has become extinct ❌
An extinct species is one that no longer exists anywhere on Earth. It cannot be described as an invasive species.
Real-Life Example : Water hyacinth is an example of an invasive plant in many parts of India. It can spread rapidly in water bodies, cover the water surface, and interfere with aquatic ecosystems.
11. A species facing a very high risk of extinction in the wild is classified as
Correct Answer: A. Endangered
Detailed Explanation
An endangered species is a species that faces a very high risk of extinction in the wild. Its population may have declined significantly because of threats such as habitat destruction, overexploitation, poaching, pollution, climate change, or other environmental pressures.
The term endangered is used in the IUCN Red List categories to describe a species at a serious risk of extinction. Conservation measures are important for such species to protect their remaining populations and habitats.
It is important to distinguish endangered species from extinct species. An endangered species still has living individuals, whereas an extinct species has no known surviving individuals anywhere on Earth.
Why is the answer correct?
A. Endangered is correct because an endangered species faces a very high risk of extinction in the wild and requires conservation attention.
Why are the other options wrong?
- B. Common ❌
A common species has a relatively widespread or abundant population and is not defined by a high risk of extinction. - C. Invasive ❌
An invasive species is a non-native species that spreads and may cause harm to native species or ecosystems. - D. Domesticated ❌
A domesticated species has been brought under human control through processes such as selective breeding. Domestication does not describe extinction risk.
Real-Life Example : The lion-tailed macaque, found in the Western Ghats, is an endangered species. Habitat loss and fragmentation are among the important threats to its survival.
12. A species that no longer exists anywhere on Earth is called
Correct Answer: C. Extinct
Detailed Explanation
A species is considered extinct when there are no known living individuals of that species remaining anywhere on Earth. Extinction represents the complete loss of a species and is generally considered irreversible.
Species can become extinct due to various factors, including habitat destruction, overexploitation, poaching, invasive species, pollution, disease, climate change, and natural environmental changes. Human activities have significantly increased extinction pressures on many species.
Extinction is different from being endangered or vulnerable. Endangered and vulnerable species still have living populations, while an extinct species no longer survives.
Why is the answer correct?
C. Extinct is correct because the term specifically means that a species has completely disappeared and no longer exists anywhere on Earth.
Why are the other options wrong?
- A. Rare ❌
A rare species has a small or limited population, but living individuals still exist. - B. Endemic ❌
An endemic species is naturally restricted to a particular geographical region. Being endemic does not mean that the species is extinct. - D. Vulnerable ❌
A vulnerable species faces a risk of becoming endangered in the future but still has a surviving population.
Real-Life Example : The dodo is a well-known example of an extinct species. It disappeared from the island of Mauritius after severe human-related pressures and other factors.
13. Which method conserves species in their natural habitats?
Correct Answer: B. In-situ conservation
Detailed Explanation
In-situ conservation means the conservation of species in their natural habitats. Instead of removing organisms from their natural surroundings, this method protects the ecosystems and habitats where they naturally occur.
In-situ conservation allows species to continue their natural processes such as feeding, breeding, reproduction, migration, and interaction with other organisms. It is considered an important approach for conserving not only individual species but also their habitats and ecological relationships.
Common examples of in-situ conservation include national parks, wildlife sanctuaries, and biosphere reserves. These protected areas help safeguard wildlife, plants, and their natural ecosystems.
Why is the answer correct?
B. In-situ conservation is correct because “in-situ” means “in the original or natural place”. The species are protected within the habitats where they naturally occur.
Why are the other options wrong?
- A. Ex-situ conservation ❌
Ex-situ conservation protects organisms outside their natural habitats, such as in zoos, botanical gardens, seed banks, and gene banks. - C. Artificial selection ❌
Artificial selection involves humans selecting organisms with desirable characteristics for breeding. It is not a method of conserving species in their natural habitats. - D. Laboratory culture ❌
Laboratory culture involves growing or maintaining organisms under controlled conditions. It is an example of conservation outside the natural habitat when used for conservation purposes.
Real-Life Example : National parks protect wildlife within their natural ecosystems. For example, animals in a national park can live and reproduce within their natural habitat under protection.
14. Which of the following is an example of ex-situ conservation?
Correct Answer: C. Seed bank
Detailed Explanation
Ex-situ conservation means the conservation of species or their genetic material outside their natural habitats. It is useful when species or genetic resources need to be protected under controlled conditions.
Ex-situ methods include seed banks, gene banks, botanical gardens, zoos, and tissue culture facilities. These methods can help preserve genetic material and support the recovery or reintroduction of species when necessary.
A seed bank stores seeds under suitable conditions so that their genetic material remains viable for future use. This is particularly useful for conserving plant diversity and agricultural crop varieties.
Why is the answer correct?
C. Seed bank is correct because seeds are collected and preserved outside their natural habitats under controlled storage conditions. Therefore, it is an example of ex-situ conservation.
Why are the other options wrong?
- A. National park ❌
A national park protects species within their natural ecosystems and is therefore an example of in-situ conservation. - B. Wildlife sanctuary ❌
Wildlife sanctuaries protect animals and their habitats in their natural environment, making them an in-situ conservation method. - D. Biosphere reserve ❌
Biosphere reserves conserve biodiversity within natural ecosystems and are associated with in-situ conservation.
Real-Life Example : A seed bank can preserve seeds of different crop varieties for long-term conservation. These seeds can potentially be used for research, breeding, or restoration in the future.
15. Which protected area category is primarily intended for the protection of wildlife and its habitat?
Correct Answer: A. Wildlife Sanctuary
Detailed Explanation
A wildlife sanctuary is a protected area established primarily for the conservation and protection of wildlife and their habitats. It provides a safe environment where animals, birds, plants, and other organisms can survive with reduced human disturbance.
Wildlife sanctuaries are important for protecting species from threats such as habitat destruction, hunting, poaching, and other human pressures. They also help conserve the ecosystems on which wildlife depends.
India has many wildlife sanctuaries that protect different types of habitats, including forests, wetlands, grasslands, and coastal ecosystems.
Why is the answer correct?
A. Wildlife Sanctuary is correct because its primary purpose is the protection and conservation of wildlife and their habitats.
Why are the other options wrong?
- B. Botanical Garden ❌
A botanical garden is mainly used for the collection, cultivation, conservation, and study of plants, generally outside their natural habitats. - C. Seed Bank ❌
A seed bank preserves seeds and genetic material under controlled conditions. It is an ex-situ conservation facility. - D. Zoological Museum ❌
A zoological museum is mainly concerned with the study, display, and preservation of zoological specimens. It is not a protected area for living wildlife and natural habitats.
Real-Life Example : Vedanthangal Bird Sanctuary in Tamil Nadu provides a protected habitat for many waterbirds and is an important site for bird conservation.
16. Which of the following is an example of a National Park in Tamil Nadu?
Correct Answer: A. Guindy National Park
Detailed Explanation
Tamil Nadu has several important protected areas that conserve its rich biodiversity. Guindy National Park is a national park located in Chennai and is notable for protecting natural vegetation and wildlife within an urban environment.
The park supports species such as blackbuck, spotted deer, jackals, reptiles, and many species of birds. Its location within Chennai makes it particularly significant as an example of an important natural area surrounded by a highly urbanised environment.
The other options in the question are protected areas in Tamil Nadu, but they belong to categories other than national parks.
Why is the answer correct?
A. Guindy National Park is correct because it is officially classified as a National Park in Tamil Nadu.
Why are the other options wrong?
- B. Point Calimere Wildlife Sanctuary ❌
It is a wildlife sanctuary and is known for its coastal, wetland, and wildlife habitats. - C. Sathyamangalam Wildlife Sanctuary ❌
It is a wildlife sanctuary in Tamil Nadu and forms an important wildlife habitat in the Eastern and Western Ghats landscape. - D. Vedanthangal Bird Sanctuary ❌
It is a bird sanctuary, established primarily for the protection of waterbirds and their habitat.
Real-Life Example : Guindy National Park is a notable example of wildlife conservation within a major city, making it an important natural space in Chennai.
17. Which biosphere reserve is associated with the Western Ghats of Tamil Nadu?
Correct Answer: A. Nilgiri Biosphere Reserve
Detailed Explanation
The Nilgiri Biosphere Reserve is an important biosphere reserve located in the Western Ghats. It extends across parts of Tamil Nadu, Kerala, and Karnataka and contains a wide range of forest ecosystems and rich biodiversity.
The reserve includes areas around the Nilgiri Hills and adjoining Western Ghats landscapes. It provides habitat for numerous species of plants and animals, including several threatened and endemic species.
Biosphere reserves aim to conserve biodiversity while also supporting research, education, and sustainable use of natural resources. The Nilgiri Biosphere Reserve is particularly important because the Western Ghats is a globally significant region for biodiversity.
Why is the answer correct?
A. Nilgiri Biosphere Reserve is correct because it is located in the Western Ghats region and includes important areas of the Western Ghats in Tamil Nadu.
Why are the other options wrong?
- B. Gulf of Mannar Biosphere Reserve ❌
It is associated with the Gulf of Mannar marine and coastal ecosystem along the southeastern coast of Tamil Nadu, not the Western Ghats. - C. Sundarbans Biosphere Reserve ❌
It is located in the Sundarbans region of West Bengal, known particularly for its mangrove ecosystem. - D. Nanda Devi Biosphere Reserve ❌
It is located in Uttarakhand in the Himalayan region and is not associated with the Western Ghats.
Real-Life Example : The Nilgiri Biosphere Reserve supports diverse habitats and wildlife, including species such as the Nilgiri tahr, lion-tailed macaque, and Nilgiri langur, making it an important area for biodiversity conservation.
18. Which of the following is a marine protected area associated with Tamil Nadu?
Correct Answer: B. Gulf of Mannar Marine Biosphere Reserve
Detailed Explanation
The Gulf of Mannar Marine Biosphere Reserve is an important marine conservation area located along the southeastern coast of Tamil Nadu. It covers a rich coastal and marine ecosystem extending between Rameswaram and Tuticorin (Thoothukudi).
The region is well known for its coral reefs, seagrass beds, mangroves, sandy shores, and marine species. It supports a wide variety of marine organisms, including fish, sea turtles, dolphins, dugongs, corals, and many other forms of marine life.
Marine protected areas are important because marine ecosystems face threats such as overfishing, pollution, habitat destruction, and unsustainable resource use. Protecting these areas helps conserve marine biodiversity and maintain ecological functions.
Why is the answer correct?
B. Gulf of Mannar Marine Biosphere Reserve is correct because it is a major marine conservation area associated with the coastal waters of Tamil Nadu and protects important marine and coastal biodiversity.
Why are the other options wrong?
- A. Mudumalai Tiger Reserve ❌
It is a protected forest and tiger habitat located in the Nilgiri region of Tamil Nadu. It is a terrestrial protected area, not a marine area. - C. Sathyamangalam Tiger Reserve ❌
It is a terrestrial forest ecosystem in the Erode region and forms an important wildlife corridor between the Western and Eastern Ghats. - D. Kalakkad-Mundanthurai Tiger Reserve ❌
It is a forest and tiger reserve located in the southern Western Ghats of Tamil Nadu. It is not a marine protected area.
Real-Life Example : The Gulf of Mannar provides important habitat for the dugong, a marine mammal that depends heavily on seagrass ecosystems. Conservation efforts in the region help protect such threatened marine species.
19. Which of the following is a major objective of forest conservation?
Correct Answer: B. Protecting forest biodiversity and ecological functions
Detailed Explanation
Forest conservation aims to protect, maintain, and sustainably manage forest ecosystems so that they can continue to support biodiversity and provide important ecological services.
Forests provide habitats for a large number of plants, animals, birds, insects, and microorganisms. They also perform important ecological functions such as carbon storage, oxygen production, soil protection, water regulation, nutrient cycling, and climate regulation.
Forest conservation therefore focuses on preventing activities that cause unnecessary loss and degradation of forests. It also promotes measures such as sustainable forest management, afforestation, reforestation, prevention of illegal logging, and protection of wildlife habitats.
Protecting forests is not only about increasing the number of trees. It is also about maintaining the health, biodiversity, structure, and ecological functions of the entire forest ecosystem.
Why is the answer correct?
B. Protecting forest biodiversity and ecological functions is correct because forest conservation seeks to maintain forests as healthy ecosystems and protect the organisms and ecological processes that depend on them.
Why are the other options wrong?
- A. Increasing habitat fragmentation ❌
Habitat fragmentation breaks continuous forests into smaller, isolated patches. It can negatively affect wildlife movement and biodiversity and is therefore a threat rather than a conservation objective. - C. Increasing uncontrolled exploitation ❌
Uncontrolled extraction of timber and other forest resources can lead to forest degradation and biodiversity loss. Conservation promotes sustainable use instead. - D. Replacing natural forests with built-up areas ❌
Converting natural forests into urban or built-up areas causes habitat loss and reduces biodiversity. It is contrary to the objective of forest conservation.
Real-Life Example : Protecting a forest from illegal logging and uncontrolled clearing helps maintain wildlife habitats, reduce soil erosion, conserve water resources, and preserve biodiversity.
20. Which of the following is an example of in-situ conservation?
Correct Answer: C. National Park
Detailed Explanation
In-situ conservation means protecting and conserving organisms within their natural habitats. Instead of removing species from their natural environment, their habitats and the ecosystems in which they naturally occur are protected.
National parks are important examples of in-situ conservation because they protect wildlife, plants, habitats, and ecological processes within natural ecosystems. They allow organisms to continue their natural activities such as feeding, breeding, reproduction, and interaction with other species.
Other protected areas such as wildlife sanctuaries and biosphere reserves also contribute to in-situ conservation. In contrast, ex-situ conservation protects organisms or their genetic material outside their natural habitats.
Why is the answer correct?
C. National Park is correct because a national park protects species within their natural habitat, making it an example of in-situ conservation.
Why are the other options wrong?
- A. Zoo ❌
Zoos maintain and conserve animals outside their natural habitats, so they are examples of ex-situ conservation. - B. Seed bank ❌
Seed banks preserve plant seeds outside their natural habitats under controlled conditions. They are an example of ex-situ conservation. - D. Botanical garden ❌
Botanical gardens maintain and cultivate plants outside their natural habitats and are therefore associated with ex-situ conservation.
Real-Life Example : Guindy National Park in Chennai protects wildlife and vegetation within a natural habitat. This makes it an example of in-situ conservation.
Further Reference – Environment and Ecology
To Know More About “Environment and Ecology” Topics For further reading and concept clarity, learners can refer to the NCERT textbooks, which provide useful foundational information on environment, ecology, ecosystems, and related topics. This official NCERT resource “Our Environment” can be used alongside the explanations in this quiz for deeper understanding and revision.
