Environment And Ecology: Previous Year Questions

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| By Tanmay Shankar
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Tanmay Shankar
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  • 1/46 Questions

    With reference to the food chains in ecosystems, which of the following kinds of organism is / are known as decomposer organism/organisms? 1. Virus2. Fungi3. BacteriaSelect the correct answer using the codes given below.

    • 1 only
    • 2 and 3 only
    • 1 and 3 only
    • 1, 2 and 3
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About This Quiz

Environment is the immediate surrounding of living organisms while ecology is the study of living organisms in their environments. The Environment and Ecology quiz below assesses these two topics as one. See how much you know.

Environment And Ecology: Previous Year Questions - Quiz

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  • 2. 

    Acid rain is caused by the pollution of environment by

    • Carbon dioxide and nitrogen

    • Carbon monoxide and carbon dioxide

    • Ozone and carbon dioxide

    • Nitrous oxide and sulphur dioxide

    Correct Answer
    A. Nitrous oxide and sulphur dioxide
    Explanation
    Acid rain is caused by the pollution of the environment by nitrous oxide and sulphur dioxide. When these gases are released into the atmosphere from sources such as industrial emissions and vehicle exhaust, they react with water, oxygen, and other chemicals to form acidic compounds. These compounds then fall to the Earth as acid rain, which can have harmful effects on plants, animals, and infrastructure. Nitrous oxide and sulphur dioxide are particularly responsible for the acidity of acid rain due to their ability to form strong acids when combined with water.

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  • 3. 

    With reference to food chains in ecosystems, consider the following statements: 1. A food chain illustrates the order in which a chain of organisms feed upon each other.2. Food chains are found within the populations of a species.3. A food chain illustrates the numbers of each organism which are eaten by others.Which of the statements given above is / are correct?

    • 1 only

    • 1 and 2 only

    • 1, 2 and 3

    • None

    Correct Answer
    A. 1 only
    Explanation
    A food chain illustrates the order in which a chain of organisms feed upon each other. This means that statement 1 is correct. However, statement 2 is incorrect because food chains are not found within the populations of a species, but rather they involve multiple species. Statement 3 is also incorrect because a food chain does not illustrate the numbers of each organism that are eaten by others, but rather the sequence of feeding relationships. Therefore, the correct answer is 1 only.

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  • 4. 

    Which one of the following terms describes not only the physical space occupied by an organism, but also its functional role in the community of organisms?

    • Ecotone

    • Ecological niche

    • Habitat

    • Home range

    Correct Answer
    A. Ecological niche
    Explanation
    Ecological niche refers to the specific role and position of an organism within its ecosystem. It encompasses not only the physical space occupied by the organism (habitat), but also its interactions with other organisms and its utilization of resources. The ecological niche includes the organism's feeding habits, behavior, and adaptations, which allow it to survive and reproduce in its environment. Therefore, ecological niche is the term that describes both the physical space and the functional role of an organism in the community of organisms.

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  • 5. 

    Which of the following is/are unique characteristic/characteristics of equatorial forests? 1. Presence of tall, closely set trees with crowns forming a continuous canopy2. Coexistence of a large number of species3. Presence of numerous varieties of epiphytesSelect the correct answer using the code given below:

    • 1 only

    • 2 and 3 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1, 2 and 3
    Explanation
    Equatorial forests have three unique characteristics. Firstly, they have tall, closely set trees with crowns that form a continuous canopy. This dense canopy provides shade and prevents sunlight from reaching the forest floor. Secondly, equatorial forests are known for the coexistence of a large number of species. The high biodiversity in these forests is a result of the favorable climate and abundant resources. Lastly, equatorial forests have numerous varieties of epiphytes, which are plants that grow on other plants for support but do not take nutrients from them. These unique characteristics make equatorial forests rich and diverse ecosystems.

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  • 6. 

    Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss? 1. Hard and waxy leaves2. Tiny leaves or no leaves3. Thorns instead of leavesSelect the correct answer using the codes given below.

    • 1 and 2 only

    • 2 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1, 2 and 3
    Explanation
    In desert areas, plants have to adapt to the arid conditions and minimize water loss. One way they do this is by having hard and waxy leaves (1), which helps to reduce transpiration. Another adaptation is having tiny leaves or no leaves (2), which reduces the surface area for water loss. Finally, some plants in desert areas have thorns instead of leaves (3), which helps to protect the plant from herbivores and also reduces water loss. Therefore, the correct answer is 1, 2, and 3.

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  • 7. 

    Consider the following protected areas:1. Bandipur2. Bhitarkanika3. Manas4. SunderbanWhich of the above are declared Tiger Reserves?

    • 1 and 2 only

    • 1, 3 and 4 only

    • 2, 3 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 3 and 4 only
    Explanation
    Bandipur, Manas, and Sunderban are declared Tiger Reserves. Bhitarkanika is not declared as a Tiger Reserve.

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  • 8. 

    Which one of the following groups of animals belongs to the category of endangered species?

    • Great Indian Bustard, Musk Deer, Red Panda and Asiatic Wild Ass

    • Kashmir Stag, Cheetal, Blue Bull and Great Indian Bustard

    • Snow Leopard, Swamp Deer, Rhesus Monkey, and Saras (Crane)

    • Lion-tailed Macaque, Blue Bull, Hanuman Langur and Cheetal

    Correct Answer
    A. Great Indian Bustard, Musk Deer, Red Panda and Asiatic Wild Ass
    Explanation
    The animals mentioned in the answer option, Great Indian Bustard, Musk Deer, Red Panda, and Asiatic Wild Ass, all belong to the category of endangered species. This means that their population is at a high risk of extinction in the wild. Conservation efforts are necessary to protect and preserve these species and prevent their decline.

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  • 9. 

    Which of the following can be threats to the biodiversity of a geographical area?1. Global warming2. Fragmentation of habitat3. Invasion of alien species4. Promotion of vegetarianismSelect the correct answer using the codes given below:

    • 1, 2 and 3 only

    • 2 and 3 only

    • 1 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2 and 3 only
    Explanation
    Global warming, fragmentation of habitat, and invasion of alien species can all be threats to the biodiversity of a geographical area. Global warming can lead to changes in temperature and precipitation patterns, which can disrupt ecosystems and cause species to migrate or become extinct. Fragmentation of habitat, such as through deforestation or urbanization, can result in the loss of habitat and isolation of populations, making it difficult for species to survive and reproduce. Invasion of alien species, also known as invasive species, can outcompete native species for resources and disrupt the balance of an ecosystem. Promotion of vegetarianism, while beneficial for reducing greenhouse gas emissions, is not directly related to threats to biodiversity.

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  • 10. 

    Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to

    • The destruction of their nesting sites by new invasive species

    • A drug used by cattle owners for treating their diseased cattle

    • Scarcity of food available to them

    • A widespread, persistent and fatal disease among them

    Correct Answer
    A. A drug used by cattle owners for treating their diseased cattle
    Explanation
    The correct answer is a drug used by cattle owners for treating their diseased cattle. This is because the drug used by cattle owners for treating their diseased cattle contains a chemical called diclofenac, which is toxic to vultures. When vultures feed on the carcasses of cattle treated with this drug, they ingest the diclofenac and it causes kidney failure in the vultures, leading to their decline in numbers.

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  • 11. 

    Which one of the following is not a site for in-situ method of conservation of flora?

    • Biosphere Reserve

    • Botanical Garden

    • National Park

    • Wildlife Sanctuary

    Correct Answer
    A. Botanical Garden
    Explanation
    Botanical Gardens are not considered a site for in-situ conservation of flora because they primarily focus on the cultivation and display of plants for educational and recreational purposes. In contrast, in-situ conservation aims to protect and preserve plant species in their natural habitats. Biosphere Reserves, National Parks, and Wildlife Sanctuaries are examples of sites where in-situ conservation methods are implemented to safeguard the biodiversity and habitats of various plant species.

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  • 12. 

    Biodiversity forms the basis for human existence in the following ways:1. Soil formation2. Prevention of soil erosion3. Recycling of waste4. Pollination of cropsSelect the correct answer using the codes given below:

    • 1, 2 and 3 only

    • 2, 3 and 4 only

    • 1 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2, 3 and 4
    Explanation
    Biodiversity forms the basis for human existence in multiple ways. Firstly, it contributes to soil formation by providing organic matter through the decomposition of plants and animals. Secondly, it helps prevent soil erosion by stabilizing the soil with the roots of various plants. Thirdly, biodiversity plays a crucial role in the recycling of waste by breaking down organic matter and returning nutrients to the ecosystem. Lastly, biodiversity is essential for crop pollination, as many plants rely on insects and other animals for the transfer of pollen. Therefore, all the given options (1, 2, 3, and 4) are correct explanations for how biodiversity supports human existence.

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  • 13. 

    Recently, "oil zapper" was in the news. What is it?

    • It is an eco-friendly technology for the remediation of oily sludge and oil spills

    • It is the latest technology developed for under-sea oil exploration

    • It is a genetically engineered high bio fuel-yielding maize variety

    • It is the latest technology to control the accidentally caused flames from oil wells

    Correct Answer
    A. It is an eco-friendly technology for the remediation of oily sludge and oil spills
    Explanation
    The correct answer is "It is an eco-friendly technology for the remediation of oily sludge and oil spills." This means that the "oil zapper" is a technology that is used to clean up and remove oil spills and oily sludge in an environmentally friendly way. It is likely a method or device that breaks down or removes the oil from the affected area without causing harm to the environment.

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  • 14. 

    Which of the following can be found as pollutants in the drinking water in some parts of India? 1. Arsenic2. Sorbitol3. Fluoride4. Formaldehyde5. UraniumSelect the correct answer using the codes given below.

    • 1 and 3 only

    • 2, 4 and 5 only

    • 1, 3 and 5 only

    • 1, 2, 3, 4 and 5

    Correct Answer
    A. 1 and 3 only
    Explanation
    Arsenic and fluoride are known to be pollutants that can be found in drinking water in some parts of India. Sorbitol, formaldehyde, and uranium are not specifically mentioned as pollutants in this context. Therefore, the correct answer is 1 and 3 only.

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  • 15. 

    In which of the following States is lion-tailed macaque found in its natural habitat? 1. Tamil Nadu2. Kerala3. Karnataka4. Andhra PradeshSelect the correct answer using the codes given below

    • 1, 2 and 3 only

    • 2 only

    • 1, 3 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2 and 3 only
    Explanation
    The lion-tailed macaque is found in its natural habitat in Tamil Nadu, Kerala, and Karnataka. This is indicated by the correct answer choice "1, 2 and 3 only". Andhra Pradesh is not mentioned as a state where the lion-tailed macaque is found.

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  • 16. 

    Photochemical smog is a resultant of the reaction among

    • NO2, 03 and peroxyacetyl nitrate in the presence of sunlight

    • CO, 02 and peroxyacetyl nitrate in the presence of sunlight

    • CO, CO2 and N02 at low temperature

    • High concentration of N02, O3 and CO in the evening

    Correct Answer
    A. NO2, 03 and peroxyacetyl nitrate in the presence of sunlight
    Explanation
    Photochemical smog is formed when NO2, O3, and peroxyacetyl nitrate react with each other in the presence of sunlight. These reactions occur in the atmosphere and result in the formation of various pollutants, such as nitrogen dioxide, ozone, and peroxyacetyl nitrate. Sunlight provides the energy needed for these reactions to take place. The combination of these pollutants leads to the formation of photochemical smog, which is a type of air pollution characterized by a yellowish-brown haze and the presence of harmful chemicals.

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  • 17. 

    Consider the following fauna of India:1.Gharial2.Leatherback turtle3.Swamp deerWhich of the above is/are endangered?

    • 1 and 2 only

    • 3 only

    • 1, 2 and 3

    • None

    Correct Answer
    A. 1, 2 and 3
    Explanation
    All three species mentioned in the list, namely Gharial, Leatherback turtle, and Swamp deer, are endangered. The term "endangered" refers to a species that is at risk of becoming extinct in the near future. These species face various threats such as habitat loss, pollution, hunting, and climate change. Efforts are being made to conserve and protect these species to prevent their extinction.

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  • 18. 

    The National Green Tribunal Act, 2010 was enacted in consonance with which of the following provisions of the constitution of India?1. Right to healthy environment, construed as a part of Right to life under Article 212. Provision of grants for raising the level of administration in the Scheduled Tribes under Article 275(1).3. Power and functions of Gram Sabha as mentioned under Article 243 (A)Select the correct answer using the codes given below:

    • 1 only

    • 2 and 3 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1 only
    Explanation
    The National Green Tribunal Act, 2010 was enacted in consonance with the provision of the constitution of India that recognizes the right to a healthy environment as a part of the Right to life under Article 21. This means that individuals have the right to live in a clean and pollution-free environment. The Act was enacted to provide a specialized forum for the effective and expeditious disposal of cases relating to environmental protection and conservation. It aims to ensure the enforcement of environmental laws and promote sustainable development. Therefore, the correct answer is 1 only.

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  • 19. 

    What is the difference between the antelopes Oryx and Chiru?

    • Oryx is adapted to live in hot and arid areas whereas Chiru is adapted to live in steppes and semidesert areas of cold high mountains

    • Oryx is poached for its antlers whereas Chiru is poached for its musk

    • Oryx exists in western India only whereas Chiru exists in north-east India only

    • None of the statements (a), (b) and (c) given above is correct

    Correct Answer
    A. Oryx is adapted to live in hot and arid areas whereas Chiru is adapted to live in steppes and semidesert areas of cold high mountains
    Explanation
    The difference between the antelopes Oryx and Chiru is that Oryx is adapted to live in hot and arid areas, while Chiru is adapted to live in steppes and semidesert areas of cold high mountains. This means that Oryx can withstand high temperatures and dry conditions, while Chiru is able to survive in colder climates with less vegetation.

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  • 20. 

    What would happen if phytoplankton of an ocean is completely destroyed for some reason?1. The ocean as a carbon sink would be adversely affected.2. The food chains in the ocean would be adversely affected.3. The density of ocean water would drastically decrease.Select the correct answer using the codes given below:

    • 1 and 2 only

    • 2 only

    • 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1 and 2 only
    Explanation
    If phytoplankton in an ocean is completely destroyed, it would have adverse effects on the ocean as a carbon sink. Phytoplankton plays a crucial role in absorbing carbon dioxide from the atmosphere through photosynthesis, thus reducing the levels of this greenhouse gas in the atmosphere. Without phytoplankton, the ocean's ability to absorb and store carbon dioxide would be significantly reduced. Additionally, phytoplankton forms the base of the ocean food chains, so their absence would disrupt the entire food web, negatively impacting the entire ecosystem. Therefore, options 1 and 2 are correct. Option 3 is incorrect as the density of ocean water would not be drastically affected by the absence of phytoplankton.

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  • 21. 

    Consider the following:-1. Carbon dioxide2. Oxides of Nitrogen3. Oxides of SulphurWhich of the above is/are the emission/emissions from coal combustion at thermal power plants?

    • 1 only

    • 2 and 3 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1, 2 and 3
    Explanation
    Carbon dioxide, oxides of nitrogen, and oxides of sulfur are all emissions from coal combustion at thermal power plants.

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  • 22. 

    Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?

    • Ocean, lakes, grasslands, mangroves

    • Mangroves, ocean, grasslands, lakes

    • Mangroves, grasslands, lakes, ocean

    • Ocean, mangroves, lakes, grasslands

    Correct Answer
    A. Mangroves, grasslands, lakes, ocean
  • 23. 

    In which one among the following categories of protected areas in India are local people not allowed to collect and use the biomass?

    • Biosphere Reserves

    • National Parks

    • Wetlands declared under Ramsar Convention

    • Wildlife Sanctuaries

    Correct Answer
    A. National Parks
    Explanation
    In National Parks, local people are not allowed to collect and use the biomass. National Parks in India are designated areas for the conservation and protection of wildlife and their habitats. They are strictly regulated to ensure the preservation of the ecosystem and its biodiversity. Therefore, activities such as collecting and using biomass are restricted in order to maintain the natural balance and prevent any disturbance to the wildlife and their habitats.

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  • 24. 

    Three of the following criteria have contributed to the recognition of Western Ghats-Sri Lanka and Indo-Burma regions as hotspots of biodiversity:1. Species richness2. Vegetation density3. Endemism.4. Ethno-botanical importance5. Threat perception6. Adaptation of flora and fauna to warm arid humid conditionsWhich three of the above are correct criteria in this context?

    • 1,2 and 6

    • 2,4 and 6

    • 1,3 and 5

    • 3,4 and 6

    Correct Answer
    A. 1,3 and 5
    Explanation
    The correct criteria in this context are species richness, endemism, and threat perception. Species richness refers to the number of different species present in an area, indicating the overall biodiversity. Endemism refers to the presence of species that are unique to a particular area, indicating high levels of biodiversity and ecological importance. Threat perception refers to the level of threat or vulnerability faced by the biodiversity in these regions, highlighting the need for conservation efforts. Ethno-botanical importance, vegetation density, and adaptation to warm arid humid conditions are not mentioned as criteria contributing to the recognition of these regions as hotspots of biodiversity.

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  • 25. 

    If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because

    • The soil of rain forest is deficient in nutrients

    • Propagules of the trees in a rain forest have poor viability

    • The rain forest species are slow- growing

    • Exotic species invade the fertile soil of rain forest

    Correct Answer
    A. The soil of rain forest is deficient in nutrients
    Explanation
    The correct answer is that the soil of a rain forest is deficient in nutrients. This is because rain forests have a high rate of decomposition, which rapidly recycles nutrients back into the ecosystem. When the forest is removed, the nutrients are quickly leached from the soil by heavy rainfall, leaving it depleted and unable to support new growth. Additionally, rain forests typically have a thin layer of topsoil, which further limits the availability of nutrients for regeneration.

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  • 26. 

    A sandy and saline area is the natural habitat of an Indian animal species. The animal has no predators in that area but its existence is threatened due to the destruction of its habitat. Which one of the following could be that animal?

    • Indian wild buffalo

    • Indian wild ass

    • Indian wild boar

    • Indian gazelle

    Correct Answer
    A. Indian wild ass
    Explanation
    The Indian wild ass could be the correct answer because it is known to inhabit sandy and saline areas. The fact that it has no predators in that area suggests that it is well-adapted to the environment and its population is not naturally controlled by predation. However, the destruction of its habitat poses a threat to its existence, indicating that it heavily relies on the specific conditions of its habitat for survival.

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  • 27. 

    The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?

    • The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture out

    • The mangroves provide both food and medicines which people are in need of after any natural disaster

    • The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami

    • The mangrove trees do not get uprooted by storms and tides because of their extensive roots

    Correct Answer
    A. The mangrove trees do not get uprooted by storms and tides because of their extensive roots
    Explanation
    Mangrove trees have extensive roots that anchor them firmly in the ground, making them resistant to being uprooted by storms and tides. This allows them to act as a safety hedge against coastal calamities such as cyclones and tsunamis. The strong roots of mangroves help to dissipate the force of waves and provide a barrier that protects human settlements from the destructive power of the sea. Therefore, mangroves serve as a reliable safety hedge by preventing the sea from reaching human settlements and reducing the impact of coastal disasters.

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  • 28. 

    Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of1. Its escape into the outer strato-sphere.2. The photosynthesis by phyto-plankton in the oceans3. The trapping of air in the polar ice capsWhich of the statements given above is/are correct?

    • 1 and 2

    • 2 only

    • 2 and 3 only

    • 3 only

    Correct Answer
    A. 2 and 3 only
    Explanation
    The correct answer is 2 and 3 only. Statement 1 is incorrect because carbon dioxide does not escape into the outer stratosphere. Statement 2 is correct because phytoplankton in the oceans do undergo photosynthesis and absorb carbon dioxide. Statement 3 is correct because air can be trapped in the polar ice caps, but it does not directly affect the concentration of carbon dioxide in the atmosphere.

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  • 29. 

    The Himalayan Range is very rich in species diversity. Which one among the following is the most appropriate reason for this Phenomenon?

    • It has a high rainfall that supports luxuriant vegetative growth

    • It is a confluence of different bio-geographical zones

    • Exotic and invasive species have riot been introduced in this region

    • It has less human interference

    Correct Answer
    A. It is a confluence of different bio-geographical zones
    Explanation
    The Himalayan Range is very rich in species diversity because it is a confluence of different bio-geographical zones. This means that the range encompasses a variety of different habitats and ecosystems, each supporting its own unique set of species. The convergence of these different zones creates a high level of biodiversity, as species from each zone mix and interact with one another. This allows for a wide range of species to coexist and thrive in the Himalayas.

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  • 30. 

    The "Red Data Books" published by the International Union for Conservation of Nature and Natural Resources (IUCN) contain lists of1. Endemic plant and animal species present in the biodiversity hotspots.2. Threatened plant and animal species.3. Protected sites for conservation of nature and natural resources. In various countries.Select the correct answer using the codes given below:

    • 1 and 3

    • 2 only

    • 2 and 3

    • 3 only

    Correct Answer
    A. 2 only
    Explanation
    The correct answer is "2 only". The "Red Data Books" published by the IUCN contain lists of threatened plant and animal species. These books serve as a comprehensive assessment of the conservation status of species globally and provide crucial information for conservation efforts. The books do not specifically focus on endemic species or protected sites for conservation.

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  • 31. 

    Consider the following kinds of organisms:1. Bacteria2. Fungi3. Flowering PlantsSome species of which of the above kinds of organisms are employed as biopesticides?

    • 1 only

    • 2 and 3 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1, 2 and 3
    Explanation
    Bacteria, fungi, and flowering plants can all be employed as biopesticides. Bacteria such as Bacillus thuringiensis produce toxins that target specific pests, while certain fungi like Beauveria bassiana can infect and kill insects. Flowering plants, on the other hand, can be genetically modified to produce insecticidal proteins. Therefore, all three kinds of organisms can be used as biopesticides.

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  • 32. 

    With reference to India, consider the following Central Acts:1. Import and Export (Control) Act, 19472. Mining and Mineral Development (Regulation) Act, 19573. Customs Act, 19624. Indian Forest Act, 1927Which of the above Acts have relevance to/bearing on the biodiversity conservation in the country?

    • 1 and 3 only

    • 2, 3 and 4 only

    • 1, 2, 3 and 4

    • None of the above Acts

    Correct Answer
    A. 1, 2, 3 and 4
    Explanation
    All of the mentioned Central Acts have relevance to/bearing on the biodiversity conservation in India. The Import and Export (Control) Act, 1947 regulates the import and export of goods, including wildlife and plant species, to prevent the illegal trade of endangered species. The Mining and Mineral Development (Regulation) Act, 1957 includes provisions for the protection and conservation of the environment, including biodiversity, during mining activities. The Customs Act, 1962 allows for the regulation and control of the import and export of goods, including wildlife and plant species. The Indian Forest Act, 1927 provides for the conservation and management of forests, which are important habitats for biodiversity.

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  • 33. 

    There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon?1. Discharge of nutrients from the estuaries.2. Run-off from the land during the monsoon.3. Upwelling in the seas.Select the correct answer from the codes given below:

    • 1 only

    • 1 and 2 only

    • 2 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1 and 2 only
    Explanation
    The increase in harmful algal blooms in the seawaters of India can be attributed to two main causative factors. Firstly, the discharge of nutrients from the estuaries contributes to the growth of these blooms. Estuaries act as a source of nutrients, such as nitrogen and phosphorus, which promote the growth of algae. Secondly, run-off from the land during the monsoon also plays a role. The heavy rainfall during the monsoon season washes nutrients from the land into the seawater, providing additional fuel for algal blooms. Therefore, the correct answer is 1 and 2 only.

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  • 34. 

    Consider the following animals:1. Sea cow2. Sea horse3. Sea lionWhich of the above is/are mammal/mammals?

    • 1 only

    • 1 and 3 only

    • 2 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1 and 3 only
    Explanation
    Sea cows and sea lions are mammals because they both give birth to live young and nurse them with milk. Sea horses, on the other hand, are not mammals. They are fish and reproduce by laying eggs. Therefore, the correct answer is 1 and 3 only.

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  • 35. 

    How does National Biodiversity Authority (NBA) help in protecting the Indian agriculture?1. NBA checks the biopiracy and protects the indigenous and traditional genetic resources.2. NBA directly monitors and supervises the scientific research on genetic modification of crop plants.3. Application for Intellectual Property Rights related to genetic/biological resources cannot be made without the approval of NBA.Which of the statements given above is/are correct?

    • 1 only

    • 2 and 3 only

    • 1 and 3 only

    • 1, 2 and 3

    Correct Answer
    A. 1 and 3 only
    Explanation
    The National Biodiversity Authority (NBA) helps in protecting Indian agriculture by checking biopiracy and protecting indigenous and traditional genetic resources. This ensures that the genetic resources of crops are not exploited without proper authorization. Additionally, the NBA plays a role in protecting the intellectual property rights related to genetic/biological resources by requiring approval for any application for such rights. Therefore, statements 1 and 3 are correct. Statement 2 is incorrect as the NBA does not directly monitor and supervise scientific research on genetic modification of crop plants.

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  • 36. 

    Consider the following:1. Black-necked crane2. Cheetah3. Flying squirrel4. Snow leopardWhich of the above are naturally found in India?

    • 1, 2 and 3 only

    • 1, 3 and 4 only

    • 2 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 3 and 4 only
    Explanation
    The correct answer is 1, 3 and 4 only. The black-necked crane, flying squirrel, and snow leopard are naturally found in India. The cheetah, however, is not naturally found in India.

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  • 37. 

    Consider the following1. Star tortoise2. Monitor lizard3. Pygmy hog4. Spider monkeyWhich of the above found in India?

    • 1, 2 and 3 only

    • 2 and 3 only

    • 1 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2 and 3 only
    Explanation
    The star tortoise, monitor lizard, and pygmy hog are the only animals found in India out of the given options. The spider monkey is not found in India.

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  • 38. 

    The acidification of ocean is increasing. Why is this phenomenon a cause of concern?1. The growth and survival of calcareous phytoplankton will be adversely affected.2. The growth and survival of coral reefs will be adversely affected.3. The survival of some animals that have phytoplanktonic larvae will be adversely affected.4. The cloud seeding and formation of clouds will be adversely affected.Which of the statements given above is/are correct?

    • 1, 2 and 3 only

    • 2 only

    • 1 and 3 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2, 3 and 4
    Explanation
    The acidification of the ocean is a cause of concern because it adversely affects various aspects of marine life. Statement 1 is correct because calcareous phytoplankton, which play a vital role in the marine food chain, rely on calcium carbonate to build their shells and their growth and survival will be negatively impacted. Statement 2 is correct because coral reefs, which are important ecosystems and provide habitat for numerous marine species, are also made of calcium carbonate and will be adversely affected by acidification. Statement 3 is correct because the survival of animals with phytoplanktonic larvae, such as many fish species, will be affected as their food source is diminished. Statement 4 is correct because acidification can disrupt the process of cloud formation, impacting weather patterns and potentially leading to changes in climate.

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  • 39. 

    What are the reasons for the people's resistance to the introduction of BT brinjal in India?1. Bt brinjal has been created by inserting a gene from a soil fungus into its genome.2. The seeds of Bt brinjal are terminator seeds and therefore, the farmers have to buy the seeds before every season from the seed companies.3. There is an apprehension that the consumption of Bt brinjal may have adverse impact on health.4. There is some concern that the introduction of Bt brinjal may have adverse effect on the biodiversity.Select the correct answer using the codes given below:

    • 1, 2 and 3 only

    • 2 and 3 only

    • And 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 2 and 3 only
    Explanation
    The people's resistance to the introduction of BT brinjal in India is due to two main reasons. Firstly, BT brinjal is created by inserting a gene from a soil fungus into its genome, which raises concerns about the safety and potential adverse effects on health. Secondly, the seeds of BT brinjal are terminator seeds, meaning farmers have to buy new seeds before every season from seed companies, leading to increased dependency on these companies. Therefore, the correct answer is 2 and 3 only.

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  • 40. 

    The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?

    • Presence of prominent tropo-spheric turbulence; and inflow of chlorofluorocarbons

    • Presence of .prominent polar front and stratospheric': Clouds; and inflow of chlorofluorocarbons

    • Absence of polar front and stratospheric clouds; and inflow of methane and chlorofluorocarbons

    • Increased temperature at polar region due to global warming

    Correct Answer
    A. Presence of .prominent polar front and stratospheric': Clouds; and inflow of chlorofluorocarbons
    Explanation
    The formation of the ozone hole in the Antarctic region is primarily caused by the presence of prominent polar front and stratospheric clouds, as well as the inflow of chlorofluorocarbons (CFCs). The polar front and stratospheric clouds create conditions that promote the destruction of ozone molecules, while CFCs released into the atmosphere contribute to the depletion of ozone. This combination of factors leads to the formation of the ozone hole in the Antarctic region.

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  • 41. 

    Regarding "carbon credits", which one of the following statements is not correct?

    • The carbon credit system was ratified in conjunction with the Kyoto Protocol

    • Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota

    • The goal of the carbon credit system is to limit the increase of carbon dioxide emission

    • Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme

    Correct Answer
    A. Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme
    Explanation
    The correct answer is that carbon credits are not traded at a price fixed from time to time by the United Nations Environment Programme. The price of carbon credits is determined by the market and can fluctuate based on supply and demand. The United Nations Environment Programme does not set a fixed price for carbon credits.

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  • 42. 

    Other than resistance to pests, what are the prospects for which genetically engineered plants have been created?1. To enable them to withstand drought2. To increase the nutritive value of the produce3. To enable them to grow and do photosynthesis in spaceships and space stations4. To increase their shelf lifeSelect the correct answer using the codes given below:

    • 1 and 2 only

    • 3 and 4 only

    • 1, 2 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2, 3 and 4
    Explanation
    Genetically engineered plants have been created not only to resist pests but also for other purposes. One such purpose is to enable them to withstand drought, which is important for areas with limited water resources. Another purpose is to increase the nutritive value of the produce, making it more beneficial for human consumption. Additionally, genetically engineered plants have been developed to be able to grow and do photosynthesis in spaceships and space stations, which is crucial for long-duration space missions. Lastly, they have also been engineered to increase their shelf life, reducing food waste and increasing availability. Therefore, options 1, 2, 3, and 4 are all correct.

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  • 43. 

    In the grasslands, trees do not replace the grasses as a part of an ecological succession because of

    • insects and fungi

    • Limited sunlight and paucity of nutrients

    • Water limits and fire

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The statement "None of the above" suggests that the reasons mentioned in the options (insects and fungi, limited sunlight and paucity of nutrients, water limits and fire) are not the factors responsible for trees not replacing grasses in the grasslands as part of ecological succession. Therefore, there must be other reasons that prevent the replacement of grasses by trees in the grasslands, which are not mentioned in the given options.

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  • 44. 

    The Millennium Ecosystem Assessment describes the following major categories of ecosystem services-provisioning, supporting regulating, preserving and cultural which one of the following is supporting services?

    • Production of food and water

    • Control of climate and disease

    • Nutrient cycling and pollination

    • Maintenance of diversity

    Correct Answer
    A. Nutrient cycling and pollination
    Explanation
    The supporting services provided by ecosystems are those that enable other ecosystem services to exist. Nutrient cycling and pollination are examples of supporting services because they play a crucial role in maintaining the health and functioning of ecosystems. Nutrient cycling involves the recycling and distribution of essential nutrients within ecosystems, which is necessary for the growth and survival of plants and other organisms. Pollination, on the other hand, is the process by which pollen is transferred from male to female reproductive organs in plants, facilitating their reproduction and the production of fruits and seeds. Both nutrient cycling and pollination support the provisioning of food and other ecosystem services.

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  • 45. 

    Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning?1. Smelting Units2. Pens and pencils3. Hair oils and cosmeticsSelect the correct answer using the codes given below:

    • 1, 2 and 3 only

    • 1 and 3 only

    • 2 and 4 only

    • 1, 2, 3 and 4

    Correct Answer
    A. 1, 2, 3 and 4
    Explanation
    Lead, even after being banned from petrol, can still be found in various sources that can lead to lead poisoning. Smelting units, which involve the process of extracting metal from its ore, can release lead into the environment. Pens and pencils can contain lead in their ink or paint, which can be ingested or come into contact with the skin. Hair oils and cosmetics can also contain lead as a contaminant, which can be absorbed by the body through the skin or ingestion. Therefore, all the options provided - 1, 2, 3, and 4 - can be sources of lead poisoning.

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  • 46. 

    In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the 1. decomposer microorganisms to the surface.2. nutrients to the surface.3. bottom-dwelling organisms to the surface.Which of the statements given above is/are correct?

    • 1 and 2

    • 2 only

    • 2 and 3

    • 3 only

    Correct Answer
    A. 3 only
    Explanation
    Marine upwelling zones are important for ecosystem productivity because they bring nutrients to the surface. This increased availability of nutrients supports the growth of phytoplankton, which forms the base of the marine food chain. The statement that bottom-dwelling organisms are brought to the surface is incorrect. Decomposer microorganisms are not specifically mentioned in the context of marine upwelling zones, so it cannot be concluded that they are brought to the surface. Therefore, the correct statement is 3 only.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 19, 2014
    Quiz Created by
    Tanmay Shankar
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