UPSC Static Quiz – Environment : 26 July 2025

UPSC Static Quiz – Environment : 26 July 2025 We will post 5 questions daily on static topics mentioned in the UPSC civil services preliminary examination syllabus. Each week will focus on a specific topic from the syllabus, such as History of India and Indian National Movement, Indian and World Geography, and more.We are excited to bring you our daily UPSC Static Quiz, designed to help you prepare for the UPSC Civil Services Preliminary Examination. Each day, we will post 5 questions on static topics mentioned in the UPSC syllabus. This week, we are focusing on Indian and World Geography.

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• Question 1 of 5 1. Question Which one of the following best describes the “Precautionary Principle” in the context of environmental policy and law? (a) Polluting industries must pay for the environmental damage they cause. (b) Environmental resources should be used in a manner that ensures their availability for future generations. (c) Where there are threats of serious or irreversible environmental damage, lack of full scientific certainty should not be used as a reason for postponing cost-effective measures to prevent environmental degradation. (d) Development projects must undergo a thorough environmental impact assessment before approval. Correct Solution: C The Precautionary Principle is a key concept in environmental governance. It stipulates that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is harmful, the burden of proof that it is not harmful falls on those taking the action. Essentially, where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. Option (a) describes the “Polluter Pays Principle.” Option (b) describes “Sustainable Development” or “Inter-generational Equity.” Option (d) describes the requirement for “Environmental Impact Assessment (EIA).” Incorrect Solution: C The Precautionary Principle is a key concept in environmental governance. It stipulates that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is harmful, the burden of proof that it is not harmful falls on those taking the action. Essentially, where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. Option (a) describes the “Polluter Pays Principle.” Option (b) describes “Sustainable Development” or “Inter-generational Equity.” Option (d) describes the requirement for “Environmental Impact Assessment (EIA).”

#### 1. Question

Which one of the following best describes the “Precautionary Principle” in the context of environmental policy and law?

• (a) Polluting industries must pay for the environmental damage they cause.

• (b) Environmental resources should be used in a manner that ensures their availability for future generations.

• (c) Where there are threats of serious or irreversible environmental damage, lack of full scientific certainty should not be used as a reason for postponing cost-effective measures to prevent environmental degradation.

• (d) Development projects must undergo a thorough environmental impact assessment before approval.

Solution: C

The Precautionary Principle is a key concept in environmental governance. It stipulates that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is harmful, the burden of proof that it is not harmful falls on those taking the action. Essentially, where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation.

Option (a) describes the “Polluter Pays Principle.”

Option (b) describes “Sustainable Development” or “Inter-generational Equity.”

Option (d) describes the requirement for “Environmental Impact Assessment (EIA).”

Solution: C

Option (a) describes the “Polluter Pays Principle.”

Option (b) describes “Sustainable Development” or “Inter-generational Equity.”

Option (d) describes the requirement for “Environmental Impact Assessment (EIA).”

• Question 2 of 5 2. Question Consider the following statements regarding Invasive alien species. Statement-I: The introduction of non-native invasive alien species can lead to a decline in native biodiversity. Statement-II: Invasive alien species often outcompete native species for resources or lack natural predators in the new environment, disrupting ecological balance. Which one of the following is correct in respect of the above statements? (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I (c) Statement-I is correct but Statement-II is incorrect (d) Statement-I is incorrect but Statement-II is correct Correct Solution: A Statement-I is correct. The introduction of non-native invasive alien species is recognized as one of the major threats to global biodiversity, often leading to the decline or extinction of native species. Statement-II is correct. Invasive alien species can cause harm because they may have competitive advantages over native species (e.g., faster growth rates, more efficient resource use), or they may not have natural predators, parasites, or diseases in their new environment to keep their populations in check. This allows them to proliferate and disrupt the existing ecological balance, leading to the impacts mentioned in Statement-I. Statement-II clearly explains the mechanisms by which invasive alien species cause a decline in native biodiversity, thus serving as the correct explanation for Statement-I. Incorrect Solution: A Statement-I is correct. The introduction of non-native invasive alien species is recognized as one of the major threats to global biodiversity, often leading to the decline or extinction of native species. Statement-II is correct. Invasive alien species can cause harm because they may have competitive advantages over native species (e.g., faster growth rates, more efficient resource use), or they may not have natural predators, parasites, or diseases in their new environment to keep their populations in check. This allows them to proliferate and disrupt the existing ecological balance, leading to the impacts mentioned in Statement-I. Statement-II clearly explains the mechanisms by which invasive alien species cause a decline in native biodiversity, thus serving as the correct explanation for Statement-I.

#### 2. Question

Consider the following statements regarding Invasive alien species.

Statement-I: The introduction of non-native invasive alien species can lead to a decline in native biodiversity.

Statement-II: Invasive alien species often outcompete native species for resources or lack natural predators in the new environment, disrupting ecological balance.

Which one of the following is correct in respect of the above statements?

• (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I

• (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I

• (c) Statement-I is correct but Statement-II is incorrect

• (d) Statement-I is incorrect but Statement-II is correct

Solution: A

• Statement-I is correct. The introduction of non-native invasive alien species is recognized as one of the major threats to global biodiversity, often leading to the decline or extinction of native species.

• Statement-II is correct. Invasive alien species can cause harm because they may have competitive advantages over native species (e.g., faster growth rates, more efficient resource use), or they may not have natural predators, parasites, or diseases in their new environment to keep their populations in check. This allows them to proliferate and disrupt the existing ecological balance, leading to the impacts mentioned in Statement-I.

Statement-II clearly explains the mechanisms by which invasive alien species cause a decline in native biodiversity, thus serving as the correct explanation for Statement-I.

Solution: A

Statement-II clearly explains the mechanisms by which invasive alien species cause a decline in native biodiversity, thus serving as the correct explanation for Statement-I.

• Question 3 of 5 3. Question Match List-I (Greenhouse Gas) with List-II (Primary Anthropogenic Source): List-I List-II Methane (CH4) 1. Industrial processes, use in refrigerants Nitrous Oxide (N2O) 2. Combustion of fossil fuels, deforestation Carbon Dioxide (CO2) 3. Agricultural activities (e.g., soil management, fertilizer use) Hydrofluorocarbons (HFCs) 4. Livestock digestion, rice paddies, landfills Select the correct answer code: A B C D (a) 4 3 2 1 (b) 2 1 4 3 (c) 4 1 2 3 (d) 2 3 4 1 Correct Solution: A Methane: Major anthropogenic sources include enteric fermentation in livestock (cattle, sheep), rice cultivation in flooded paddies, decomposition of organic waste in landfills, and natural gas leaks. So, A matches with 4. Nitrous Oxide: Primarily emitted from agricultural activities, including the use of synthetic nitrogen fertilizers, manure management, and certain industrial processes like nylon production. So, B matches with 3. Carbon Dioxide: The most significant anthropogenic greenhouse gas, primarily released from the combustion of fossil fuels (coal, oil, natural gas) for energy and transportation, as well as from deforestation and land-use change. So, C matches with 2. D. Hydrofluorocarbons (HFCs): These are synthetic gases used primarily as refrigerants in air conditioning and refrigeration systems, as blowing agents for foams, and in aerosols. They are potent greenhouse gases. So, D matches with 1. Incorrect Solution: A Methane: Major anthropogenic sources include enteric fermentation in livestock (cattle, sheep), rice cultivation in flooded paddies, decomposition of organic waste in landfills, and natural gas leaks. So, A matches with 4. Nitrous Oxide: Primarily emitted from agricultural activities, including the use of synthetic nitrogen fertilizers, manure management, and certain industrial processes like nylon production. So, B matches with 3. Carbon Dioxide: The most significant anthropogenic greenhouse gas, primarily released from the combustion of fossil fuels (coal, oil, natural gas) for energy and transportation, as well as from deforestation and land-use change. So, C matches with 2. D. Hydrofluorocarbons (HFCs): These are synthetic gases used primarily as refrigerants in air conditioning and refrigeration systems, as blowing agents for foams, and in aerosols. They are potent greenhouse gases. So, D matches with 1.

#### 3. Question

Match List-I (Greenhouse Gas) with List-II (Primary Anthropogenic Source):

List-I List-II

• Methane (CH4) 1. Industrial processes, use in refrigerants

• Nitrous Oxide (N2O) 2. Combustion of fossil fuels, deforestation

• Carbon Dioxide (CO2) 3. Agricultural activities (e.g., soil management, fertilizer use)

• Hydrofluorocarbons (HFCs) 4. Livestock digestion, rice paddies, landfills

Select the correct answer code:

• (a) 4 3 2 1

• (b) 2 1 4 3

• (c) 4 1 2 3

• (d) 2 3 4 1

Solution: A

• Methane: Major anthropogenic sources include enteric fermentation in livestock (cattle, sheep), rice cultivation in flooded paddies, decomposition of organic waste in landfills, and natural gas leaks. So, A matches with 4.

• Nitrous Oxide: Primarily emitted from agricultural activities, including the use of synthetic nitrogen fertilizers, manure management, and certain industrial processes like nylon production. So, B matches with 3.

• Carbon Dioxide: The most significant anthropogenic greenhouse gas, primarily released from the combustion of fossil fuels (coal, oil, natural gas) for energy and transportation, as well as from deforestation and land-use change. So, C matches with 2.

D. Hydrofluorocarbons (HFCs): These are synthetic gases used primarily as refrigerants in air conditioning and refrigeration systems, as blowing agents for foams, and in aerosols. They are potent greenhouse gases. So, D matches with 1.

Solution: A

• Question 4 of 5 4. Question Consider the following statements regarding “Blue Carbon” ecosystems: They primarily refer to terrestrial forests known for high carbon sequestration rates. Coastal ecosystems like mangroves, tidal marshes, and seagrass meadows are key blue carbon ecosystems. The carbon stored in blue carbon ecosystems is predominantly found in the above-ground biomass of plants. Destruction of blue carbon ecosystems can lead to the release of significant amounts of stored carbon into the atmosphere. How many of the above statements are correct? (a) Only one (b) Only two (c) Only three (d) All four Correct Solution: B Statement 1 is incorrect. “Blue Carbon” specifically refers to the carbon captured and stored by coastal and marine ecosystems. Terrestrial forests store “green carbon.” Statement 2 is correct. The primary blue carbon ecosystems are mangroves, tidal marshes (salt marshes), and seagrass meadows. These ecosystems are highly efficient at sequestering carbon. Statement 3 is incorrect. While above-ground biomass does store carbon, a very significant portion, often the majority, of carbon in blue carbon ecosystems is stored in the soils and sediments beneath them, where it can remain for centuries to millennia if undisturbed. Statement 4 is correct. When blue carbon ecosystems are degraded or destroyed (e.g., through coastal development, pollution, or unsustainable practices), the large quantities of carbon stored in their biomass and soils can be released back into the atmosphere as carbon dioxide, contributing to climate change. Incorrect Solution: B Statement 1 is incorrect. “Blue Carbon” specifically refers to the carbon captured and stored by coastal and marine ecosystems. Terrestrial forests store “green carbon.” Statement 2 is correct. The primary blue carbon ecosystems are mangroves, tidal marshes (salt marshes), and seagrass meadows. These ecosystems are highly efficient at sequestering carbon. Statement 3 is incorrect. While above-ground biomass does store carbon, a very significant portion, often the majority, of carbon in blue carbon ecosystems is stored in the soils and sediments beneath them, where it can remain for centuries to millennia if undisturbed. Statement 4 is correct. When blue carbon ecosystems are degraded or destroyed (e.g., through coastal development, pollution, or unsustainable practices), the large quantities of carbon stored in their biomass and soils can be released back into the atmosphere as carbon dioxide, contributing to climate change.

#### 4. Question

Consider the following statements regarding “Blue Carbon” ecosystems:

• They primarily refer to terrestrial forests known for high carbon sequestration rates.

• Coastal ecosystems like mangroves, tidal marshes, and seagrass meadows are key blue carbon ecosystems.

• The carbon stored in blue carbon ecosystems is predominantly found in the above-ground biomass of plants.

• Destruction of blue carbon ecosystems can lead to the release of significant amounts of stored carbon into the atmosphere.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) Only three

• (d) All four

Solution: B

• Statement 1 is incorrect. “Blue Carbon” specifically refers to the carbon captured and stored by coastal and marine ecosystems. Terrestrial forests store “green carbon.”

• Statement 2 is correct. The primary blue carbon ecosystems are mangroves, tidal marshes (salt marshes), and seagrass meadows. These ecosystems are highly efficient at sequestering carbon.

• Statement 3 is incorrect. While above-ground biomass does store carbon, a very significant portion, often the majority, of carbon in blue carbon ecosystems is stored in the soils and sediments beneath them, where it can remain for centuries to millennia if undisturbed.

• Statement 4 is correct. When blue carbon ecosystems are degraded or destroyed (e.g., through coastal development, pollution, or unsustainable practices), the large quantities of carbon stored in their biomass and soils can be released back into the atmosphere as carbon dioxide, contributing to climate change.

Solution: B

• Statement 1 is incorrect. “Blue Carbon” specifically refers to the carbon captured and stored by coastal and marine ecosystems. Terrestrial forests store “green carbon.”

• Statement 2 is correct. The primary blue carbon ecosystems are mangroves, tidal marshes (salt marshes), and seagrass meadows. These ecosystems are highly efficient at sequestering carbon.

• Question 5 of 5 5. Question Which one of the following is the most likely consequence of increased ocean acidification? (a) Enhanced growth rates of coral reefs and shellfish. (b) Increased availability of carbonate ions for shell-forming marine organisms. (c) Difficulty for marine calcifying organisms (e.g., corals, mollusks, some plankton) to build and maintain their shells and skeletons. (d) A significant rise in ocean pH levels. Correct Solution: C Ocean acidification refers to the ongoing decrease in the pH of the Earth’s oceans, caused by the uptake of anthropogenic carbon dioxide from the atmosphere. (a) Incorrect. Ocean acidification generally has detrimental effects on coral reefs and shellfish, hindering their growth and survival. (b) Incorrect. As oceans become more acidic (lower pH), the concentration of carbonate ions, which are essential building blocks for the shells and skeletons of many marine organisms, decreases. This makes it harder for them to calcify. (c) Correct. The primary concern with ocean acidification is its impact on marine calcifying organisms. The lower pH and reduced availability of carbonate ions make it more difficult for these organisms (like corals, oysters, clams, pteropods) to form and maintain their calcium carbonate shells and skeletons, potentially affecting their growth, reproduction, and survival. (d) Incorrect. Ocean acidification means a decrease in ocean pH levels (becoming more acidic), not a rise. Incorrect Solution: C Ocean acidification refers to the ongoing decrease in the pH of the Earth’s oceans, caused by the uptake of anthropogenic carbon dioxide from the atmosphere. (a) Incorrect. Ocean acidification generally has detrimental effects on coral reefs and shellfish, hindering their growth and survival. (b) Incorrect. As oceans become more acidic (lower pH), the concentration of carbonate ions, which are essential building blocks for the shells and skeletons of many marine organisms, decreases. This makes it harder for them to calcify. (c) Correct. The primary concern with ocean acidification is its impact on marine calcifying organisms. The lower pH and reduced availability of carbonate ions make it more difficult for these organisms (like corals, oysters, clams, pteropods) to form and maintain their calcium carbonate shells and skeletons, potentially affecting their growth, reproduction, and survival. (d) Incorrect. Ocean acidification means a decrease in ocean pH levels (becoming more acidic), not a rise.

#### 5. Question

Which one of the following is the most likely consequence of increased ocean acidification?

• (a) Enhanced growth rates of coral reefs and shellfish.

• (b) Increased availability of carbonate ions for shell-forming marine organisms.

• (c) Difficulty for marine calcifying organisms (e.g., corals, mollusks, some plankton) to build and maintain their shells and skeletons.

• (d) A significant rise in ocean pH levels.

Solution: C

Ocean acidification refers to the ongoing decrease in the pH of the Earth’s oceans, caused by the uptake of anthropogenic carbon dioxide from the atmosphere.

(a) Incorrect. Ocean acidification generally has detrimental effects on coral reefs and shellfish, hindering their growth and survival.

(b) Incorrect. As oceans become more acidic (lower pH), the concentration of carbonate ions, which are essential building blocks for the shells and skeletons of many marine organisms, decreases. This makes it harder for them to calcify.

(c) Correct. The primary concern with ocean acidification is its impact on marine calcifying organisms. The lower pH and reduced availability of carbonate ions make it more difficult for these organisms (like corals, oysters, clams, pteropods) to form and maintain their calcium carbonate shells and skeletons, potentially affecting their growth, reproduction, and survival.

(d) Incorrect. Ocean acidification means a decrease in ocean pH levels (becoming more acidic), not a rise.

Solution: C

Ocean acidification refers to the ongoing decrease in the pH of the Earth’s oceans, caused by the uptake of anthropogenic carbon dioxide from the atmosphere.

(a) Incorrect. Ocean acidification generally has detrimental effects on coral reefs and shellfish, hindering their growth and survival.

(d) Incorrect. Ocean acidification means a decrease in ocean pH levels (becoming more acidic), not a rise.

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