UPSC Static Quiz – Environment : 17 December 2025

UPSC Static Quiz – Environment : 17 December 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 With reference to the Biological Diversity Act, 2002, consider the following: Biodiversity Management Committees (BMCs) People’s Biodiversity Registers (PBRs) Biodiversity Heritage Sites (BHS) Which of the above is/are established or created as part of the Act’s framework for grassroots-level conservation and documentation? (a) 1 only (b) 1 and 2 only (c) 3 only (d) 1, 2 and 3 Correct Solution: D The Biological Diversity Act, 2002, is lauded for its decentralized and participatory approach to conservation. All three elements listed are integral parts of this grassroots framework. Biodiversity Management Committees (BMCs): Section 41 of the Act mandates that every local body (like Panchayats and Municipalities) shall constitute a BMC within its area. These committees are the primary institutions at the local level for promoting conservation, sustainable use, and documentation of biodiversity. People’s Biodiversity Registers (PBRs): The main function of the BMCs is to prepare a PBR in consultation with local people. The PBR is a comprehensive legal document that contains information on local biological resources, their uses, and associated traditional knowledge. It is a key tool for documenting biodiversity and asserting community rights, thus preventing biopiracy. Biodiversity Heritage Sites (BHS): Section 37 of the Act provides for the notification of BHS. These are well-defined areas that are unique, ecologically fragile ecosystems having rich biodiversity. The NBA advises State Governments on the selection of these sites. The declaration of a BHS helps in their conservation and management with the participation of local communities. Incorrect Solution: D The Biological Diversity Act, 2002, is lauded for its decentralized and participatory approach to conservation. All three elements listed are integral parts of this grassroots framework. Biodiversity Management Committees (BMCs): Section 41 of the Act mandates that every local body (like Panchayats and Municipalities) shall constitute a BMC within its area. These committees are the primary institutions at the local level for promoting conservation, sustainable use, and documentation of biodiversity. People’s Biodiversity Registers (PBRs): The main function of the BMCs is to prepare a PBR in consultation with local people. The PBR is a comprehensive legal document that contains information on local biological resources, their uses, and associated traditional knowledge. It is a key tool for documenting biodiversity and asserting community rights, thus preventing biopiracy. Biodiversity Heritage Sites (BHS): Section 37 of the Act provides for the notification of BHS. These are well-defined areas that are unique, ecologically fragile ecosystems having rich biodiversity. The NBA advises State Governments on the selection of these sites. The declaration of a BHS helps in their conservation and management with the participation of local communities.

#### 1. Question

With reference to the Biological Diversity Act, 2002, consider the following:

• Biodiversity Management Committees (BMCs)

• People’s Biodiversity Registers (PBRs)

• Biodiversity Heritage Sites (BHS)

Which of the above is/are established or created as part of the Act’s framework for grassroots-level conservation and documentation?

• (a) 1 only

• (b) 1 and 2 only

• (c) 3 only

• (d) 1, 2 and 3

Solution: D

The Biological Diversity Act, 2002, is lauded for its decentralized and participatory approach to conservation. All three elements listed are integral parts of this grassroots framework.

• Biodiversity Management Committees (BMCs): Section 41 of the Act mandates that every local body (like Panchayats and Municipalities) shall constitute a BMC within its area. These committees are the primary institutions at the local level for promoting conservation, sustainable use, and documentation of biodiversity.

• People’s Biodiversity Registers (PBRs): The main function of the BMCs is to prepare a PBR in consultation with local people. The PBR is a comprehensive legal document that contains information on local biological resources, their uses, and associated traditional knowledge. It is a key tool for documenting biodiversity and asserting community rights, thus preventing biopiracy.

• Biodiversity Heritage Sites (BHS): Section 37 of the Act provides for the notification of BHS. These are well-defined areas that are unique, ecologically fragile ecosystems having rich biodiversity. The NBA advises State Governments on the selection of these sites. The declaration of a BHS helps in their conservation and management with the participation of local communities.

Solution: D

The Biological Diversity Act, 2002, is lauded for its decentralized and participatory approach to conservation. All three elements listed are integral parts of this grassroots framework.

• Question 2 of 5 2. Question Consider the following statements. Statement I: In many aquatic ecosystems, the pyramid of biomass is inverted. Statement II: Phytoplankton, which are the primary producers in aquatic systems, have a much shorter lifespan and higher turnover rate compared to the zooplankton that feed on them. Which one of the following is correct in respect of the above statements regarding Ecological Pyramids? (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: In terrestrial ecosystems, the pyramid of biomass is usually upright (Producer biomass > Herbivore biomass). However, in aquatic ecosystems (like lakes and oceans), the pyramid of biomass is frequently inverted. The standing crop (mass of living material at a particular time) of producers is lower than that of consumers. Statement II is Correct: Phytoplankton are microscopic and reproduce extremely rapidly (high turnover). Although their standing biomass at any single snapshot in time is small, their high reproductive rate produces enough biomass over time to support a much larger biomass of longer-living zooplankton and fish. The energy flow pyramid remains upright, but the biomass pyramid inverts due to these life-history traits. Because the high turnover allows a small mass to support a larger mass, Statement II correctly explains Statement I. Incorrect Solution: A Statement I is Correct: In terrestrial ecosystems, the pyramid of biomass is usually upright (Producer biomass > Herbivore biomass). However, in aquatic ecosystems (like lakes and oceans), the pyramid of biomass is frequently inverted. The standing crop (mass of living material at a particular time) of producers is lower than that of consumers. Statement II is Correct: Phytoplankton are microscopic and reproduce extremely rapidly (high turnover). Although their standing biomass at any single snapshot in time is small, their high reproductive rate produces enough biomass over time to support a much larger biomass of longer-living zooplankton and fish. The energy flow pyramid remains upright, but the biomass pyramid inverts due to these life-history traits. Because the high turnover allows a small mass to support a larger mass, Statement II correctly explains Statement I.

#### 2. Question

Consider the following statements.

Statement I: In many aquatic ecosystems, the pyramid of biomass is inverted.

Statement II: Phytoplankton, which are the primary producers in aquatic systems, have a much shorter lifespan and higher turnover rate compared to the zooplankton that feed on them.

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

• (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: In terrestrial ecosystems, the pyramid of biomass is usually upright (Producer biomass > Herbivore biomass). However, in aquatic ecosystems (like lakes and oceans), the pyramid of biomass is frequently inverted. The standing crop (mass of living material at a particular time) of producers is lower than that of consumers.

• Statement II is Correct: Phytoplankton are microscopic and reproduce extremely rapidly (high turnover). Although their standing biomass at any single snapshot in time is small, their high reproductive rate produces enough biomass over time to support a much larger biomass of longer-living zooplankton and fish. The energy flow pyramid remains upright, but the biomass pyramid inverts due to these life-history traits.

• Because the high turnover allows a small mass to support a larger mass, Statement II correctly explains Statement I.

Solution: A

• Because the high turnover allows a small mass to support a larger mass, Statement II correctly explains Statement I.

• Question 3 of 5 3. Question Consider the following statements regarding the decomposition process in terrestrial ecosystems: The rate of decomposition is significantly slower if the detritus is rich in lignin and chitin. A low temperature and anaerobic environment favour the rapid mineralization of water-soluble sugars. Which of the above statements are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2 Correct Solution: A Statement 1 is Correct: The chemical quality of detritus is a primary determinant of decomposition rates. Lignin and chitin are complex structural polymers that are energetically difficult to break down. Specific enzymes (like ligninase) are required, which not all decomposers possess. Therefore, high concentrations of these recalcitrant substances significantly retard the rate of decomposition. Statement 2 is Incorrect: Decomposition is largely an aerobic process requiring oxygen. Anaerobiosis (lack of oxygen) inhibits the activity of aerobic bacteria and fungi, leading to the accumulation of organic matter (as seen in peat bogs). Furthermore, low temperatures significantly reduce microbial metabolic activity. Warm and moist environments are ideal for rapid decomposition. Incorrect Solution: A Statement 1 is Correct: The chemical quality of detritus is a primary determinant of decomposition rates. Lignin and chitin are complex structural polymers that are energetically difficult to break down. Specific enzymes (like ligninase) are required, which not all decomposers possess. Therefore, high concentrations of these recalcitrant substances significantly retard the rate of decomposition. Statement 2 is Incorrect: Decomposition is largely an aerobic process requiring oxygen. Anaerobiosis (lack of oxygen) inhibits the activity of aerobic bacteria and fungi, leading to the accumulation of organic matter (as seen in peat bogs). Furthermore, low temperatures significantly reduce microbial metabolic activity. Warm and moist environments are ideal for rapid decomposition.

#### 3. Question

Consider the following statements regarding the decomposition process in terrestrial ecosystems:

• The rate of decomposition is significantly slower if the detritus is rich in lignin and chitin.

• A low temperature and anaerobic environment favour the rapid mineralization of water-soluble sugars.

Which of the above statements are correct?

• (a) 1 only

• (b) 2 only

• (c) Both 1 and 2

• (d) Neither 1 nor 2

Solution: A

• Statement 1 is Correct: The chemical quality of detritus is a primary determinant of decomposition rates. Lignin and chitin are complex structural polymers that are energetically difficult to break down. Specific enzymes (like ligninase) are required, which not all decomposers possess. Therefore, high concentrations of these recalcitrant substances significantly retard the rate of decomposition.

• Statement 2 is Incorrect: Decomposition is largely an aerobic process requiring oxygen. Anaerobiosis (lack of oxygen) inhibits the activity of aerobic bacteria and fungi, leading to the accumulation of organic matter (as seen in peat bogs). Furthermore, low temperatures significantly reduce microbial metabolic activity. Warm and moist environments are ideal for rapid decomposition.

Solution: A

• Question 4 of 5 4. Question Consider the following statements regarding the chemical depletion of stratospheric ozone: Statement I: The formation of the Antarctic Ozone Hole is contingent upon the presence of Polar Stratospheric Clouds (PSCs), which form at extremely low temperatures within the polar vortex. Statement II: PSCs provide the surface for heterogeneous reactions that convert stable chlorine reservoirs, such as Chlorine Nitrate and Hydrogen Chloride, into active chlorine species that destroy ozone upon sunrise. 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 Both statements are correct, and Statement II directly explains the mechanism behind Statement I. The Antarctic ozone hole is not caused merely by the presence of chlorine compounds in the stratosphere but by a unique set of polar conditions. During the Antarctic winter, extremely low temperatures within the strong polar vortex lead to the formation of Polar Stratospheric Clouds. These clouds provide reactive surfaces for heterogeneous chemical reactions that would not occur efficiently in the gas phase. On PSC surfaces, relatively inert chlorine reservoir species such as hydrogen chloride (HCl) and chlorine nitrate (ClONO₂) are converted into photolabile forms like molecular chlorine (Cl₂). When sunlight returns in early spring, these compounds are rapidly photodissociated, releasing chlorine radicals that participate in catalytic ozone destruction cycles. Thus, PSCs are central to both initiating and amplifying ozone depletion, making Statement II a clear and accurate explanation of Statement I. Incorrect Solution: A Both statements are correct, and Statement II directly explains the mechanism behind Statement I. The Antarctic ozone hole is not caused merely by the presence of chlorine compounds in the stratosphere but by a unique set of polar conditions. During the Antarctic winter, extremely low temperatures within the strong polar vortex lead to the formation of Polar Stratospheric Clouds. These clouds provide reactive surfaces for heterogeneous chemical reactions that would not occur efficiently in the gas phase. On PSC surfaces, relatively inert chlorine reservoir species such as hydrogen chloride (HCl) and chlorine nitrate (ClONO₂) are converted into photolabile forms like molecular chlorine (Cl₂). When sunlight returns in early spring, these compounds are rapidly photodissociated, releasing chlorine radicals that participate in catalytic ozone destruction cycles. Thus, PSCs are central to both initiating and amplifying ozone depletion, making Statement II a clear and accurate explanation of Statement I.

#### 4. Question

Consider the following statements regarding the chemical depletion of stratospheric ozone:

Statement I: The formation of the Antarctic Ozone Hole is contingent upon the presence of Polar Stratospheric Clouds (PSCs), which form at extremely low temperatures within the polar vortex.

Statement II: PSCs provide the surface for heterogeneous reactions that convert stable chlorine reservoirs, such as Chlorine Nitrate and Hydrogen Chloride, into active chlorine species that destroy ozone upon sunrise.

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

• Both statements are correct, and Statement II directly explains the mechanism behind Statement I.

• The Antarctic ozone hole is not caused merely by the presence of chlorine compounds in the stratosphere but by a unique set of polar conditions.

• During the Antarctic winter, extremely low temperatures within the strong polar vortex lead to the formation of Polar Stratospheric Clouds. These clouds provide reactive surfaces for heterogeneous chemical reactions that would not occur efficiently in the gas phase.

• On PSC surfaces, relatively inert chlorine reservoir species such as hydrogen chloride (HCl) and chlorine nitrate (ClONO₂) are converted into photolabile forms like molecular chlorine (Cl₂).

• When sunlight returns in early spring, these compounds are rapidly photodissociated, releasing chlorine radicals that participate in catalytic ozone destruction cycles.

• Thus, PSCs are central to both initiating and amplifying ozone depletion, making Statement II a clear and accurate explanation of Statement I.

Solution: A

• Both statements are correct, and Statement II directly explains the mechanism behind Statement I.

• The Antarctic ozone hole is not caused merely by the presence of chlorine compounds in the stratosphere but by a unique set of polar conditions.

• On PSC surfaces, relatively inert chlorine reservoir species such as hydrogen chloride (HCl) and chlorine nitrate (ClONO₂) are converted into photolabile forms like molecular chlorine (Cl₂).

• When sunlight returns in early spring, these compounds are rapidly photodissociated, releasing chlorine radicals that participate in catalytic ozone destruction cycles.

• Thus, PSCs are central to both initiating and amplifying ozone depletion, making Statement II a clear and accurate explanation of Statement I.

• Question 5 of 5 5. Question Consider the following statements: Statement I: Ocean acidification and eutrophication are distinct environmental problems, but they can interact to create more severe impacts in coastal ecosystems. Statement II: Eutrophication leads to algal blooms, and the subsequent decomposition of this organic matter releases large amounts of carbon dioxide, further lowering the pH of the water. Statement III: The primary driver for both global ocean acidification and widespread coastal eutrophication is the increased concentration of atmospheric nitrogen oxides from industrial emissions. Which one of the following is correct in respect of the above statements? (a) Both Statement II and Statement III are correct and both of them explain Statement I (b) Both Statement II and Statement III are correct but only one of them explains Statement I (c) Only one of the Statements II and III is correct and that explains Statement I (d) Neither Statement II nor Statement III is correct Correct Solution: C Statement Iis a correct premise. While ocean acidification is a global issue driven by atmospheric absorption, and eutrophication is a more localized issue driven by nutrient runoff, they can have synergistic negative effects in coastal zones. Statement IIcorrectly explains one of the key mechanisms of this interaction. Eutrophication causes algal blooms. When these algae die and are decomposed by bacteria, the process of respiration releases significant amounts of carbon dioxide into the water column. This locally produced adds to the absorbed from the atmosphere, exacerbating the acidification process and creating localized, intense low-pH events. Thus, Statement II is correct and provides a valid explanation for the interaction mentioned in Statement I. Statement IIIis incorrect. The primary driver for global ocean acidification is atmospheric carbon dioxide, mainly from fossil fuel combustion. The primary drivers for eutrophication are nitrogen and phosphorus compounds, largely from agricultural runoff and sewage, not atmospheric nitrogen oxides alone. While atmospheric deposition of nitrogen can contribute to eutrophication, it is not the sole or primary driver for both phenomena. Therefore, only Statement II is correct and it explains Statement I. Incorrect Solution: C Statement Iis a correct premise. While ocean acidification is a global issue driven by atmospheric absorption, and eutrophication is a more localized issue driven by nutrient runoff, they can have synergistic negative effects in coastal zones. Statement IIcorrectly explains one of the key mechanisms of this interaction. Eutrophication causes algal blooms. When these algae die and are decomposed by bacteria, the process of respiration releases significant amounts of carbon dioxide into the water column. This locally produced adds to the absorbed from the atmosphere, exacerbating the acidification process and creating localized, intense low-pH events. Thus, Statement II is correct and provides a valid explanation for the interaction mentioned in Statement I. Statement IIIis incorrect. The primary driver for global ocean acidification is atmospheric carbon dioxide, mainly from fossil fuel combustion. The primary drivers for eutrophication are nitrogen and phosphorus compounds, largely from agricultural runoff and sewage, not atmospheric nitrogen oxides alone. While atmospheric deposition of nitrogen can contribute to eutrophication, it is not the sole or primary driver for both phenomena. Therefore, only Statement II is correct and it explains Statement I.

#### 5. Question

Consider the following statements:

Statement I: Ocean acidification and eutrophication are distinct environmental problems, but they can interact to create more severe impacts in coastal ecosystems.

Statement II: Eutrophication leads to algal blooms, and the subsequent decomposition of this organic matter releases large amounts of carbon dioxide, further lowering the pH of the water.

Statement III: The primary driver for both global ocean acidification and widespread coastal eutrophication is the increased concentration of atmospheric nitrogen oxides from industrial emissions.

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

• (a) Both Statement II and Statement III are correct and both of them explain Statement I

• (b) Both Statement II and Statement III are correct but only one of them explains Statement I

• (c) Only one of the Statements II and III is correct and that explains Statement I

• (d) Neither Statement II nor Statement III is correct

Solution: C

• Statement Iis a correct premise. While ocean acidification is a global issue driven by atmospheric absorption, and eutrophication is a more localized issue driven by nutrient runoff, they can have synergistic negative effects in coastal zones.

• Statement IIcorrectly explains one of the key mechanisms of this interaction. Eutrophication causes algal blooms. When these algae die and are decomposed by bacteria, the process of respiration releases significant amounts of carbon dioxide into the water column. This locally produced adds to the absorbed from the atmosphere, exacerbating the acidification process and creating localized, intense low-pH events.

• Thus, Statement II is correct and provides a valid explanation for the interaction mentioned in Statement I.

• Statement IIIis incorrect. The primary driver for global ocean acidification is atmospheric carbon dioxide, mainly from fossil fuel combustion. The primary drivers for eutrophication are nitrogen and phosphorus compounds, largely from agricultural runoff and sewage, not atmospheric nitrogen oxides alone. While atmospheric deposition of nitrogen can contribute to eutrophication, it is not the sole or primary driver for both phenomena. Therefore, only Statement II is correct and it explains Statement I.

Solution: C

• Thus, Statement II is correct and provides a valid explanation for the interaction mentioned in Statement I.

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