UPSC Static Quiz – Environment : 19 April 2025
Kartavya Desk Staff
UPSC Static Quiz – Environment : 19 April 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 Consider the following statements. The energy required for the life within the biosphere comes only from the sun. Ecotone is larger than a biome. A well-developed ecotone may contain some unique organisms which might be absent in the adjacent ecosystems. How many of the above statements is/are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: a) Only Statement 3 is correct. The energy required for the life within the biosphere usually comes from the sun. But, Chemosynthetic bacteria are organisms that use inorganic molecules as a source of energy and convert them into organic substances. They do not need sunlight for their survival. Chemosynthetic bacteria, unlike plants, obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulfur, hydrogen sulfide and ferrous iron to produce the organic compounds needed for their subsistence. Most chemosynthetic bacteria live in environments where sunlight is unable to penetrate and which are considered inhospitable to most known organisms. Ecotone is a zone of junction between two or more diverse ecosystems. For e.g. the mangrove forests represent an ecotone between marine and terrestrial ecosystem. It may be very narrow or quite wide, but not larger than a biome which is a much larger entity. Well-developed ecotones contain some organisms which are entirely different from that of the adjoining communities. Incorrect Solution: a) Only Statement 3 is correct. The energy required for the life within the biosphere usually comes from the sun. But, Chemosynthetic bacteria are organisms that use inorganic molecules as a source of energy and convert them into organic substances. They do not need sunlight for their survival. Chemosynthetic bacteria, unlike plants, obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulfur, hydrogen sulfide and ferrous iron to produce the organic compounds needed for their subsistence. Most chemosynthetic bacteria live in environments where sunlight is unable to penetrate and which are considered inhospitable to most known organisms. Ecotone is a zone of junction between two or more diverse ecosystems. For e.g. the mangrove forests represent an ecotone between marine and terrestrial ecosystem. It may be very narrow or quite wide, but not larger than a biome which is a much larger entity. Well-developed ecotones contain some organisms which are entirely different from that of the adjoining communities.
#### 1. Question
Consider the following statements.
• The energy required for the life within the biosphere comes only from the sun.
• Ecotone is larger than a biome.
• A well-developed ecotone may contain some unique organisms which might be absent in the adjacent ecosystems.
How many of the above statements is/are correct?
• (a) Only one
• (b) Only two
• (c) All three
Solution: a)
Only Statement 3 is correct.
The energy required for the life within the biosphere usually comes from the sun. But, Chemosynthetic bacteria are organisms that use inorganic molecules as a source of energy and convert them into organic substances. They do not need sunlight for their survival.
Chemosynthetic bacteria, unlike plants, obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulfur, hydrogen sulfide and ferrous iron to produce the organic compounds needed for their subsistence.
Most chemosynthetic bacteria live in environments where sunlight is unable to penetrate and which are considered inhospitable to most known organisms.
Ecotone is a zone of junction between two or more diverse ecosystems. For e.g. the mangrove forests represent an ecotone between marine and terrestrial ecosystem. It may be very narrow or quite wide, but not larger than a biome which is a much larger entity. Well-developed ecotones contain some organisms which are entirely different from that of the adjoining communities.
Solution: a)
Only Statement 3 is correct.
The energy required for the life within the biosphere usually comes from the sun. But, Chemosynthetic bacteria are organisms that use inorganic molecules as a source of energy and convert them into organic substances. They do not need sunlight for their survival.
Chemosynthetic bacteria, unlike plants, obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulfur, hydrogen sulfide and ferrous iron to produce the organic compounds needed for their subsistence.
Most chemosynthetic bacteria live in environments where sunlight is unable to penetrate and which are considered inhospitable to most known organisms.
Ecotone is a zone of junction between two or more diverse ecosystems. For e.g. the mangrove forests represent an ecotone between marine and terrestrial ecosystem. It may be very narrow or quite wide, but not larger than a biome which is a much larger entity. Well-developed ecotones contain some organisms which are entirely different from that of the adjoining communities.
• Question 2 of 5 2. Question Consider the following statements. In the composition of living organisms, carbon constitutes the maximum share in the total weight of organisms. In the total quantity of global carbon, maximum percentage of carbon is found dissolved in oceans. Which of the above statements is/are correct? a) 1 only b) 2 only c) Both d) None Correct Solution: b) When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere. Incorrect Solution: b) When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
#### 2. Question
Consider the following statements.
• In the composition of living organisms, carbon constitutes the maximum share in the total weight of organisms.
• In the total quantity of global carbon, maximum percentage of carbon is found dissolved in oceans.
Which of the above statements is/are correct?
Solution: b)
When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
Solution: b)
When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
• Question 3 of 5 3. Question Which of the following activities releases carbon dioxide into the atmosphere? Respiratory activities of the producers and consumers. Processing of waste materials by Decomposers. Forest Fire Combustion of organic matter Volcanic activity How many of the above options is/are correct? (a) Only two (b) Only three (c) Only four (d) All five Correct Solution: d) A considerable amount of carbon returns to the atmosphere as CO2 through respiratory activities of the producers and consumers. Decomposers also contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans. Some amount of the fixed carbon is lost to sediments and removed from circulation. Burning of wood, forest fire and combustion of organic matter, fossil fuel, volcanic activity are additional sources for releasing CO2 in the atmosphere. Human activities have significantly influenced the carbon cycle. Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere. When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere. Incorrect Solution: d) A considerable amount of carbon returns to the atmosphere as CO2 through respiratory activities of the producers and consumers. Decomposers also contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans. Some amount of the fixed carbon is lost to sediments and removed from circulation. Burning of wood, forest fire and combustion of organic matter, fossil fuel, volcanic activity are additional sources for releasing CO2 in the atmosphere. Human activities have significantly influenced the carbon cycle. Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere. When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
#### 3. Question
Which of the following activities releases carbon dioxide into the atmosphere?
• Respiratory activities of the producers and consumers.
• Processing of waste materials by Decomposers.
• Forest Fire
• Combustion of organic matter
• Volcanic activity
How many of the above options is/are correct?
• (a) Only two
• (b) Only three
• (c) Only four
• (d) All five
Solution: d)
A considerable amount of carbon returns to the atmosphere as CO2 through respiratory activities of the
producers and consumers. Decomposers also contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans. Some amount of the fixed carbon is lost to sediments and removed from circulation. Burning of wood, forest fire and combustion of organic matter, fossil fuel, volcanic activity are additional sources for releasing CO2 in the atmosphere.
Human activities have significantly influenced the carbon cycle. Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the
atmosphere.
When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
Solution: d)
A considerable amount of carbon returns to the atmosphere as CO2 through respiratory activities of the
producers and consumers. Decomposers also contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans. Some amount of the fixed carbon is lost to sediments and removed from circulation. Burning of wood, forest fire and combustion of organic matter, fossil fuel, volcanic activity are additional sources for releasing CO2 in the atmosphere.
Human activities have significantly influenced the carbon cycle. Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the
atmosphere.
When you study the composition of living organisms, carbon constitutes 49 per cent of dry weight of organisms and is next only to water. If we look at the total quantity of global carbon, we find that 71 per cent carbon is found dissolved in oceans. This oceanic reservoir regulates the amount of carbon dioxide in the atmosphere.
• Question 4 of 5 4. Question Which among the following is the main constituents of Biogas? a) Methane and Hydrogen Sulfide b) Methane and Nitrogen c) Methane and Hydrogen d) Methane and Carbon Dioxide Correct Solution: d) Biogas is a renewable fuel produced through the anaerobic digestion of organic matter such as animal waste, plant residues, and sewage sludge by microorganisms in the absence of oxygen. The primary constituents of biogas are methane (CH₄), which typically makes up about 50–75%, and carbon dioxide (CO₂), comprising 25–50%. Methane is the main energy-yielding component, making biogas combustible and suitable for use as a fuel for heating, electricity generation, and even as a vehicle fuel after purification. Carbon dioxide, while non-combustible, affects the energy content and must be removed during biogas upgrading for specific applications like pipeline injection. Small traces of other gases such as hydrogen sulfide (H₂S), nitrogen (N₂), hydrogen (H₂), and oxygen (O₂) may be present depending on feedstock composition and digestion conditions. These impurities can be corrosive or toxic and are typically removed during purification. Incorrect Solution: d) Biogas is a renewable fuel produced through the anaerobic digestion of organic matter such as animal waste, plant residues, and sewage sludge by microorganisms in the absence of oxygen. The primary constituents of biogas are methane (CH₄), which typically makes up about 50–75%, and carbon dioxide (CO₂), comprising 25–50%. Methane is the main energy-yielding component, making biogas combustible and suitable for use as a fuel for heating, electricity generation, and even as a vehicle fuel after purification. Carbon dioxide, while non-combustible, affects the energy content and must be removed during biogas upgrading for specific applications like pipeline injection. Small traces of other gases such as hydrogen sulfide (H₂S), nitrogen (N₂), hydrogen (H₂), and oxygen (O₂) may be present depending on feedstock composition and digestion conditions. These impurities can be corrosive or toxic and are typically removed during purification.
#### 4. Question
Which among the following is the main constituents of Biogas?
• a) Methane and Hydrogen Sulfide
• b) Methane and Nitrogen
• c) Methane and Hydrogen
• d) Methane and Carbon Dioxide
Solution: d)
• Biogas is a renewable fuel produced through the anaerobic digestion of organic matter such as animal waste, plant residues, and sewage sludge by microorganisms in the absence of oxygen.
• The primary constituents of biogas are methane (CH₄), which typically makes up about 50–75%, and carbon dioxide (CO₂), comprising 25–50%.
• Methane is the main energy-yielding component, making biogas combustible and suitable for use as a fuel for heating, electricity generation, and even as a vehicle fuel after purification.
• Carbon dioxide, while non-combustible, affects the energy content and must be removed during biogas upgrading for specific applications like pipeline injection. Small traces of other gases such as hydrogen sulfide (H₂S), nitrogen (N₂), hydrogen (H₂), and oxygen (O₂) may be present depending on feedstock composition and digestion conditions.
• These impurities can be corrosive or toxic and are typically removed during purification.
Solution: d)
• Biogas is a renewable fuel produced through the anaerobic digestion of organic matter such as animal waste, plant residues, and sewage sludge by microorganisms in the absence of oxygen.
• The primary constituents of biogas are methane (CH₄), which typically makes up about 50–75%, and carbon dioxide (CO₂), comprising 25–50%.
• Methane is the main energy-yielding component, making biogas combustible and suitable for use as a fuel for heating, electricity generation, and even as a vehicle fuel after purification.
• Carbon dioxide, while non-combustible, affects the energy content and must be removed during biogas upgrading for specific applications like pipeline injection. Small traces of other gases such as hydrogen sulfide (H₂S), nitrogen (N₂), hydrogen (H₂), and oxygen (O₂) may be present depending on feedstock composition and digestion conditions.
• These impurities can be corrosive or toxic and are typically removed during purification.
• Question 5 of 5 5. Question Consider the following statements with reference to Food chains. The grazing food chain is found only in terrestrial ecosystem. The grazing and detritus food chains are not interlinked. The initial energy source for detritus food chain is dead organic matter. How many of the above statements is/are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: a) Only Statement 3 is correct. A sequence of organisms that feed on one another, form a food chain. In nature, two main types of food chains have been found: Grazing food chain and Detritus food chain. The grazing food chain starts with producers or autotrophs as base, which is consumed by heterotrophs. It is found in both Terrestrial and aquatic ecosystems. The Detritus food chain starts from dead organic ‘matter of decaying animals and plant bodies to the microorganisms and then to detritus feeding organism called detrivores or decomposer and to other predators. The two food chains are linked as the initial energy source for detritus food chain is the waste materials and dead organic matter from the grazing food chain. Incorrect Solution: a) Only Statement 3 is correct. A sequence of organisms that feed on one another, form a food chain. In nature, two main types of food chains have been found: Grazing food chain and Detritus food chain. The grazing food chain starts with producers or autotrophs as base, which is consumed by heterotrophs. It is found in both Terrestrial and aquatic ecosystems. The Detritus food chain starts from dead organic ‘matter of decaying animals and plant bodies to the microorganisms and then to detritus feeding organism called detrivores or decomposer and to other predators. The two food chains are linked as the initial energy source for detritus food chain is the waste materials and dead organic matter from the grazing food chain.
#### 5. Question
Consider the following statements with reference to Food chains.
• The grazing food chain is found only in terrestrial ecosystem.
• The grazing and detritus food chains are not interlinked.
• The initial energy source for detritus food chain is dead organic matter.
How many of the above statements is/are correct?
• (a) Only one
• (b) Only two
• (c) All three
Solution: a)
Only Statement 3 is correct.
• A sequence of organisms that feed on one another, form a food chain. In nature, two main types of food chains have been found: Grazing food chain and Detritus food chain.
• The grazing food chain starts with producers or autotrophs as base, which is consumed by heterotrophs. It is found in both Terrestrial and aquatic ecosystems.
• The Detritus food chain starts from dead organic ‘matter of decaying animals and plant bodies to the microorganisms and then to detritus feeding organism called detrivores or decomposer and to other predators.
• The two food chains are linked as the initial energy source for detritus food chain is the waste materials and dead organic matter from the grazing food chain.
Solution: a)
Only Statement 3 is correct.
• A sequence of organisms that feed on one another, form a food chain. In nature, two main types of food chains have been found: Grazing food chain and Detritus food chain.
• The grazing food chain starts with producers or autotrophs as base, which is consumed by heterotrophs. It is found in both Terrestrial and aquatic ecosystems.
• The Detritus food chain starts from dead organic ‘matter of decaying animals and plant bodies to the microorganisms and then to detritus feeding organism called detrivores or decomposer and to other predators.
• The two food chains are linked as the initial energy source for detritus food chain is the waste materials and dead organic matter from the grazing food chain.
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