UPSC Static Quiz – Environment : 24 May 2025
Kartavya Desk Staff
UPSC Static Quiz – Environment : 24 May 2025We 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 regarding Phosphorus and Phosphorus Cycle. Phosphorus cycle is largely atmospheric and easily dissolves in water from air. Phosphorus occurs as a mineral in phosphate rocks and enters the Phosphorus cycle from erosion and mining activities. Phosphorus is responsible for excessive growth of rooted and free-floating microscopic plants in water bodies. How many of the above statements is/are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: b) Statement 1 is incorrect. Phosphorous cycle is mainly terrestrial. The main storage for phosphorus is in the earth’s crust. On land phosphorus is usually found in the form of phosphates. It occurs in large amounts as a mineral in phosphate rocks and enters the cycle from erosion and mining activities. By the process of weathering and erosion phosphates enter rivers and streams that transport them to the ocean. Being an important nutrient, phosphorous promotes eutrophication in lakes. Along with nitrogen related compounds it leads to undesirable situations like algal bloom. Incorrect Solution: b) Statement 1 is incorrect. Phosphorous cycle is mainly terrestrial. The main storage for phosphorus is in the earth’s crust. On land phosphorus is usually found in the form of phosphates. It occurs in large amounts as a mineral in phosphate rocks and enters the cycle from erosion and mining activities. By the process of weathering and erosion phosphates enter rivers and streams that transport them to the ocean. Being an important nutrient, phosphorous promotes eutrophication in lakes. Along with nitrogen related compounds it leads to undesirable situations like algal bloom.
#### 1. Question
Consider the following statements regarding Phosphorus and Phosphorus Cycle.
• Phosphorus cycle is largely atmospheric and easily dissolves in water from air.
• Phosphorus occurs as a mineral in phosphate rocks and enters the Phosphorus cycle from erosion and mining activities.
• Phosphorus is responsible for excessive growth of rooted and free-floating microscopic plants in water bodies.
How many of the above statements is/are correct?
• (a) Only one
• (b) Only two
• (c) All three
Solution: b)
Statement 1 is incorrect.
Phosphorous cycle is mainly terrestrial. The main storage for phosphorus is in the earth’s crust. On land phosphorus is usually found in the form of phosphates.
It occurs in large amounts as a mineral in phosphate rocks and enters the cycle from erosion and mining activities.
By the process of weathering and erosion phosphates enter rivers and streams that transport them to the ocean.
Being an important nutrient, phosphorous promotes eutrophication in lakes. Along with nitrogen related compounds it leads to undesirable situations like algal bloom.
Solution: b)
Statement 1 is incorrect.
Phosphorous cycle is mainly terrestrial. The main storage for phosphorus is in the earth’s crust. On land phosphorus is usually found in the form of phosphates.
It occurs in large amounts as a mineral in phosphate rocks and enters the cycle from erosion and mining activities.
By the process of weathering and erosion phosphates enter rivers and streams that transport them to the ocean.
Being an important nutrient, phosphorous promotes eutrophication in lakes. Along with nitrogen related compounds it leads to undesirable situations like algal bloom.
• Question 2 of 5 2. Question Why do exotic species post a threat to an indigenous ecosystem such as in a Lake or an isolated island in the Andamans? Such species compete with the local or native species for food. They may be predators of local species. Such species may cause diseases in native species. How many of the above statements is/are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: c) Exotic species introduced to new environments often reset the ecological conditions in that new habitat, threatening the species that exist there; this is the reason that they are also termed invasive species. Invasive species that are closely related to rare native species have the potential to hybridize with the native species; harmful effects of hybridization have led to a decline and even extinction of native species. Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife. Lakes and islands are particularly vulnerable to extinction threats from introduced species. Incorrect Solution: c) Exotic species introduced to new environments often reset the ecological conditions in that new habitat, threatening the species that exist there; this is the reason that they are also termed invasive species. Invasive species that are closely related to rare native species have the potential to hybridize with the native species; harmful effects of hybridization have led to a decline and even extinction of native species. Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife. Lakes and islands are particularly vulnerable to extinction threats from introduced species.
#### 2. Question
Why do exotic species post a threat to an indigenous ecosystem such as in a Lake or an isolated island in the Andamans?
• Such species compete with the local or native species for food.
• They may be predators of local species.
• Such species may cause diseases in native species.
How many of the above statements is/are correct?
• (a) Only one
• (b) Only two
• (c) All three
Solution: c)
Exotic species introduced to new environments often reset the ecological conditions in that new habitat, threatening the species that exist there; this is the reason that they are also termed invasive species.
Invasive species that are closely related to rare native species have the potential to hybridize with the native species; harmful effects of hybridization have led to a decline and even extinction of native species.
Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife.
Lakes and islands are particularly vulnerable to extinction threats from introduced species.
Solution: c)
Exotic species introduced to new environments often reset the ecological conditions in that new habitat, threatening the species that exist there; this is the reason that they are also termed invasive species.
Invasive species that are closely related to rare native species have the potential to hybridize with the native species; harmful effects of hybridization have led to a decline and even extinction of native species.
Invasive species can change the food web in an ecosystem by destroying or replacing native food sources. The invasive species may provide little to no food value for wildlife.
Lakes and islands are particularly vulnerable to extinction threats from introduced species.
• Question 3 of 5 3. Question Consider the following statements regarding Parasitism. Parasitism occurs when two organisms interact, but while one benefits, the other experiences harm. Tapeworm attaching itself to the intestine of a cow is an example of Parasitism. The parasite always kill the host. How many of the above statements is/are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: b) Statement 3 is incorrect. A parasite is an organism that lives in or on another living organism, deriving nutrients from it. In this relationship the parasite benefits, but the organism being fed upon, the host, is harmed. The host is usually weakened by the parasite as it siphons resources the host would normally use to maintain itself. The parasite, however, is unlikely to kill the host. This is because the parasite needs the host to complete its reproductive cycle by spreading to another host. The reproductive cycles of parasites are often very complex, sometimes requiring more than one host species. A tapeworm is a parasite that causes disease in humans when contaminated, undercooked meat such as pork, fish, or beef is consumed. The tapeworm can live inside the intestine of the host for several years, benefiting from the food the host is bringing into its gut by eating. The parasite moves from species to species as it requires two hosts to complete its life cycle. Incorrect Solution: b) Statement 3 is incorrect. A parasite is an organism that lives in or on another living organism, deriving nutrients from it. In this relationship the parasite benefits, but the organism being fed upon, the host, is harmed. The host is usually weakened by the parasite as it siphons resources the host would normally use to maintain itself. The parasite, however, is unlikely to kill the host. This is because the parasite needs the host to complete its reproductive cycle by spreading to another host. The reproductive cycles of parasites are often very complex, sometimes requiring more than one host species. A tapeworm is a parasite that causes disease in humans when contaminated, undercooked meat such as pork, fish, or beef is consumed. The tapeworm can live inside the intestine of the host for several years, benefiting from the food the host is bringing into its gut by eating. The parasite moves from species to species as it requires two hosts to complete its life cycle.
#### 3. Question
Consider the following statements regarding Parasitism.
• Parasitism occurs when two organisms interact, but while one benefits, the other experiences harm.
• Tapeworm attaching itself to the intestine of a cow is an example of Parasitism.
• The parasite always kill the host.
How many of the above statements is/are correct?
• (a) Only one
• (b) Only two
• (c) All three
Solution: b)
Statement 3 is incorrect.
A parasite is an organism that lives in or on another living organism, deriving nutrients from it. In this relationship the parasite benefits, but the organism being fed upon, the host, is harmed. The host is usually weakened by the parasite as it siphons resources the host would normally use to maintain itself. The parasite, however, is unlikely to kill the host. This is because the parasite needs the host to complete its reproductive cycle by spreading to another host.
The reproductive cycles of parasites are often very complex, sometimes requiring more than one host species. A tapeworm is a parasite that causes disease in humans when contaminated, undercooked meat such as pork, fish, or beef is consumed. The tapeworm can live inside the intestine of the host for several years, benefiting from the food the host is bringing into its gut by eating. The parasite moves from species to species as it requires two hosts to complete its life cycle.
Solution: b)
Statement 3 is incorrect.
A parasite is an organism that lives in or on another living organism, deriving nutrients from it. In this relationship the parasite benefits, but the organism being fed upon, the host, is harmed. The host is usually weakened by the parasite as it siphons resources the host would normally use to maintain itself. The parasite, however, is unlikely to kill the host. This is because the parasite needs the host to complete its reproductive cycle by spreading to another host.
The reproductive cycles of parasites are often very complex, sometimes requiring more than one host species. A tapeworm is a parasite that causes disease in humans when contaminated, undercooked meat such as pork, fish, or beef is consumed. The tapeworm can live inside the intestine of the host for several years, benefiting from the food the host is bringing into its gut by eating. The parasite moves from species to species as it requires two hosts to complete its life cycle.
• Question 4 of 5 4. Question Increased Snow cover on a water body can lead to Sudden spurt in phytoplankton population which are not dependent on photosynthesis Improved oxygen exchange and nutrient recycling in the lake A condition of winterkill causing large scale death of fishes and organisms 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. Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population. The snow cover blocks exchange of nutrients and oxygen from the atmosphere, however the same may continue within the water stream. But it is worse than before. Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness. Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill. Incorrect Solution: a) Only Statement 3 is correct. Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population. The snow cover blocks exchange of nutrients and oxygen from the atmosphere, however the same may continue within the water stream. But it is worse than before. Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness. Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill.
#### 4. Question
Increased Snow cover on a water body can lead to
• Sudden spurt in phytoplankton population which are not dependent on photosynthesis
• Improved oxygen exchange and nutrient recycling in the lake
• A condition of winterkill causing large scale death of fishes and organisms
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.
Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population.
The snow cover blocks exchange of nutrients and oxygen from the atmosphere, however the same may continue within the water stream. But it is worse than before.
Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness.
Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill.
Solution: a)
Only Statement 3 is correct.
Phytoplankton float on top surface of water bodies and require sunlight to thrive. Ice cover will reduce their breeding grounds and population.
The snow cover blocks exchange of nutrients and oxygen from the atmosphere, however the same may continue within the water stream. But it is worse than before.
Snow cover of ice on water body can effectively cut off light, plunging the waters into darkness.
Hence photosynthesis stops but respiration continues. Thus, in shallow lakes, oxygen gets depleted, and due to lack of oxygen there is large scale death of fishes and other organisms. This condition is known as winterkill.
• Question 5 of 5 5. Question The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services along coasts like Food security for many coastal communities Regulation of coastal water quality Provision of habitat for commercially important fisheries Protection from storms and sea level rise Sequester and store coastal blue carbon from the atmosphere How many of the above statements are correct? (a) Only two (b) Only three (c) Only four (d) All five Correct Solution: d) The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services that are essential for climate change adaptation along coasts globally, including protection from storms and sea level rise, prevention of shoreline erosion, regulation of coastal water quality, provision of habitat for commercially important fisheries and endangered marine species, and food security for many coastal communities. Additionally, these ecosystems sequester and store significant amounts of coastal blue carbon from the atmosphere and ocean and hence are now recognized for their role in mitigating climate change. Incorrect Solution: d) The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services that are essential for climate change adaptation along coasts globally, including protection from storms and sea level rise, prevention of shoreline erosion, regulation of coastal water quality, provision of habitat for commercially important fisheries and endangered marine species, and food security for many coastal communities. Additionally, these ecosystems sequester and store significant amounts of coastal blue carbon from the atmosphere and ocean and hence are now recognized for their role in mitigating climate change.
#### 5. Question
The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services along coasts like
• Food security for many coastal communities
• Regulation of coastal water quality
• Provision of habitat for commercially important fisheries
• Protection from storms and sea level rise
• Sequester and store coastal blue carbon from the atmosphere
How many of the above statements are correct?
• (a) Only two
• (b) Only three
• (c) Only four
• (d) All five
Solution: d)
The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services that are essential for climate change adaptation along coasts globally, including protection from storms and sea level rise, prevention of shoreline erosion, regulation of coastal water quality, provision of habitat for commercially important fisheries and endangered marine species, and food security for many coastal communities. Additionally, these ecosystems sequester and store significant amounts of coastal blue carbon from the atmosphere and ocean and hence are now recognized for their role in mitigating climate change.
Solution: d)
The coastal ecosystems of mangroves, tidal marshes, and seagrass meadows provide numerous benefits and services that are essential for climate change adaptation along coasts globally, including protection from storms and sea level rise, prevention of shoreline erosion, regulation of coastal water quality, provision of habitat for commercially important fisheries and endangered marine species, and food security for many coastal communities. Additionally, these ecosystems sequester and store significant amounts of coastal blue carbon from the atmosphere and ocean and hence are now recognized for their role in mitigating climate change.
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