Static Quiz 18 February 2025 (Environment)
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Static Quiz 18 February 2025 (Environment) For UPSC Exam
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- Question 1 of 5
1. Question
Consider the following statements:
1. Grazing food chains can be found in both terrestrial and aquatic ecosystems.
2. The major conduit of energy flow in aquatic ecosystems is through the grazing food chain.
3. A much larger fraction of energy flows through the detritus food chain in terrestrial ecosystems compared to the grazing food chain.
How many of the statements given above are incorrect?CorrectQ1. D
Explanation:
Statement 1 is correct : In the grazing food chain the transfer of energy starts to transfer from autotrophs . Grazing animals such as cow, sheep , zooplanktons etc plays major role in grazing food chain
○ Grazing ecosystems can be found in both terrestrial and aquatic ecosystems.
Statement 2 is correct: In aquatic ecosystems, major conduit of energy flow is through the grazing food chain. Phytoplankton are producers and zooplanktons eat up it and thus flow of energy happens.
Statement 3 is correct : In the Terrestrial ecosystem, a larger fraction of energy flows through the detritus food chain than grazing food chain.
Detritus food chain :
• The Detritus food chain starts from dead organic matter of decaying animals .
Micro organisms such as fungi and bacteria play a major role in the detritus food chain which are called as detritivores or decomposers.IncorrectQ1. D
Explanation:
Statement 1 is correct : In the grazing food chain the transfer of energy starts to transfer from autotrophs . Grazing animals such as cow, sheep , zooplanktons etc plays major role in grazing food chain
○ Grazing ecosystems can be found in both terrestrial and aquatic ecosystems.
Statement 2 is correct: In aquatic ecosystems, major conduit of energy flow is through the grazing food chain. Phytoplankton are producers and zooplanktons eat up it and thus flow of energy happens.
Statement 3 is correct : In the Terrestrial ecosystem, a larger fraction of energy flows through the detritus food chain than grazing food chain.
Detritus food chain :
• The Detritus food chain starts from dead organic matter of decaying animals .
Micro organisms such as fungi and bacteria play a major role in the detritus food chain which are called as detritivores or decomposers. - Question 2 of 5
2. Question
Consider the following pairs with respect to ecological successions:
Succession Type Description/Characteristics
1. Autogenic Succession by abiotic components of the ecosystem
2. Hydrarch Succession taking place in aquatic ecosystem
3. Xerarch Succession in dry land
4. Allogenic Succession by biotic components of the ecosystemMatch the following pairs correctly using the code:
CorrectQ2.C
Explanation:
1. Autogenic succession – Succession by biotic components of the ecosystem.
2. Hydrarch succession – Succession takes place in an aquatic ecosystem.
3. Xerarch succession – Succession in dry land.
4. Allogenic succession – Succession by abiotic components of the ecosystem.IncorrectQ2.C
Explanation:
1. Autogenic succession – Succession by biotic components of the ecosystem.
2. Hydrarch succession – Succession takes place in an aquatic ecosystem.
3. Xerarch succession – Succession in dry land.
4. Allogenic succession – Succession by abiotic components of the ecosystem. - Question 3 of 5
3. Question
Consider the following statements regarding energy flow in an ecosystem:
1. The efficiency of transferring energy from one trophic level to another is referred to as ecological efficiency.
2. Bioaccumulation entails the progressive concentration of pollutants or toxins through higher trophic levels.
3. Biomagnification describes the gradual accumulation of pollutants or chemicals in organisms.
How many of the above statements are correctly matched?CorrectQ3. A
Explanation:
Statement 3 is incorrect
● Statement 1 is correct : Ecological efficiency can be defined as the Efficiency of transferring of energy from
one trophic level to another level ( producer to consumers) .
• Statement 2 is correct : Biomagnification is the progressive concentration of pollutants or toxic through higher trophic levels. The pollution should be fat soluble and not water soluble for biomagnification to happen. Hence• ● Statement 3 is incorrect : Bioaccumulation is the accumulation of pollutants or chemicals gradually in an organism. Persistent organic pollutants like DDT are long lasting and risk of bioaccumulation is very high.
Hence.IncorrectQ3. A
Explanation:
Statement 3 is incorrect
● Statement 1 is correct : Ecological efficiency can be defined as the Efficiency of transferring of energy from
one trophic level to another level ( producer to consumers) .
• Statement 2 is correct : Biomagnification is the progressive concentration of pollutants or toxic through higher trophic levels. The pollution should be fat soluble and not water soluble for biomagnification to happen. Hence• ● Statement 3 is incorrect : Bioaccumulation is the accumulation of pollutants or chemicals gradually in an organism. Persistent organic pollutants like DDT are long lasting and risk of bioaccumulation is very high.
Hence. - Question 4 of 5
4. Question
Which of the following statements best defines the term “Homeostasis” in the function of an ecosystem?
CorrectQ4. A
Explanation:
• Homeostasis is the self regulating capacity of an ecosystem to maintain its stability by featuring resistance to change . This tendency makes the ecosystem in the state of equilibrium.• Developing niche specialisation for particular communities of species is an example of Homeostasis to reduce competition in resource partitioning and maintains equilibrium within ecosystem.
IncorrectQ4. A
Explanation:
• Homeostasis is the self regulating capacity of an ecosystem to maintain its stability by featuring resistance to change . This tendency makes the ecosystem in the state of equilibrium.• Developing niche specialisation for particular communities of species is an example of Homeostasis to reduce competition in resource partitioning and maintains equilibrium within ecosystem.
- Question 5 of 5
5. Question
Consider the following pairs regarding homeostasis of an ecosystem:
Homeostasis Terms Definition/Examples
1. Thermoregulation Change in body temperature in response to the surrounding temperature
2. Thermal Conformity Maintaining internal body temperature consistent with surroundings
3. Seed Dormancy Suspension Temporary halting of seed germination
4. Seasonal Migration Temporary movement of organisms from their habitatHow many of the above pairs are correctly matched?
CorrectQ5.B
Explanation :Homeostasis is the self regulating capacity of an ecosystem to maintain its stability by featuring resistance to change.
Types of homeostasis in an ecosystem are● Pair 1 is incorrect: Thermoregulation : Maintaining internal body temperature. Warm blooded animals
such as humans regulate their body temperature in regards to constant internal temperature
● Pair 2 is incorrect: Thermal Conformity: Change in body temperature with surrounding temperature
change.
○ Cold blooded animals such as fish, lizards and invertebrates are generally known as conformers
● Pair 3 is correct: Seed Dormancy Suspension: Temporary stopping of seed germination.
○ It helps in the dispersal of the seeds through the unfavourable environment. Dormancy induced by
the inhibitors present in the seed coats is highly useful to desert plants.
● Pair 4 is correct: Seasonal Migration: temporary movement of organisms from its habitat to other placesIncorrectQ5.B
Explanation :Homeostasis is the self regulating capacity of an ecosystem to maintain its stability by featuring resistance to change.
Types of homeostasis in an ecosystem are● Pair 1 is incorrect: Thermoregulation : Maintaining internal body temperature. Warm blooded animals
such as humans regulate their body temperature in regards to constant internal temperature
● Pair 2 is incorrect: Thermal Conformity: Change in body temperature with surrounding temperature
change.
○ Cold blooded animals such as fish, lizards and invertebrates are generally known as conformers
● Pair 3 is correct: Seed Dormancy Suspension: Temporary stopping of seed germination.
○ It helps in the dispersal of the seeds through the unfavourable environment. Dormancy induced by
the inhibitors present in the seed coats is highly useful to desert plants.
● Pair 4 is correct: Seasonal Migration: temporary movement of organisms from its habitat to other places
