Static Quiz 12 December 2024 (Environment)
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Static Quiz 12 December 2024 (Environment) For UPSC Exam
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- Question 1 of 5
1. Question
With reference to the Energy Pyramid, consider the following statements:
1. The energy transfer between successive trophic levels is governed by the 25% law of energy transfer.
2. The energy pyramid is always upright, irrespective of the ecosystem.
Which of the above statements is/are correct?
CorrectAnswer: (b) 2 only
Explanation:
1. Statement 1: Incorrect
According to the 10% law proposed by Lindeman, only about 10% of the energy at one trophic level is transferred to the next trophic level, while the remaining energy is lost as heat or used for metabolic processes.
2. Statement 2: Correct
The energy pyramid is always upright because energy decreases at each successive trophic level due to the loss of energy during transfer. This is true for all ecosystems, including aquatic and terrestrial.
IncorrectAnswer: (b) 2 only
Explanation:
1. Statement 1: Incorrect
According to the 10% law proposed by Lindeman, only about 10% of the energy at one trophic level is transferred to the next trophic level, while the remaining energy is lost as heat or used for metabolic processes.
2. Statement 2: Correct
The energy pyramid is always upright because energy decreases at each successive trophic level due to the loss of energy during transfer. This is true for all ecosystems, including aquatic and terrestrial.
- Question 2 of 5
2. Question
Which of the following statements regarding circadian rhythm is/are correct?
1. Circadian rhythm arises due to environmental cues like light and temperature.
2. It is exclusively observed in birds and mammals and is crucial for their survival.
Select the correct answer using the codes given below:
CorrectAnswer: (a) 1 only
Explanation:
1. Statement 1: Correct
Circadian rhythms are biological cycles that follow a 24-hour pattern, largely influenced by external factors such as light and temperature. These rhythms regulate various physiological processes like sleep, hormone release, and metabolism.
2. Statement 2: Incorrect
Circadian rhythms are not restricted to birds and mammals. They are found in a wide variety of organisms, including plants, fungi, and even certain bacteria, playing a key role in their functioning and adaptation to the environment.
Therefore, only Statement 1 is correct.
IncorrectAnswer: (a) 1 only
Explanation:
1. Statement 1: Correct
Circadian rhythms are biological cycles that follow a 24-hour pattern, largely influenced by external factors such as light and temperature. These rhythms regulate various physiological processes like sleep, hormone release, and metabolism.
2. Statement 2: Incorrect
Circadian rhythms are not restricted to birds and mammals. They are found in a wide variety of organisms, including plants, fungi, and even certain bacteria, playing a key role in their functioning and adaptation to the environment.
Therefore, only Statement 1 is correct.
- Question 3 of 5
3. Question
Which of the following statements about diapause is/are correct?
1. Diapause is a period of suspended growth or development in certain organisms to survive unfavorable environmental conditions.
2. It occurs only in insects and is triggered by photoperiod changes.
3. Diapause can be observed in only adult stage of some organisms.
Select the correct answer using the codes given below:
CorrectAnswer: (a) Only One
Explanation:
1. Statement 1: Correct
Diapause is a survival strategy in certain organisms, allowing them to pause growth and development during adverse conditions like extreme temperatures or lack of resources.
2. Statement 2: Incorrect
Diapause is not limited to insects; it can also occur in other organisms, such as fish and crustaceans. While photoperiod (day length) is one trigger, other environmental factors like temperature and resource availability also influence it.
3. Statement 3: Incorrect
Diapause can occur at various life stages, such as the embryonic stage (e.g., in some fish) or the adult stage (e.g., in insects like beetles).
Thus, only Statement 1 is correct.
IncorrectAnswer: (a) Only One
Explanation:
1. Statement 1: Correct
Diapause is a survival strategy in certain organisms, allowing them to pause growth and development during adverse conditions like extreme temperatures or lack of resources.
2. Statement 2: Incorrect
Diapause is not limited to insects; it can also occur in other organisms, such as fish and crustaceans. While photoperiod (day length) is one trigger, other environmental factors like temperature and resource availability also influence it.
3. Statement 3: Incorrect
Diapause can occur at various life stages, such as the embryonic stage (e.g., in some fish) or the adult stage (e.g., in insects like beetles).
Thus, only Statement 1 is correct.
- Question 4 of 5
4. Question
How many of the following statements regarding an ecological niche is/are correct?
1. It refers to the role and position of a species within its environment.
2. It includes interactions with both biotic and abiotic factors.
3. Two species can occupy the same niche in a stable ecosystem.
Options:
CorrectAnswer: (b) Two
Explanation:
Statements 1 and 2 are correct as the ecological niche defines a species’ functional role and its interactions with both living and non-living components.
Statement 3 is incorrect because no two species can occupy the exact same niche in a stable ecosystem due to competitive exclusion.
IncorrectAnswer: (b) Two
Explanation:
Statements 1 and 2 are correct as the ecological niche defines a species’ functional role and its interactions with both living and non-living components.
Statement 3 is incorrect because no two species can occupy the exact same niche in a stable ecosystem due to competitive exclusion.
- Question 5 of 5
5. Question
What is spatial variation in ecotones?
CorrectAnswer: (a) Diverse conditions and habitats within an ecotone
Spatial variation in ecotones refers to the transition zone between two ecosystems.
IncorrectAnswer: (a) Diverse conditions and habitats within an ecotone
Spatial variation in ecotones refers to the transition zone between two ecosystems.
