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Q. No.In ecosystems, the flow of energy is:
| 1. | Cyclical, like the flow of nutrients. |
| 2. | Unidirectional from the sun through various trophic levels. |
| 3. | From consumers to producers to decomposers. |
| 4. | Equally distributed among all trophic levels |
Subtopic: Components & Types of Ecosystems |
96%
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A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment is called as:
| 1. | Population | 2. | Biological community |
| 3. | Ecosystem | 4. | Biome |
Subtopic: Introduction |
83%
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What is the fate of the vast majority of energy entering into an ecosystem?
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
70%
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | In a particular climatic condition, decomposition rate is quicker if detritus is rich in lignin and chitin, and slower, if detritus is rich in nitrogen and water-soluble substances like sugars. |
| Statement II: | Warm and moist environment favour decomposition whereas low temperature and anaerobiosis inhibit decomposition. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Decomposition |
91%
From NCERT
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Organisms that are capable of conversion of inorganic material into organic material with the help of the radiant energy of the sun include:
| I: | Plants |
| II: | Photosynthetic bacteria |
| III: | Chemosynthetic bacteria |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II, and III |
Subtopic: Introduction |
63%
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Ecologists and evolutionary biologists study biodiversity to understand which of the following questions?
| 1. | Why do species prefer specific habitats? |
| 2. | Why are certain species larger than others? |
| 3. | How does the structure of plants affect their lifespan? |
| 4. | How did such a vast diversity of species arise over time? |
Subtopic: Introduction & Types | Biodiversity |
83%
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The annual net primary productivity of the whole biosphere is approximately:
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
Subtopic: Ecosystem Productivity |
87%
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Suppose in an area, the energy present in total incident sunlight falling on primary producers is 10,00,000 J and about 10,000 J is converted by them into biomass. What percent of PAR have the primary producers been able to convert?
| 1. | 1 % | 2. | 2 % |
| 3. | 10 % | 4. | 20 % |
Subtopic: Ecosystem Productivity |
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There are certain limitations of ecological pyramids which include:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | They do not take into account the same species belonging to two or more trophic levels. |
| II: | They do not accommodate a food web. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecological Pyramids |
88%
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Consider the following statements regarding energy flow in an ecosystem:
1. Only I is correct.
2. Only II is correct.
3. Both I and II are correct.
4. Neither I nor II is correct.
| I: | Energy flow in an ecosystem is unidirectional. |
| II: | Energy once lost as heat can be recycled within the ecosystem. |
2. Only II is correct.
3. Both I and II are correct.
4. Neither I nor II is correct.
Subtopic: Energy Flow |
71%
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