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Q. No.Consider the given two statements:
Assertion (A):
Heterotrophic bacteria are essential for recycling nutrients in the ecosystem.
Reason (R):
They decompose organic matter, releasing nutrients back into the soil and water.
1.
(A) is False but (R) is True
2.
Both (A) and (R) are True but (R) is NOT the correct explanation of (R)
3.
(A) is True but (R) is False
4.
Both (A) and (R) are True and (R) is the correct explanation of (A)
Subtopic: Ecological Flow |
89%
From NCERT
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Which process in the ecosystem is primarily responsible for the cycling of nutrients but not energy?
1. Primary production
2. Decomposition
3. Respiration
4. Photosynthesis
1. Primary production
2. Decomposition
3. Respiration
4. Photosynthesis
Subtopic: Decomposition |
90%
From NCERT
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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%
From NCERT
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Which of the following ecosystems has the highest primary productivity?
1. Tropical rainforest
2. Temperate forest
3. Coral reefs
4. Ocean
1. Tropical rainforest
2. Temperate forest
3. Coral reefs
4. Ocean
Subtopic: Ecosystem Productivity |
88%
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Secondary productivity is defined as:
| 1. | The rate at which primary producers synthesize organic material. |
| 2. | The rate at which consumers convert the biomass of primary producers into their own biomass. |
| 3. | The total biomass of an ecosystem. |
| 4. | The rate of decomposition in an ecosystem. |
Subtopic: Ecosystem Productivity |
93%
From NCERT
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Stratification in an ecosystem refers to:
| 1. | The layering of plants and animals in different heights and depths. |
| 2. | The distribution of nutrients in soil and water. |
| 3. | The cycling of matter through biotic and abiotic components. |
| 4. | The decomposition process. |
Subtopic: Components & Types of Ecosystems |
90%
From NCERT
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Ecological pyramids represent the:
| 1. | Biomass, energy, or number of organisms at each trophic level in a food chain. |
| 2. | Interaction between different species within an ecosystem. |
| 3. | Migration patterns of different species in an ecosystem. |
| 4. | Reproductive success rate across different trophic levels. |
Subtopic: Ecological Pyramids |
94%
From NCERT
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Consider the given two statements:
| Assertion (A): | In a terrestrial ecosystem, the pyramid of biomass is generally upright. |
| Reason (R): | Producers have a higher biomass than that of consumers in terrestrial ecosystems. |
Choose the correct option.
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Ecological Pyramids |
94%
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Primary productivity in an ecosystem refers to:
| 1. | The rate at which consumers produce organic material. |
| 2. | The amount of biomass produced by decomposers. |
| 3. | The rate at which producers synthesize organic material from inorganic substances. |
| 4. | The total amount of organic material available in the ecosystem. |
Subtopic: Ecosystem Productivity |
84%
From NCERT
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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%
From NCERT
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