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Q. No.What is the difference between Gross Primary Productivity (GPP) and Net Primary Productivity (NPP)?
1.
GPP is the total rate of photosynthesis, including both organic matter used in respiration and biomass accumulation; NPP is only the biomass accumulation.
2.
GPP refers to the energy stored by consumers, while NPP refers to the energy stored by producers.
3.
GPP is the total biomass accumulated, while NPP is the leftover energy after plants' metabolic needs are met.
4.
NPP is always higher than GPP because it includes consumer productivity.
Subtopic: Ecosystem Productivity |
From NCERT
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About what percentage of sunlight available to them, are the primary producers able to convert into Net Primary Productivity?
1. 1
2. 5
3. 10
4. 50
1. 1
2. 5
3. 10
4. 50
Subtopic: Ecological Pyramids |
57%
From NCERT
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What percent of the incident solar radiation is photosynthetically active radiation (PAR)?
1. only about 1 to 5
2. only about 2 to 10
3. around but less than 50
4. 90 to 95
1. only about 1 to 5
2. only about 2 to 10
3. around but less than 50
4. 90 to 95
Subtopic: Components & Types of Ecosystems |
59%
From NCERT
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During decomposition, degradation of detritus into simpler inorganic substances is called:
1. Catabolism
2. Leaching
3. Chelation
4. Fragmentation
1. Catabolism
2. Leaching
3. Chelation
4. Fragmentation
Subtopic: Decomposition |
59%
From NCERT
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is:
| 1. | Primary production | 2. | Primary productivity |
| 3. | Secondary production | 4. | Secondary productivity |
Subtopic: Ecosystem Productivity |
From NCERT
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Why do ecosystems require a constant supply of energy?
| 1. | To support the cycling of matter through biotic and abiotic components. |
| 2. | To counteract the tendency toward increasing disorder, in line with the Second Law of Thermodynamics. |
| 3. | To ensure continuous reproduction of species within the ecosystem. |
| 4. | To stabilize the populations of consumers at each trophic level. |
Subtopic: Energy Flow |
62%
From NCERT
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Consider the given two statements:
| Assertion (A): | In an ecosystem, organisms are linked through food chains and food webs. |
| Reason (R): | No energy that is trapped into an organism remains in it forever. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Energy Flow |
55%
From NCERT
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Consider the given two statements:
| Assertion (A): | Ecosystems require a constant supply of energy to synthesize molecules and maintain their functioning. |
| Reason (R): | Ecosystems are not exempt from the Second Law of Thermodynamics, which states that systems tend toward increasing disorder (entropy). |
| 1. | Both (A) and (R) are True and (R) explains (A). |
| 2. | Both (A) and (R) are True but (R) does not explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Energy Flow |
55%
From NCERT
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Read the following two statements and choose the correct option:
Options:
| Statement I: | The annual net primary productivity of the entire biosphere is approximately 170 billion tons of wet fresh weight organic matter. |
| Statement II: | Oceans contribute the majority of the net primary productivity of the biosphere. |
Options:
| 1. | Both statements I and II are correct |
| 2. | Both statements I and II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Ecosystem Productivity |
53%
From NCERT
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Humification results in the formation of ---- substance
1. Colloidal, Basic
2. Acidic, Dark coloured
3. Amorphous, Light coloured
4. Light-coloured, Colloidal
1. Colloidal, Basic
2. Acidic, Dark coloured
3. Amorphous, Light coloured
4. Light-coloured, Colloidal
Subtopic: Decomposition |
51%
From NCERT
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