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Q. No.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 |
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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 |
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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 |
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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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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 |
56%
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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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Which of the following statement about GFC is incorrect?
| 1. | Sun is the source of energy |
| 2. | Begins with consumers |
| 3. | Major conduit for energy flow in aquatic ecosystems |
| 4. | Size of organisms commonly increase at higher trophic levels |
Subtopic: Energy Flow |
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Mark the incorrect match
| 1. | Primary productivity - Varies in different types of ecosystems |
| 2. | GPP - Available biomass for the consumption to herbivores |
| 3. | 55 billion tons - Annual NPP of oceans |
| 4. | Secondary productivity - Rate of formation of new organic matter by consumers |
Subtopic: Ecosystem Productivity |
62%
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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 |
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Consider the given two statements:
| Assertion (A): | Heterotrophs generally have high energy conversion efficiencies when compared to those of plants. |
| Reason (R): | At higher trophic levels, the respiratory costs are dramatically reduced. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (R) |
| 3. | Both (A) and (R) are True and but (R) does not correctly explain (A) |
| 4. | Both (A) and (R) are False |
Subtopic: Energy Flow |
52%
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