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Q. No.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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Identify the incorrect statement regarding primary productivity in an ecosystem?
| 1. | It occurs only through the process of photosynthesis. |
| 2. | Almost all life on Earth relies directly or indirectly on primary production. |
| 3. | Net primary production is available for consumption by herbivores. |
| 4. | Gross primary productivity minus the respiratory loss is the net primary productivity. |
Subtopic: Ecosystem Productivity |
57%
From NCERT
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The net primary productivity of oceans is about:
| 1. | 25 % of the annual net primary productivity of the whole biosphere |
| 2. | 33 % of the annual net primary productivity of the whole biosphere |
| 3. | 66 % of the annual net primary productivity of the whole biosphere |
| 4. | 70 % of the annual net primary productivity of the whole biosphere |
Subtopic: Ecosystem Productivity |
58%
From NCERT
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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 |
61%
From NCERT
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Which of the following ecosystems are expected to have the least productivity?
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
Subtopic: Ecosystem Productivity |
From NCERT
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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 |
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 |
52%
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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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
Subtopic: Ecosystem Productivity |
57%
From NCERT
NEET - 2022
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
During the decomposition of detritus, the correct chronological sequence of steps involved is:
| 1. | Fragmentation → Leaching → Catabolism |
| 2. | Catabolism → Leaching → Fragmentation |
| 3. | Leaching → Fragmentation → Catabolism |
| 4. | There is no sequence as all steps occur simultaneously |
Subtopic: Decomposition |
From NCERT
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