Q. No.Of the given two statements:
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: | A constant input of solar energy is the basic requirement for almost all ecosystems to function and sustain. |
| II: | There is unidirectional movement of energy towards the higher trophic levels and its dissipation as heat to the environment. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecosystem Productivity | Energy Flow |
94%
From NCERT
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Consider the given two statements:
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: | Primary production of an ecosystem is expressed in terms of weight (gm–2) or energy (kcal m–2). |
| II: | Productivity of an ecosystem is expressed in terms of gm–2 yr–1 or (kcal m–2) yr–1 . |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecosystem Productivity |
89%
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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Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
| 1. | ii | 2. | iii |
| 3. | ii and iv | 4. | i and iii |
Subtopic: Ecosystem Productivity |
85%
From NCERT
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In an ecosystem, the rate of production of organic matter during photosynthesis is called as its:
| 1. | Gross Primary productivity |
| 2. | Net Primary productivity |
| 3. | Secondary productivity |
| 4. | Non productivity |
Subtopic: Ecosystem Productivity |
88%
From NCERT
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Net primary productivity is the gross primary productivity minus:
| 1. | that which is consumed by herbivores |
| 2. | that which is consumed by the producer in metabolism |
| 3. | secondary productivity |
| 4. | loss due to mortality |
Subtopic: Ecosystem Productivity |
84%
From NCERT
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The annual net primary productivity of whole biosphere is approximately:
| 1. | 25 billion tons | 2. | 55 billion tons |
| 3. | 70 billion tons | 4. | 170 billion tons |
Subtopic: Ecosystem Productivity |
86%
From NCERT
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Which of the following ecosystems is most productive in terms of net primary production?
| 1. | Deserts | 2. | Tropical rainforests |
| 3. | Oceans | 4. | Estuaries |
Subtopic: Ecosystem Productivity |
85%
From NCERT
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The rate of formation of new organic matter by consumers in an ecosystem is known as:
| 1. | Gross Primary productivity |
| 2. | Net Primary productivity |
| 3. | Secondary productivity |
| 4. | Non-productivity |
Subtopic: Ecosystem Productivity |
82%
From NCERT
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What approximate percentage of the annual net primary productivity of the whole biosphere is the net primary productivity of oceans?
1. 25
2. 33
3. 66
4. 70
1. 25
2. 33
3. 66
4. 70
Subtopic: Ecosystem Productivity |
61%
From NCERT
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