Q. No.| 1. | A population | 2. | A species |
| 3. | A biological community | 4. | An ecosystem |
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| Statement I: | Entire biosphere is regarded as a global ecosystem by many ecologists. |
| Statement II: | The global ecosystem is divided into terrestrial and aquatic ecosystem for convenience. |
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
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Energy flow and nutrient cycling are two important components of an ecosystem. What will be true comparison of the two?
| 1. | The amount of energy is much greater than the amount of nutrients |
| 2. | Organisms always need nutrients, but they don't always need energy |
| 3. | Nutrients are recycled, but energy is not |
| 4. | Organisms always need energy, but they don't always need nutrients |
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| 1. | Stratification | 2. | Scarification |
| 3. | Standing crop | 4. | Standing state |
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| Statement I: | There is unidirectional movement of energy towards the higher trophic levels and its dissipation and loss as heat to the environment. |
| Statement II: | Nutrients are never lost from the ecosystems, rather they are recycled time and again indefinitely. |
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
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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 |
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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
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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 |
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Secondary productivity in an ecosystem can be defined as:
| 1. | The amount of chemical energy, typically expressed as carbon biomass, that primary producers create in a given length of time. |
| 2. | The rate at which all the autotrophs in an ecosystem produce net useful chemical energy. |
| 3. | The rate of formation of new organic matter by consumers. |
| 4. | The amount of energy released by the action of detritivores and decomposers in an ecosystem. |
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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 |
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