Q. No.| 1. | A population | 2. | A species |
| 3. | A biological community | 4. | An ecosystem |
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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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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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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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By process of leaching during decomposition of detritus, water soluble :
| 1. | organic nutrients go down the soil horizon and get precipitated as available salts |
| 2. | inorganic nutrients go down the soil horizon and get precipitated as unavailable salts |
| 3. | organic nutrients go down the soil horizon and get precipitated as available salts |
| 4. | inorganic nutrients go down the soil horizon and get precipitated as available salts |
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The three steps of decomposition occur:
1. sequentially, with catabolism being the last step.
2. sequentially, with leaching being the last step.
3. simultaneously.
4. sequentially, but not in a particular order.
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Decomposition of detritus is rapid when:
1. It is rich in lignin and chitin
2. Ambient temperature is low
3. Environment favours anaerobiosis
4. It predominantly contains nitrogen and sugars
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