Q. No.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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An important feature of the phosphorus cycle is that its reservoir is in:
1. aquifers
2. soil and rocks
3. the atmosphere
4. the sun
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In an open ocean, the pyramid of biomass is often inverted. How can this support higher trophic levels?
| 1. | The food produced by primary producers is of high quality |
| 2. | The primary producers grow and reproduce at high rates |
| 3. | Primary producers are very abundant. |
| 4. | The predators at higher trophic levels are very efficient |
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| Assertion (A): | Lichens are commonly the pioneer species during primary succession on rocks. |
| Reason (R): | Lichens are able to secrete acids to dissolve rocks. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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| Assertion (A): | Saprophytes play a vital role in the ecosystem. |
| Reason (R): | Saprophytes are accorded the highest trophic level in a food chain or a food web. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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| Assertion (A): | Some aquatic ecosystems have inverted biomass pyramids. |
| Reason (R): | The pyramid of energy is also inverted in such ecosystems. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
| 1. | Scavenger | 2. | Tertiary producer |
| 3. | Tertiary consumer | 4. | Secondary consumer |
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Climax community is in a state of :
1. Non-equilibrium
2. Equilibrium
3. Disorder
4. Constant change
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During the process of ecological succession, the changes that take place in communities are :
1. Orderly and sequential
2. Random
3. Very quick
4. Not influenced by the physical environment
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Among the following, where do you think the process of decomposition would be the fastest?
| 1. | Tropical rain forest | 2. | Antarctic |
| 3. | Dry arid region | 4. | Alpine region |
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