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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Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted
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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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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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Climax community is in a state of :
1. Non-equilibrium
2. Equilibrium
3. Disorder
4. Constant change
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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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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. |
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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): | 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. |
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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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