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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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): | 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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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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Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted
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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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The process of mineralization by micro-organisms helps in the release of:
| 1. | Inorganic nutrients from humus |
| 2. | Both organic and inorganic nutrients from detritus |
| 3. | Organic nutrients from humus |
| 4. | Inorganic nutrients from detritus and formation of humus. |
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Identify the incorrectly matched pair:
1. Carnivores -- secondary or tertiary consumer
2. Decomposers -- microbial heterotrophs
3. Herbivores -- primary consumer
4. Omnivores -- molds, yeasts and mushrooms
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