Q. No.The detritus food chain:
I:
begins with dead organic matter
II:
is the major conduit of energy flow in aquatic ecosystem.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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In a terrestrial ecosystem, a much larger fraction of energy flows through the:
| 1. | DFC | 2. | GFC |
| 3. | Either of DFC or GFC | 4. | Nither of DFC nor GFC |
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In an aquatic food chain, zooplankton occupy which trophic level?
| 1. | First | 2. | Second |
| 3. | Third | 4. | Fourth |
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Organisms at each trophic level depend on those at the lower level trophic level for their energy demands except:
| 1. | Primary consumers | 2. | Secondary consumers |
| 3. | Tertiary consumers | 4. | Decomposers |
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Each trophic level has a certain mass of living material at a particular time, best called as:
| 1. | Biomass | 2. | Standing state |
| 3. | Standing crop | 4. | Gross productivity |
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Approximately, what percent of energy is transferred to each trophic level from the lower trophic level in an ecosystem?
| 1. | 1 | 2. | 10 |
| 3. | 50 | 4. | 90 |
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Identify the correct statements:
| I: | Only a few individuals can be taken into account at any trophic level and the deductions may be generalised. |
| II: | Trophic level is a functional level and does not represent a species. |
| III: | A given species may occupy more than one trophic level in the same ecosystem at the same time. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, III and IV |
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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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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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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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