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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What percentage of photosynthetic active radiation is captured by plants?
1. | 1 – 5 | 2. | 2 – 10 |
3. | 50 | 4. | 90 |
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Primary carnivores are, most aptly, characterized as:
1. | Secondary producers | 2. | Primary consumers |
3. | Secondary consumers | 4. | Tertiary consumers |
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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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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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The entire sequence of communities that successively change in a given area are called:
1. Taxa
2. Seres
3. Pioneers
4. Climax
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