Q. No.Identify the incorrectly matched pair:
|
1. |
Vertical distribution of different species occupying different levels |
Stratification |
|
2. |
Mass of living material at a particular time at each trophic level |
Standing crop |
|
3. |
Rate of formation of new organic matter by consumers |
Net primary productivity |
|
4. |
The rate of production of organic matter during photosynthesis |
Gross primary productivity |
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The productivity in an aquatic ecosystem is least likely to be limited by:
| 1. | nitrogen | 2. | carbon |
| 3. | phosphorus | 4. | iron |
Which of the following is most likely to exhibit the maximum difference between GPP and NPP?
1. phytoplankton in the ocean.
2. corn plants in a farmerʹs field.
3. prairie grasses.
4. an oak tree in a forest.
Unlike terrestrial ecosystems, the majority of primary production in the ocean is:
| 1. | not dependent on the Sun as the source of energy |
| 2. | performed by phytoplankton |
| 3. | not limited by the availability of nitrogen |
| 4. | not important from a global perspective |
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Which of the following ecosystems is most productive in terms of net primary production?
| 1. | Deserts | 2. | Tropical rainforests |
| 3. | Oceans | 4. | Estuaries |
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The rate of formation of new organic matter by consumers in an ecosystem is known as:
1. Gross Primary productivity
2. Net Primary productivity
3. Secondary productivity
4. Non-productivity
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A herbivore eats 4,000 J of plant material. 2200 J is indigestible and is eliminated as feces. 1,600 J are used in cellular respiration. What is the approximate production efficiency of this animal?
| 1. | 1% | 2. | 5% |
| 3. | 10% | 4. | 50% |
The generation of biomass of heterotrophic (consumer) organisms in a system is termed:
| 1. | biogeochemical cycles | 2. | net primary productivity |
| 3. | gross primary productivity | 4. | secondary productivity |
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Consider the following statements:
| I: | The rate of production of organic matter during photosynthesis is called as gross primary productivity of an ecosystem. |
| II: | The available biomass for the consumption of heterotrophs is called secondary productivity. |
| III: | The low productivity of the oceans can mainly be attributed to the limited availability of nitrogen. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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What is the best description of trophic efficiency?
| 1. | the ratio of net secondary production to the assimilation of primary production. |
| 2. | the percentage of production transferred from one trophic level to the next. |
| 3. | a measure of how nutrients are cycled from one trophic level to the next. |
| 4. | usually greater than production efficiencies. |
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