Q. No.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.
What percent of the energy fixed by primary producers in a typical field ecosystem is received by a secondary consumer?
| 1. | 0.1% | 2. | 1% |
| 3. | 10% | 4. | 20% |
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The residual, after autotrophic respiration is subtracted from GPP, is:
| 1. | secondary productivity | 2. | net primary productivity |
| 3. | standing crop biomass | 4. | chemosynthesis |
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The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
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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.
Primary producers near deep-sea vents are:
1. Chemohetrotrophic prokaryotes
2. Chemoauotrophic prokaryotes
3. Photosynthetic prokaryotes
4. Photosynthetic autotrophs
Decomposers like fungi and bacteria are :
| i. | Autotrophs |
| ii. | Heterotrophs |
| iii. | Saptrotrophs |
| iv. | Chemo-autotrophs |
Choose the correct answer :
| 1. | i and ii | 2. | i and iv |
| 3. | ii and iii | 4. | i and iii |
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An inverted pyramid of biomass can be found in which ecosystem?
| 1. | Forest | 2. | Marine |
| 3. | Grassland | 4. | Tundra |
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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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