Q. No.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 rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances is called as:
1. biomass
2. transpiration
3. net primary productivity
4. gross primary productivity
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The chemical energy that is not converted to new biomass in the process of energy transfer between trophic levels in an ecosystem is finally:
1. removed in the feces
2. recycled by decomposers
3. used by heterotrophs to thermoregulate.
4. dissipated into space as heat
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Aquatic ecosystems that are most adversely affected by acid are those that lack:
1. calcium
2. carbonic acid
3. nitrate
4. bicarbonate
The largest net primary production of the Earth is contributed by:
1. savanna
2. salt marsh
3. open ocean
4. tropical rainforest
An example of primary succession would be:
| 1. | Soil formation in the crater of an extinct volcano |
| 2. | Growth of a pine forest after a fire |
| 3. | Restoration of grass on a former agricultural field |
| 4. | Starfish colonizing on a coral reef |
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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Energy and nutrients enter an ecosystem and hence in a community through:
1. Producers
2. Consumers
3. Detritivores
4. Apex predators
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The prime driving force for the water cycle is:
| 1. | evapotranspiration from plants |
| 2. | rainfall |
| 3. | snowmelt |
| 4. | percolation of water through the soil |
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