Q. No.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
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 |
The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
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Early seral communities in secondary succession are less productive than in later stages because:
| 1. | early seral communities are prone to invasion and disturbance by other species of plants |
| 2. | low biomass means less productivity |
| 3. | weedy early seral communities make habitat inhospitable for more productive species |
| 4. | early seral stages are more sensitive to nutrient deficiencies |
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