Q. No.The earth is regarded as “open” system with respect to:
1.
organisms
2.
chemicals
3.
energy
4.
water
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If decomposers go extinct on Earth:
| 1. | Detritivores will replace them |
| 2. | Primary production will increase |
| 3. | Nutrients will accumulate in dead plants and animals |
| 4. | There will be no effect on carnivores |
A chemical that enters living organisms primarily from the atmosphere is:
| 1. | phosphorus | 2. | sulfur |
| 3. | sodium | 4. | carbon |
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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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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
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