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Q. No.The nutrients in an ecosystem are:
1.
continuously lost from an ecosystem
2.
needed as a continuous supply from the outside
3.
recycled time and again indefinitely
4.
continuously synthesized by physical forces
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
80%
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The earth is regarded as “open” system with respect to:
| 1. | organisms | 2. | chemicals |
| 3. | energy | 4. | water |
Subtopic: Energy Flow |
73%
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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 |
Subtopic: Decomposition |
82%
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A chemical that enters living organisms primarily from the atmosphere is:
| 1. | phosphorus | 2. | sulfur |
| 3. | sodium | 4. | carbon |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
81%
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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. |
Subtopic: Ecosystem Productivity |
62%
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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% |
Subtopic: Energy Flow |
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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 |
Subtopic: Ecosystem Productivity |
89%
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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
Subtopic: Energy Flow |
67%
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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 |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
54%
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The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
Subtopic: Energy Flow |
65%
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