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Q. No.A physical structure that is characteristic of each type of ecosystem is due to:
1.
Interaction between various biotic components of the ecosystem
2.
Interaction between various abiotic components of the ecosystem
3.
Interaction between various biotic and abiotic components of the ecosystem
4.
Interaction of producers with abiotic components of the ecosystem
Subtopic: Introduction |
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Stratification of an ecosystem means:
| 1. | Vertical distribution of different species occupying different levels |
| 2. | Vertical distribution of different species occupying the same levels |
| 3. | Horizontal distribution of different species occupying different levels |
| 4. | Horizontal distribution of different species occupying the same levels |
Subtopic: Introduction |
85%
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The rate of formation of new organic matter by consumers in an ecosystem is known as:
| 1. | Gross Primary productivity |
| 2. | Net Primary productivity |
| 3. | Secondary productivity |
| 4. | Non-productivity |
Subtopic: Ecosystem Productivity |
81%
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Organisms that are capable of conversion of inorganic material into organic material with the help of the radiant energy of the sun include:
| I: | Plants |
| II: | Photosynthetic bacteria |
| III: | Chemosynthetic bacteria |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II, and III |
Subtopic: Introduction |
61%
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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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