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Q. No.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 |
63%
From NCERT
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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 |
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 |
85%
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A chemical that enters living organisms primarily from the atmosphere is:
| 1. | phosphorus | 2. | sulfur |
| 3. | sodium | 4. | carbon |
81%
From NCERT
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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%
1. 0.1%
2. 1%
3. 10%
4. 20%
Subtopic: Energy Flow |
From NCERT
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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 |
90%
From NCERT
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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%
From NCERT
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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 |
54%
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