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Q. No.Suppose in an area, the energy present in total incident sunlight falling on primary producers is 10,00,000 J and about 10,000 J is converted by them into biomass. What percent of PAR have the primary producers been able to convert?
1.
1 %
2.
2 %
3.
10 %
4.
20 %
Subtopic: Ecosystem Productivity |
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In an ecosystem, during decomposition, bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called as:
| 1. | Fragmentation | 2. | Leaching |
| 3. | Catabolism | 4. | Humification |
Subtopic: Decomposition |
73%
From NCERT
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The study of Ecology begins at the level of a/an:
| 1. | Organism | 2. | Population |
| 3. | Cell | 4. | Biomolecules |
Subtopic: Introduction |
64%
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Which of the following features characterizes humus?
1. Easily broken down by microbes
2. Rapid decomposition
3. Acts as a reservoir of nutrients
4. Forms very rapidly
1. Easily broken down by microbes
2. Rapid decomposition
3. Acts as a reservoir of nutrients
4. Forms very rapidly
Subtopic: Decomposition |
91%
From NCERT
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The process of decomposition is expected to occur at the fastest rate in:
1. Tropical rain forest
2. Siberia
3. Dry arid conditions
4. Alpine region
1. Tropical rain forest
2. Siberia
3. Dry arid conditions
4. Alpine region
Subtopic: Decomposition |
89%
From NCERT
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Consider the given two statements:
| Assertion (A): | Organisms at each trophic level depend on those at the lower trophic level for their energy demands. |
| Reason (R): | The amount of energy decreases at successive trophic levels. |
| 1. | Both (A) and (R) are true and (R) correctly explains the (A). |
| 2. | (A) is true but (R) is false |
| 3. | (A) is false but (R) is true |
| 4. | Both (A) and (R) are true but (R) does not correctly explain the (A). |
Subtopic: Energy Flow |
61%
From NCERT
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About what per cent of the energy in the sunlight, available to them, primary producers can convert into Net Primary Productivity (NPP)?
1. 1
2. 10
3. 50
4. 90
1. 1
2. 10
3. 50
4. 90
Subtopic: Ecological Pyramids |
56%
From NCERT
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The second vertical strata in an ecosystem is usually occupied by:
1. herbivores
2. trees
3. shrubs
4. grasses
1. herbivores
2. trees
3. shrubs
4. grasses
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
73%
From NCERT
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The functions of any ecosystem and of the biosphere as a whole include:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | conversion of inorganic into organic material, with the help of the radiant energy of the sun, by the autotrophs |
| II: | consumption of the autotrophs by heterotrophs; |
| III: | decomposition and mineralization of the dead matter to release them back for reuse by the autotrophs. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
83%
From NCERT
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The annual net primary productivity of the whole biosphere is approximately:
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
Subtopic: Ecosystem Productivity |
87%
From NCERT
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