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Q. No.Primary production is expressed in terms of weight as
1. Gram/m2
2. K cal/m2
3. Gram/m2 /year
4. Kcal/m2 /year
Subtopic: Ecosystem Productivity |
64%
From NCERT
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Select the incorrect statement
| 1. | All the steps in decomposition operate simultaneously on the humus. |
| 2. | Humus is dark colored amorphous substance |
| 3. | Humus undergoes decomposition at very slow rate |
| 4. | Humus serves as reservoir of nutrients. |
Subtopic: Decomposition |
82%
From NCERT
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Mineralisation differs from leaching as in former
| 1. | Humus is degraded by microbes to release inorganic nutrients whereas in later water soluble inorganic nutrients go down into the soil horizon. |
| 2. | Detritus is broken down whereas in later humus is degraded |
| 3. | Water soluble inorganic nutrients go down in soil and in later detritus is degraded by detrivores |
| 4. | Humus becomes colloidal and in later humus becomes detritus. |
Subtopic: Decomposition |
76%
From NCERT
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Which one is incorrectly matched?
| 1. | Carnivores | - | Secondary or tertiary consumer |
| 2. | Herbivores | - | Primary consumer |
| 3. | Decomposers | - | Microbial heterotrophs |
| 4. | Detrivores | - | Secondary consumers |
Subtopic: Energy Flow |
88%
From NCERT
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Read the following statements and select the correct option
1. Only statement I is correct
2. Only statement II is correct
3. Both statement I and II are correct
4. Both statement I and II are incorrect
| I: | The annual net primary productivity of the whole biosphere is approx 170 billion tons of organic matter. |
| II: | Majority of this is contributed by the oceans as they occupy about 70 percent of the surface. |
1. Only statement I is correct
2. Only statement II is correct
3. Both statement I and II are correct
4. Both statement I and II are incorrect
Subtopic: Ecosystem Productivity |
68%
From NCERT
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Decomposers meet their energy and nutrient requirements by
1. Converting atmospheric CO2 into sugar
2. Oxidising inorganic substances
3. Capturing solar energy
4. Degrading dead organic matter
1. Converting atmospheric CO2 into sugar
2. Oxidising inorganic substances
3. Capturing solar energy
4. Degrading dead organic matter
Subtopic: Energy Flow |
76%
From NCERT
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Subtopic: Energy Flow |
80%
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Read the following statements and select the correct option:
| A: | It is said that Detritus food chain may be connected to grazing food chain at some levels. |
| B: | Some of the organisms of DFC are prey to the GFC animals. |
| 1. | Both A and B are correct and B is correct explanation of A |
| 2. | Both A and B are correct but B is not correct explanation of A |
| 3. | Only B is correct, A is incorrect |
| 4. | Only A is correct, B is incorrect |
Subtopic: Energy Flow |
80%
From NCERT
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The standing crop is measured as
1. The amount of nutrients in a particular area
2. Mass or number of living organisms in a unit area
3. Amount of photosynthates produced by plants
4. Available net primary productivity to decomposers
1. The amount of nutrients in a particular area
2. Mass or number of living organisms in a unit area
3. Amount of photosynthates produced by plants
4. Available net primary productivity to decomposers
Subtopic: Energy Flow |
81%
From NCERT
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Identify the type of Pyramid shown in the figure. Trophic level Dry weight (kg/m2)
1. Upright pyramid of biomass in grassland ecosystem
2. Upright pyramid of biomass in pond ecosystem
3. Inverted pyramid of biomass in pond ecosystem
4. Inverted pyramid of biomass in grassland ecosystem
1. Upright pyramid of biomass in grassland ecosystem
2. Upright pyramid of biomass in pond ecosystem
3. Inverted pyramid of biomass in pond ecosystem
4. Inverted pyramid of biomass in grassland ecosystem
Subtopic: Energy Flow |
84%
From NCERT
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