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Q. No.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
Subtopic: Energy Flow |
77%
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Subtopic: Energy Flow |
78%
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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 |
81%
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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Select true(T) or false(F) for the given statements and choose the correct option.
| A: | Any calculations of energy content, biomass or numbers has to include all organisms at the trophic level |
| B: | A given species occupies only one trophic level in the same ecosystem at the same time. |
| A | B | |
| 1. | T | T |
| 2. | T | F |
| 3. | F | T |
| 4. | F | F |
Subtopic: Ecological Pyramids |
71%
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A forest has completely wiped out by the fire, after a long time grasses appeared and then large trees. This may be due to
1. Reforestation
2. Leaching of nutrients
3. Secondary succession
4. Primary succession
1. Reforestation
2. Leaching of nutrients
3. Secondary succession
4. Primary succession
Subtopic: Ecological Succession (OLD NCERT) |
77%
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Secondary succession is faster than primary succession because
1. Some lower plants are already present
2. Soil formation is faster
3. Some higher plants are left
4. Some soil or sediment is already present
1. Some lower plants are already present
2. Soil formation is faster
3. Some higher plants are left
4. Some soil or sediment is already present
Subtopic: Ecological Succession (OLD NCERT) |
75%
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Standing state does not vary in
1. Same kind of ecosystem
2. Different kinds of ecosystem
3. Different kinds of soil
4. Different kinds of environmental factors
1. Same kind of ecosystem
2. Different kinds of ecosystem
3. Different kinds of soil
4. Different kinds of environmental factors
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
68%
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The rate of release of nutrients into the atmosphere is regulated by
(a) pH
(b) Moisture
(c) Temperature
(d) Soil
1. Only c and d
2. Only d .
3. Only band c
4. All a, b, c and d
(a) pH
(b) Moisture
(c) Temperature
(d) Soil
1. Only c and d
2. Only d .
3. Only band c
4. All a, b, c and d
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
82%
From NCERT
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