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Q. No.In primary hydrarch succession, the seral stage just before the climax forest is likely to be:
1. Submerged free floating plant stage
2. Scrub stage
3. Marsh meadow stage
4. Reed swamp stage
Subtopic: Ecological Succession (OLD NCERT) |
68%
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Identify the correct statement:
I. PAR designates the spectral range of solar radiation from 400 to 700 nanometers
II. PAR is less than 50% of the incident solar radiation
III. Plants capture only 2 to 10% of PAR
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
I. PAR designates the spectral range of solar radiation from 400 to 700 nanometers
II. PAR is less than 50% of the incident solar radiation
III. Plants capture only 2 to 10% of PAR
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Energy Flow |
79%
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The trophic level of an organism is the number of steps it is from the start of the food chain. The Level 2 typically will be occupied by:
| 1. | Primary producer | 2. | Herbivore |
| 3. | Carnivore | 4. | Apex predator |
Subtopic: Energy Flow |
87%
From NCERT
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If plants convert about 1% of the sunlight they receive into chemical energy, the total energy originally present in the incident sunlight that is finally embodied in a tertiary consumer is about:
1. 0.1%
2. 0.01%
3. 0.001%
4. 0.0001%
1. 0.1%
2. 0.01%
3. 0.001%
4. 0.0001%
Subtopic: Energy Flow |
68%
From NCERT
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Consider the following facts regarding nutrient cycling:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I. | Carbon cycle | Atmosphere only contains 10 % of total global carbon. |
| II. | Phosphorus cycle | Respiratory release of phosphorus into atmosphere is absent. |
| III. | Nitrogen cycle | Only prokaryotes are capable of carrying out biological nitrogen fixation. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
66%
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Regarding energy flow in an ecosystem:
| 1. | About 2 to 10 % of incident solar radiation is PAR |
| 2. | An ecosystem is exempt from the Second Law of Thermodynamics |
| 3. | The amount of energy increases at successive trophic levels |
| 4. | The number of trophic levels in a grazing food chain is limited |
Subtopic: Energy Flow |
52%
From NCERT
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The net primary productivity of oceans is about:
| 1. | 25 % of the annual net primary productivity of the whole biosphere |
| 2. | 33 % of the annual net primary productivity of the whole biosphere |
| 3. | 66 % of the annual net primary productivity of the whole biosphere |
| 4. | 70 % of the annual net primary productivity of the whole biosphere |
Subtopic: Ecosystem Productivity |
56%
From NCERT
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Which of the following seral stages represents the stage that is seen in a typical primary hydrarch succession just before the establishment of final forest stage?
1. Marsh-meadow stage
2. Scrub stage
3. Reed-swamp stage
4. Submerged free-floating plant stage
1. Marsh-meadow stage
2. Scrub stage
3. Reed-swamp stage
4. Submerged free-floating plant stage
Subtopic: Ecological Succession (OLD NCERT) |
72%
From NCERT
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Of the total cost of various ecosystem services, the cost of climate regulation and habitat for wildlife is about:
1. 6 %
2. 10 %
3. 12 %
5. 50 %
1. 6 %
2. 10 %
3. 12 %
5. 50 %
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
From NCERT
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What would be true for the phosphorus cycle in an ecological ecosystem?
| 1. | A considerable amount of phosphorus enters the biosphere through the primary producers. |
| 2. | Fossil fuels represent the major reservoir of phosphorus. |
| 3. | Phosphorus cycling occurs through the atmosphere, ocean, and through living and dead organisms. |
| 4. | There is no respiratory release of phosphorus into the atmosphere. |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
76%
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