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Q. No.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
Subtopic: Energy Flow |
81%
Level 1: 80%+
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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 |
89%
Level 1: 80%+
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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 |
69%
Level 2: 60%+
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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
65%
Level 2: 60%+
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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 |
56%
Level 3: 35%-60%
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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 |
59%
Level 3: 35%-60%
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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 |
72%
Level 2: 60%+
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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: Ecosystem Services |
Level 4: Below 35%
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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: Nutrient Cycling |
75%
Level 2: 60%+
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Detritus food chain:
| 1. | begins with primary producers like grass |
| 2. | is the major conduit for energy flow in an aquatic ecosystem |
| 3. | is not made up of any decomposers |
| 4. | may be connected with the grazing food chain at some levels |
Subtopic: Energy Flow |
76%
Level 2: 60%+
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