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Q. No.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 |
86%
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 |
67%
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) |
65%
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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%
From NCERT
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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 |
74%
From NCERT
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Which of the following statements regarding ecological succession is/are true?
| I. | The change in communities during ecological succession is orderly and sequential, parallel with the changes in the physical environment. |
| II. | Secondary succession is faster than primary succession. |
| III. | Usually, lichens are pioneer species during primary xerarch succession. |
| 1. | Only I |
| 2. | Only II |
| 3. | Both I and III |
| 4. | I, II and III |
Subtopic: Ecological Succession (OLD NCERT) |
87%
From NCERT
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