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Q. No.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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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 |
87%
Level 1: 80%+
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Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:
| Statement I: | Decomposition is a process in which the detritus is degraded into simpler substances by microbes. |
| Statement II: | Decomposition is faster if the detritus is rich in lignin and chitin. |
In light of the above statements, choose the correct answer from the options given below:
| 1. | Statement I is incorrect but Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct but Statement II is incorrect. |
Subtopic: Decomposition |
77%
Level 2: 60%+
NEET - 2022
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Which one of the following will accelerate phosphorus cycle?
1. Rainfall and storms
2. Burning of fossil fuels
3. Volcanic activity
4. Weathering of rocks
80%
Level 1: 80%+
NEET - 2022
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Detritivores breakdown detritus into smaller particles. This process is called:
| 1. Decomposition | 2. Catabolism |
| 3. Fragmentation | 4. Humification |
Subtopic: Decomposition |
80%
Level 1: 80%+
NEET - 2022
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