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Q. No.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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Identify the correct set of statements with regard to the properties of humus.
| (a) | Highly resistant to microbial action |
| (b) | Dark-colored amorphous substance |
| (c) | End product of detritus food chain |
| (d) | Reservoir of nutrients |
| (e) | Undergoes decomposition very fast |
Choose the correct answer from the options given below:
1. (a), (b), and (d) only
2. (a),(b) and (e) only
3. (a) and (b) only
4. (b), (c), and (a)
Subtopic: Decomposition |
83%
Level 1: 80%+
NEET - 2022
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