Why is net primary production (NPP) a more useful measurement to an ecosystem ecologist than gross primary production (GPP)?
1. NPP can be expressed in energy/unit of area/unit of time
2. NPP can be expressed in terms of carbon fixed by photosynthesis for an entire ecosystem
3. NPP represents the stored chemical energy that is available to consumers in the ecosystem
4. NPP is the same as the standing crop
Subtopic: Â Energy Flow |
 78%
Level 2: 60%+
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Why is net primary production (NPP) a more useful measurement to an ecosystem ecologist than gross primary productivity (GPP)?
1. NPP can be expressed in energy/unit of area/unit of time.
2. NPP can be expressed in terms of carbon fixed by photosynthesis for an entire ecosystem.
3. NPP represents the stored chemical energy that is available to consumers in the ecosystem.
4. NPP is the same as the standing crop
Subtopic: Â Ecosystem Productivity |
 80%
Level 1: 80%+
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Consider the two statements:
| Assertion (A): | Energy flow in ecosystem is bidirectional. |
| Reason (R): | Energy goes on increasing with each and every trophic level. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Energy Flow |Â Ecological Pyramids |
 91%
Level 1: 80%+
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An ecosystem which can be easily damaged but can recover if damaging effects stop, will be having
1. Low stability and high resilience
2. High stability and low resilience
3. High stability and high resilience
4. Low stability and low resilience
1. Low stability and high resilience
2. High stability and low resilience
3. High stability and high resilience
4. Low stability and low resilience
Subtopic: Â Components & Types of Ecosystems |Â Ecosystem Productivity |
 62%
Level 2: 60%+
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Consider the following statements with respect to food chain
A. Removal of 80% tigers from an area resulted in increased growth of vetetation
B. Removal of most of the carnivores resulted in increased growth of vegetation
C. The length of food chain is generally limited to 3-4 tropic levels due to energy loss
D. The length of food chains may vary from 208 trophic levels
Choose the correct answer from the options given below:
1. A, D
2. A, B
3. B, C
4. C, D
A. Removal of 80% tigers from an area resulted in increased growth of vetetation
B. Removal of most of the carnivores resulted in increased growth of vegetation
C. The length of food chain is generally limited to 3-4 tropic levels due to energy loss
D. The length of food chains may vary from 208 trophic levels
Choose the correct answer from the options given below:
1. A, D
2. A, B
3. B, C
4. C, D
Subtopic: Â Energy Flow |
 70%
Level 2: 60%+
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What percentage of photosynthetically active radiation is captured by plants?
1. 2-10%
2. 50%
3. 100%
4. 1-2%
1. 2-10%
2. 50%
3. 100%
4. 1-2%
Subtopic: Â Ecosystem Productivity |
 83%
Level 1: 80%+
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At each trophic level, a certain mass of living material at a particular time is known as
1. Dry weight
2. Standing crop
3. Fresh weight
4. Standing state
1. Dry weight
2. Standing crop
3. Fresh weight
4. Standing state
Subtopic: Â Energy Flow |
 90%
Level 1: 80%+
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Arrange the following, starting from first trophic level
A. Molluscs
B. Hydrilla
C. Snake
D. Hawk
E. Fish
Choose the correct answer from the options given below
1. A, B, C, D, E
2. B, A, C, D, E
3. B, A, E , C, D
4. B, A, E, D, C
A. Molluscs
B. Hydrilla
C. Snake
D. Hawk
E. Fish
Choose the correct answer from the options given below
1. A, B, C, D, E
2. B, A, C, D, E
3. B, A, E , C, D
4. B, A, E, D, C
Subtopic: Â Energy Flow |
 75%
Level 2: 60%+
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Community is an aggregation of
1. Individuals of the same kind
2. Populations of different species
3. Individuals of a population
4. Individuals of different kinds
1. Individuals of the same kind
2. Populations of different species
3. Individuals of a population
4. Individuals of different kinds
Subtopic: Â Introduction |
 78%
Level 2: 60%+
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Match List I with List II
Choose the correct answer from the options given below:
1. A-IV, B-I, C-II, D-III
2. A-IV, B-II, C-I, D-III
3. A-III, B-IV, C-I, D-II
4. A-II, B-I, C-IV, D-III
| List I | List II |
| A. Lichens | I. Pioneer species |
| B. Invade bare area | II. Hydrosere |
| C. Reed swamp stage | III. Final stable community |
| D. Climax | IV. Lithosere |
1. A-IV, B-I, C-II, D-III
2. A-IV, B-II, C-I, D-III
3. A-III, B-IV, C-I, D-II
4. A-II, B-I, C-IV, D-III
 76%
Level 2: 60%+
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