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Q. No.Assertion: In a food chain, members of successive higher levels are fewer in number.
Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
1. Both Assertion & Reason are true and Reason is the correct explanation of Assertion
2. Both Assertion & Reason are true but Reason is not the correct explanation of Assertion
3. Assertion is true statement but Reason is false.
4. Both Assertion and Reason are false statements.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
1. Both Assertion & Reason are true and Reason is the correct explanation of Assertion
2. Both Assertion & Reason are true but Reason is not the correct explanation of Assertion
3. Assertion is true statement but Reason is false.
4. Both Assertion and Reason are false statements.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Energy Flow | Ecological Flow |
72%
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Which of the following is true of detrivores?
1. They recycle chemical elements directly back to primary consumers
2. They synthesize organic molecules that are used by primary producers
3. They convert organic materials from all trophic levels to inorganic compounds usable by primary producers
4. They secrete enzymes that convert the organic molecules of detritus into CO2 and H2O
1. They recycle chemical elements directly back to primary consumers
2. They synthesize organic molecules that are used by primary producers
3. They convert organic materials from all trophic levels to inorganic compounds usable by primary producers
4. They secrete enzymes that convert the organic molecules of detritus into CO2 and H2O
Subtopic: Decomposition |
67%
From NCERT
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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
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: Energy Flow |
77%
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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: Ecosystem Productivity |
80%
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A:
Energy flow in ecosystem is bidirectional.
R: Energy goes on increasing with each and every trophic level.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Energy goes on increasing with each and every trophic level.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Energy Flow | Ecological Pyramids |
91%
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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: Components & Types of Ecosystems | Ecosystem Productivity |
62%
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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: Energy Flow |
66%
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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: Ecosystem Productivity |
80%
From NCERT
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Subtopic: Introduction |
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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: Energy Flow |
90%
From NCERT
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