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Q. No.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: Energy Flow | 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: Components & Types of Ecosystems | Ecosystem Productivity |
63%
Level 2: 60%+
Please attempt this question first.
Hints
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 |
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: Ecosystem Productivity |
83%
Level 1: 80%+
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Please attempt this question first.
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%
Level 1: 80%+
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Please attempt this question first.
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: 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: Introduction |
78%
Level 2: 60%+
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Hints
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
78%
Level 2: 60%+
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Subtopic: Introduction |
77%
Level 2: 60%+
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Hints
Choose the correct statements
A. Length of the food chain is generally limited to 3-4 trophic levels due to energy loss.
B. Length of food chain depends upon the producer
C. In hydrarch succession, lichen is the pioneer community
D. Removal of most of the carnivores in an ecosystem results in an increased population of deer
E. Removal of 80% of top carnivores results in greatly increased growth of vegetation
Choose the correct answer from the options given below
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B and D only
A. Length of the food chain is generally limited to 3-4 trophic levels due to energy loss.
B. Length of food chain depends upon the producer
C. In hydrarch succession, lichen is the pioneer community
D. Removal of most of the carnivores in an ecosystem results in an increased population of deer
E. Removal of 80% of top carnivores results in greatly increased growth of vegetation
Choose the correct answer from the options given below
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B and D only
Subtopic: Energy Flow | Ecological Pyramids |
66%
Level 2: 60%+
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