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)


 
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Energy Flow | Ecological Pyramids |
 91%
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Match List I with List II 
List I List II
A. Primary consumers I. Top carnivore
B. Tertiary consumers II. Herbivore
C. Producers III. Carnivore
D. Secondary consumers IV. Plants 

Choose the correct answer from the options given below: 
1. A-III , B-I, C-IV, D-II
2.  A-II , B-I, C-IV, D-III
3. A-II , B-III, C-I, D-IV
4.  A-III , B-II, C-IV, D-I
Subtopic:  Ecological Pyramids |
 92%
From NCERT
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Which of the following statements are correct with respect to ecological pyramids ? 
A. The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top-level consumer 
B. The pyramid of energy is always upright 
C. A given species can occupy  only one trophic level in the same ecosystem at the same time 
D. The pyramid of number in tree ecosystem is upright 
E. Saprophytes are not given any place in ecological pyramids 
Choose the correct answer from the options given below: 
1. A, B, C only 
2. A, C, D, E only 
3. B, D only 
4. A, B, E only 
Subtopic:  Ecological Pyramids |
 82%
From NCERT
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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
Subtopic:  Energy Flow | Ecological Pyramids |
 66%
From NCERT
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Assertion(A): The biomass of fishes far exceeds that of phytoplankton in sea.
Reason(R): The pyramid of biomass in sea is generally inverted.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Ecological Pyramids |
 51%
From NCERT
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Assertion(A): The pyramid of energy is always upright.
Reason(R): When energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Ecological Pyramids |
 91%
From NCERT
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