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.

  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 Flow |
 73%
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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)


 
  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%
From NCERT
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Match the columns:
            Column-I                 Column-II
A. Tansley (i) Gave the term ecology
B. Ramdeo Mishra (ii) Father of ecology
C. Reiter (iii) Correctly defined ecology
D. Ernst Haeckel (iv) Gave the term ecosystem

1.  A = (i), B = (ii), C = (iii), D = (iv)

2.  A = (iv), B = (ii), C = (i), D = (iii)

3.  A = (ii), B = (i), C = (iv), D = (iii)

4.  A = (iv), B = (ii), C = (iii), D = (i)
Subtopic:  Energy Flow | Ecological Flow |
From NCERT
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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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Consider the following two statements:

l. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.
ll. Majority of this is contributed by the oceans as they occupy larger area of earth.

1. Both l and ll are correct and ll explains l

2. Both l and ll are correct but ll does not explain l

3. l is correct but ll is incorrect

4. l is incorrect but ll is correct

Subtopic:  Ecosystem Productivity |
 72%
From NCERT
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Consider the following four statements (a-d) and select the correct option stating which ones are true (T) or false (F)

a. Organisms at each trophic level depends on those at higher trophic level for their energy demands.

b. Each trophic level has a certain mass of living material at a particular time called standing crop.

c. Each trophic level has a certain mass of non-living material at a particular time called standing state.

d. The number of trophic levels in a grazing food chain is not restricted.

Options

a b c d
1. T T F F
2. F T F T
3. T F T F
4. F T T F
Subtopic:  Energy Flow |
 67%
From NCERT
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Consider the following statements
concerning food chains
i) Removal of 80% tigers from an area
   resulted in greatly increased growth of
   vegetation.
ii) Removal of most of the carnivores
    resulted in an increased population of
    deers.
iii) The length of food chains is generally
     limited to 3 – 4 trophic levels due to energy loss.
iv) The length of food chains may vary from
     2 to 8 trophic levels.

Which two of the above statements are
correct?
1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Subtopic:  Energy Flow | Ecological Flow |
 87%
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Consider the following statements concerning food chains
i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
ii) Removal of most of the carnivores resulted in an increased population of deers. 
iii) The length of food chains is generally limited to 3 – 4 trophic levels due to energy loss.
iv) The length of food chains may vary from 2 to 8 trophic levels.

Which two of the above statements are correct?

1. i and ii

2. ii and iii

3. iii and iv

4. i and iv

Subtopic:  Energy Flow |
 89%
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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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Given below are two statements 
Statement I: Standing state is the amount of inorganic nutrients found in an ecosystem and it varies on a seasonal basis 
Statement II: Standing crop is the mass of living matter in an ecosystem and it tends to be more readily apparent in terrestrial environment as compared to aquatic environment 
In light of the above statements, choose the most appropriate answer from the options given below 
1. Both Statement I and Statement II are correct 
2. Both Statement I and Statement II are incorrect 
3. Statement I is correct but Statement II is incorrect 
4. Statement I is incorrect but Statement II is correct 
Subtopic:  Components & Types of Ecosystems |
 79%
From NCERT
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