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 

Subtopic:  Energy Flow |
 69%
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% 
Subtopic:  Ecosystem Productivity |
 81%
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 
Subtopic:  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 
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
Subtopic:  Introduction |
 78%
Level 2: 60%+
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Match List I with List II
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
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
 
 78%
Level 2: 60%+
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The term "Ecosystem" was proposed by
1.  E.P. Odum
2.  A.G. Tansley
3.  E. Haeckel
4.  R. Mishra
Subtopic:  Introduction |
 77%
Level 2: 60%+
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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%
Level 2: 60%+
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Given below are two statements
Statement I: The pyramid of energy is always  upright, can never be inverted
Statement II: When energy flows from one trophic level to next trophic level, some energy is always lost as heat

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:  Energy Flow |
 92%
Level 1: 80%+
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Decomposition
A. is favored by warm and dry environment
B. gives rise to humus and inorganic nutrients
C. is dependent on oxygen availability
D. involves fragmentation, catabolism and leaching
E. is faster when detritus is low in nitrogen and sugars
Choose the correct answer from the options given below:
1. A. B, C & D only
2. B, C, D & E only
3. B, C & D only
4. A, C & E only 
Subtopic:  Decomposition |
 61%
Level 2: 60%+
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