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Q. No.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 |
67%
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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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A species when defined in terms of the total interactions of all its members with the nonliving and living part of the environment, in a specific area, is known as
1. Biological species concept
2. Ecological species concept
3. Morphological species concept
4. Interactive species concept
1. Biological species concept
2. Ecological species concept
3. Morphological species concept
4. Interactive species concept
Subtopic: Introduction |
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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
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 |
74%
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Find out the correct sequence in hydrosere
A. Hydrilla
B. Oak
C. Scirpus
D. Volvox
E. Pistia
Choose the correct answer from the options given below
1. A, B, C, D, E
2. B, C, D, E, A
3. D, A, E, C, B
4. C, D, E, A, B
A. Hydrilla
B. Oak
C. Scirpus
D. Volvox
E. Pistia
Choose the correct answer from the options given below
1. A, B, C, D, E
2. B, C, D, E, A
3. D, A, E, C, B
4. C, D, E, A, B
Subtopic: Ecological Succession (OLD NCERT) |
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Which of the following are major natural mechanisms for the breakdown of chemicals in the environment?
A. Degradation by sunlight
B. Auto-halogenation
C. Microbial degradation
D. Auto-phosphorylation
E. Auto-oxidation
Choose the correct answer from the options given below
1. A, C and D only
2. B, D and E only
3. A, C and E only
4. A, B and D only
A. Degradation by sunlight
B. Auto-halogenation
C. Microbial degradation
D. Auto-phosphorylation
E. Auto-oxidation
Choose the correct answer from the options given below
1. A, C and D only
2. B, D and E only
3. A, C and E only
4. A, B and D only
Subtopic: Decomposition | Mineral Cycling & Ecosystem Services (OLD NCERT) |
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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 | Ecological Succession (OLD NCERT) |
76%
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On the basis of the proportion mineral particles of different sizes in soil represents its texture. Mineral particles in soil vary greatly in size
A. between 0.2 mm and 2 mm - coarse sand
B. Between 0.02 mm and 0.02 mm and 0.2 mm fine sand
C. less than 0.002 mm - clay
D. between 2.0 mm and 2.0 mm - slit
Choose the correct answer from the options given below:
1. A, D, C only
2. A, B only
3. B & C only
4. A, B, C only
A. between 0.2 mm and 2 mm - coarse sand
B. Between 0.02 mm and 0.02 mm and 0.2 mm fine sand
C. less than 0.002 mm - clay
D. between 2.0 mm and 2.0 mm - slit
Choose the correct answer from the options given below:
1. A, D, C only
2. A, B only
3. B & C only
4. A, B, C only
Subtopic: Components & Types of Ecosystems |
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