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Q. No.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
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) |
77%
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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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"The pyramid of energy is always upright" states that
1. The energy conversion efficiency of carnivores is better than herbivores
2. The energy conversion efficiency is same in all trophic levels
3. The energy conversion efficiency of herbivores is better than carbivores
4. Producers have the lowest energy conversion efficiency
1. The energy conversion efficiency of carnivores is better than herbivores
2. The energy conversion efficiency is same in all trophic levels
3. The energy conversion efficiency of herbivores is better than carbivores
4. Producers have the lowest energy conversion efficiency
Subtopic: Ecological Pyramids |
63%
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Arrange the following stages of ecological succession in the correct sequence
A. Invasion
B. Competition
C. Stabilization
D. Reaction
E. Nudation
Choose the correct answer from the options given below
1. E, A, C, B, D
2. A, E, B, D, C
3. E, A, B, D, C
4. A, E, D, B, C
A. Invasion
B. Competition
C. Stabilization
D. Reaction
E. Nudation
Choose the correct answer from the options given below
1. E, A, C, B, D
2. A, E, B, D, C
3. E, A, B, D, C
4. A, E, D, B, C
Subtopic: Ecological Succession (OLD NCERT) |
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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
Subtopic: Ecological Succession (OLD NCERT) |
79%
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Subtopic: Introduction |
76%
From NCERT
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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%
From NCERT
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Terrestrial life evolved from aquatic life due to
1. Development of extra-embryonic membranes
2. Development of glandular skin
3. Modification of appendages into limbs
4. High body temperature
1. Development of extra-embryonic membranes
2. Development of glandular skin
3. Modification of appendages into limbs
4. High body temperature
Subtopic: Ecological Succession (OLD NCERT) |
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Hints
Given below are two statements
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
| 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 |
91%
From NCERT
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