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Q. No.
Given below are two statements:
Assertion (A):
The base of a pyramid is broad and it narrows down at the apex
Reason (R):
Shape of pyramid may vary with the food or energy relationship between organisms at different trophic level.
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.
Both (A) and (R) are false.
Subtopic: Ecological Pyramids |
From NCERT
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Given below are two statements:
| Assertion (A): | The pyramid of biomass in sea is generally inverted. |
| Reason (R): | The biomass of fishes far exceeds than that of phytoplankton |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Pyramids |
81%
From NCERT
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Given below are two statements:
| Assertion (A): | Pyramid of energy is always upright, can never be inverted. |
| 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. |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Pyramids |
91%
From NCERT
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Given below are two statements:
| Assertion (A): | Succession and evolution would have been parallel process. |
| Reason (R): | The present day communities in the world have come to be because of succession that has occurred over millions of years since life started on the earth. |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Succession (OLD NCERT) |
73%
From NCERT
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Given below are two statements:
| Assertion (A): | The vegetational changes during succession affect food and shelter for various types of animals. |
| Reason (R): | As succession proceeds, the number and types of animals and decomposers also change |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Succession (OLD NCERT) |
73%
From NCERT
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Given below are two statements:
| Assertion (A): | Hydrarch and xerarch successions take place in wetter areas and dry areas respectively. |
| Reason (R): | Both hydrach and xerarch succession lead to mesic condition |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Succession (OLD NCERT) |
67%
From NCERT
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Given below are two statements:
| Assertion (A): | In secondary succession, climax is reached more quickly |
| Reason (R): | The rate of succession is much faster than primary succession. |
| 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. | Both (A) and (R) are false. |
Subtopic: Ecological Succession (OLD NCERT) |
74%
From NCERT
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Subtopic: Components & Types of Ecosystems |
86%
From NCERT
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The biomass of an ecosystem is generally upright. It means the biomass will be greatest at the bottom. Exception to this is
1. Tree ecosystem
2. Grassland ecosystem
3. Pond ecosystem
4. Forest ecosystem
1. Tree ecosystem
2. Grassland ecosystem
3. Pond ecosystem
4. Forest ecosystem
Subtopic: Ecological Pyramids |
77%
From NCERT
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Match the following columns and select the correct option.
| A | Primary productivity | (i) | Mass of living matter at a particular time |
| B | Standing crop | (ii) | Organic matter formed by consumers |
| C | Secondary productivity | (iii) | Is occupied by trees |
| D | Top level in stratification | (iv) | Due to producers |
| A | B | C | D | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (iv) | (i) | (ii) | (iii) |
| 3. | (iv) | (i) | (iii) | (i) |
| 4. | (i) | (ii) | (iii) | (iv) |
Subtopic: Ecosystem Productivity |
89%
From NCERT
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