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Q. No.
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) |
68%
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) |
75%
From NCERT
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Subtopic: Components & Types of Ecosystems |
87%
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 |
88%
From NCERT
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Primary productivity of a terrestrial ecosystem depends on all, except
1. A variety of environmental factors
2. Availability of nutrients
3. Photosynthetic capacity of plants
4. Types of heterotrophs at second and third trophic level
1. A variety of environmental factors
2. Availability of nutrients
3. Photosynthetic capacity of plants
4. Types of heterotrophs at second and third trophic level
Subtopic: Ecosystem Productivity |
82%
From NCERT
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Primary production is expressed in terms of weight as
1. Gram/m2
2. K cal/m2
3. Gram/m2 /year
4. Kcal/m2 /year
1. Gram/m2
2. K cal/m2
3. Gram/m2 /year
4. Kcal/m2 /year
Subtopic: Ecosystem Productivity |
65%
From NCERT
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Select the incorrect statement
| 1. | All the steps in decomposition operate simultaneously on the humus. |
| 2. | Humus is dark colored amorphous substance |
| 3. | Humus undergoes decomposition at very slow rate |
| 4. | Humus serves as reservoir of nutrients. |
Subtopic: Decomposition |
82%
From NCERT
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Mineralisation differs from leaching as in former
| 1. | Humus is degraded by microbes to release inorganic nutrients whereas in later water soluble inorganic nutrients go down into the soil horizon. |
| 2. | Detritus is broken down whereas in later humus is degraded |
| 3. | Water soluble inorganic nutrients go down in soil and in later detritus is degraded by detrivores |
| 4. | Humus becomes colloidal and in later humus becomes detritus. |
Subtopic: Decomposition |
76%
From NCERT
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Which one is incorrectly matched?
| 1. | Carnivores | - | Secondary or tertiary consumer |
| 2. | Herbivores | - | Primary consumer |
| 3. | Decomposers | - | Microbial heterotrophs |
| 4. | Detrivores | - | Secondary consumers |
Subtopic: Energy Flow |
88%
From NCERT
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