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Q. No. Assertion(A): Decomposition process is slower if detritus is rich in lignin and chitin
Reason(R): Decomposition is largely an oxygen requiring process
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.
(A) is false, but (R) is true
Subtopic: Decomposition |
70%
Level 2: 60%+
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The primary productivity in an ecosystem is expressed as:
1. \(\text {gm}^{-2}~ \text { yr}^{-1}\)
2. \(\text {gm}^{-2}~ \text { yr}\)
3. \(\text {kcal m}^{-2}~ \text { yr}^{-1}\)
4. \(\text {kcal}{}~ \text { m}^{-2}\)
1. \(\text {gm}^{-2}~ \text { yr}^{-1}\)
2. \(\text {gm}^{-2}~ \text { yr}\)
3. \(\text {kcal m}^{-2}~ \text { yr}^{-1}\)
4. \(\text {kcal}{}~ \text { m}^{-2}\)
Subtopic: Ecosystem Productivity |
Level 3: 35%-60%
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Select true(T) or false(F) for the given statements and choose the correct option.
| A: | Any calculations of energy content, biomass or numbers has to include all organisms at the trophic level |
| B: | A given species occupies only one trophic level in the same ecosystem at the same time. |
| A | B | |
| 1. | T | T |
| 2. | T | F |
| 3. | F | T |
| 4. | F | F |
Subtopic: Ecological Pyramids |
70%
Level 2: 60%+
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Read the following statements and select the correct option:
| A: | It is said that Detritus food chain may be connected to grazing food chain at some levels. |
| B: | Some of the organisms of DFC are prey to the GFC animals. |
| 1. | Both A and B are correct and B is correct explanation of A |
| 2. | Both A and B are correct but B is not correct explanation of A |
| 3. | Only B is correct, A is incorrect |
| 4. | Only A is correct, B is incorrect |
Subtopic: Energy Flow |
82%
Level 1: 80%+
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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 |
89%
Level 1: 80%+
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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 |
83%
Level 1: 80%+
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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%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | No energy that is trapped into an organism remains in it for ever. |
| Reason (R): | The energy trapped by producers is either passed on to a consumer or the organism dies. |
| 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: Energy Flow |
83%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Lichens are the first organisms to colonise bare rocks hence are ecologically important |
| Reason (R): | Lichens are symbiotic association between two heterotrophs |
| 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. |
65%
Level 2: 60%+
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The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as:
| 1. | Standing state | 2. | Standing crop |
| 3. | Humus | 4. | Detritus |
64%
Level 2: 60%+
NEET - 2023
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