- 1(current)
Q. No.The minimum requirement for an ecosystem to recycle nutrients present in it would be:
| 1. | producers |
| 2. | producers and decomposers |
| 3. | producers, primary consumers, and decomposers |
| 4. | producers, primary consumers, secondary consumers, and decomposers |
Consider the following statements:
The rate of decomposition is high if:
| I: | The detritus is rich in lignin and chitin. |
| II: | The detritus is rich in nitrogen and sugars. |
| III: | The environmental conditions are warm and moist. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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| Assertion (A): | Low temperature and anaerobiosis inhibit decomposition resulting in build-up of organic chemicals. |
| Reason (R): | Most decomposers are anaerobic psychrophiles. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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During the decomposition of complex organic matter:
| I: | Fragmentation of detritus creates smaller particles. |
| II: | Due to leaching water-soluble inorganic nutrients get precipitated. |
| III: | Catabolism by fungal and bacterial enzymes degrades detritus to simple organic monomers. |
| IV: | Humus is highly resistant to microbial action |
| V: | Mineralization is a rapid process of release of inorganic nutrients from the humus |
1. All except III are correct
2. All except III and IV are correct
3. All except III and V are correct
4. Only III is correct
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Decomposers like fungi and bacteria are :
| i. | Autotrophs |
| ii. | Heterotrophs |
| iii. | Saptrotrophs |
| iv. | Chemo-autotrophs |
Choose the correct answer :
| 1. | i and ii | 2. | i and iv |
| 3. | ii and iii | 4. | i and iii |
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If decomposers go extinct on Earth:
| 1. | Detritivores will replace them |
| 2. | Primary production will increase |
| 3. | Nutrients will accumulate in dead plants and animals |
| 4. | There will be no effect on carnivores |
Sometimes the term "detritivore" is used interchangeably with:
| 1. | decomposers | 2. | primary consumers |
| 3. | secondary consumers | 4. | autotrophs |
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Consider the given two statements:
| I: | Humus has the ability to store nutrients. |
| II: | Humus is a colloidal substance and increases the cation-exchange capacity of the soil. |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct but II is incorrect.
4. I is incorrect but II is correct.
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- 1(current)
Q. No.
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