Q. No.The nutrients in an ecosystem are:
| 1. | continuously lost from an ecosystem |
| 2. | needed as a continuous supply from the outside |
| 3. | recycled time and again indefinitely |
| 4. | continuously synthesized by physical forces |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
80%
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Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:
| 1. | nitrogen fixation | 2. | ammonification |
| 3. | denitrification | 4. | eutrophication |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
71%
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A chemical that enters living organisms primarily from the atmosphere is:
| 1. | phosphorus | 2. | sulfur |
| 3. | sodium | 4. | carbon |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
81%
From NCERT
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Of all the required nutrients other than nitrogen, phosphorus is the most likely to be scarce enough to limit plant growth. |
| Reason (R): | The reservoir of phosphorus is in the mineral form rather than in the atmosphere. |
| 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
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
51%
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The amount of carbon dioxide in the atmosphere is:
1. increasing
2. decreasing
3. holding steady
4. fluctuating wildly
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
82%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | We generally undervalue the magnitude of ecosystem services that benefits us. |
| Reason (R): | We do not attach a monetary value to the services of natural ecosystems. |
| 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
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
66%
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The prime driving force for the water cycle is:
| 1. | evapotranspiration from plants |
| 2. | rainfall |
| 3. | snowmelt |
| 4. | percolation of water through the soil |
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
54%
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Among the following bio-geo-chemical cycles, which one does not have losses due to respiration?
1. Phosphorus
2. Nitrogen
3. Sulphur
4. All of the above
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
69%
From NCERT
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Consider the following statements:
| I: | The atmosphere only contains about 1% of total global carbon. |
| II: | Unlike the carbon cycle, there is no respiratory release of phosphorus into the atmosphere. |
| III: | Sulphur and phosphorus cycles are sedimentary cycles. |
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
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
69%
From NCERT
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Consider the two statements:
| I: | Phosphorus is much more important as a limiting nutrient in aquatic systems. |
| II: | Phosphorus is generally much less soluble than nitrogen, it is leached from the soil at a much slower rate than nitrogen. |
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 and II is incorrect.
4. Both I and II are correct.
Subtopic: Mineral Cycling & Ecosystem Services (OLD NCERT) |
51%
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