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Q. No.Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of:
1.
Carbon
2.
Sulphur
3.
Calcium
4.
Phosphorus
Subtopic: Water Pollution |
77%
From NCERT
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Match the items in column I and column II and choose the correct option:
| Column I | Column II | ||
| A. | UV | i. | Biomagnifications |
| B. | Biodegradable organic matter | ii. | Eutrophication |
| C. | DDT | iii. | Snow blindness |
| D. | Phosphates | iv. | BOD |
| Options: | A | B | C | D |
| 1. | ii | i | iv | iii |
| 2. | iii | ii | iv | i |
| 3. | iii | iv | i | ii |
| 4. | iii | i | iv | ii |
Subtopic: Ozone Layer Depletion | Water Pollution |
91%
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).
| Assertion (A): | Photochemical smog is a primary air pollutant. |
| Reason (R): | It is formed in traffic-congested cities where the conditions are cold and the intensity of solar radiation is less. |
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
Subtopic: Air Pollution |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Motor vehicles equipped with catalytic converters should use unleaded petrol. |
| Reason (R): | Lead poisoning affects brain and is responsible for many cases of intellectual disabilities. |
| 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: Air Pollution |
57%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | The presence of Tubifex in a water sample is a good indicator of high quality [non-polluted] of the water sample. |
| Reason (R): | Tubifex is a nematode that cannot survive in water with low dissolved oxygen content. |
| 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: Water Pollution |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Ecological sanitation is a practical, hygienic, efficient, and cost-effective solution to human waste disposal. |
| Reason (R): | Ecological sanitation systems are systems that allow for the safe recycling of nutrients to crop production in such a way that the use of non-renewable resources is minimized. |
| 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: Resource Utilisation & Maintenance |
64%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Recycling is the best solution for the treatment of electronic waste, provided it is carried out in an environment-friendly manner. |
| Reason (R): | It can be easily done with manual participation without exposure to toxins. |
| 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: Resource Utilisation & Maintenance |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Burying radioactive waste in a suitably shielded container deep in the rocks is a method not agreeable to many people. |
| Reason (R): | According to them, the best solution will be disposal of nuclear waste in space. |
| 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: Agrochemical & Radioactive Waste |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Wetlands are the largest natural source of atmospheric methane in the world, and therefore remain a major area of concern with respect to climate change. |
| Reason (R): | Wetlands are characterized by water-logged soils and distinctive communities of organisms that have evolved and adapted to the constant presence of water. |
| 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: Water Pollution |
57%
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Episodic shifts in winds and water currents across the equatorial Pacific can cause floods in the South American desert while stalling and drying up the monsoon in Indonesia and India. |
| Reason (R): | During an El Niño event, the surface waters in the central and eastern Pacific Ocean become significantly colder than usual. |
| 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: Green House Effect & Global Warming |
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