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Q. No.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
Irrigation without proper drainage of water has a very detrimental effect on crops.
Reason (R):
It draws salt to the surface of the soil which is inimical to the growth of crops.
In the light of the above statements, choose the most appropriate answer from the options given below :
1.
Both (A) and (R) are true but (R) does not explain (A).
2.
(A) is true but (R) is false.
3.
(A) is false but (R) is true.
4.
Both (A) and (R) are true and (R) explains (A).
Subtopic: Resource Utilisation & Maintenance |
75%
From NCERT
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Study the given diagram regarding accelerated or cultural eutrophication of a water body:
The correctly matched pairs include:
| 1. | Normally the cause if an excess of nutrients applied to the soil. |
| 2. | Some nutrients leach into the soil and get drained into the water body. |
| 3. | Some nutrients run off over the ground into the body of water. |
| 4. | The excess nutrients cause an algal bloom. |
| 7. | Eventually, the algal bloom dies, sinks to the bottom of the lake, gets decomposed by bacteria which increases the dissolved oxygen in the water body. |
| 8. | Increased dissolved oxygen content is dangerous to larger life forms. |
The correctly matched pairs include:
| 1. | All | 2. | All except 7 and 8 |
| 3. | All except 1, 3, and 4 | 4. | Only 1 and 2 |
Subtopic: Water Pollution |
73%
From NCERT
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The figure shows biomagnifications of DDT in an aquatic food chain. At which stage is the biomagnification largest in magnitude?
| 1. | A to B |  |
| 2. | B to C | |
| 3. | C to D | |
| 4. | D to E |
Subtopic: Water Pollution |
From NCERT
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Consider the two statements:
1. Both Statement I and Statement II are incorrect
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
| I: | At least 1.0% impurities must be present in a sample of domestic sewage to make it unfit for human use. |
| II: | Waste water from industries often contains toxic heavy metals like mercury, cadmium, copper and lead that have a density greater than 5 gm/cm3. |
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
Subtopic: Water Pollution |
61%
From NCERT
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The Environment [protection] Act to protect and improve the quality of our environment [Air, Water and Soil] was passed by the Government of India in:
| 1. | 1974 | 2. | 1981 |
| 3. | 1986 | 4. | 1988 |
Subtopic: Introduction to Pollution & Types |
68%
From NCERT
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Identify the correct statements regarding noise pollution:
|
I:
|
Even a brief exposure to an extremely high sound level of 150 dB may damage ear drums and permanently impair hearing ability.
|
|
II:
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Noise also causes sleeplessness, increased heart beat, altered breathing pattern, thus leading to considerable stress in humans.
|
1. Both Statement I and Statement II are incorrect
2. Both Statement I and Statement II are correct
3. Only Statement II is correct
4. Only Statement I is correct
3. Only Statement II is correct
4. Only Statement I is correct
Subtopic: Air Pollution |
92%
From NCERT
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Subtopic: Resource Utilisation & Maintenance |
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The second commitment period for Kyoto Protocol was decided at:
1. Durban
2. Bali
3. Doha
4. Cancun
1. Durban
2. Bali
3. Doha
4. Cancun
Subtopic: Green House Effect & Global Warming |
62%
NEET - 2013
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Climate of the world is threatened by:
1. Decreasing amount of atmospheric oxygen
2. Increasing amount of atmospheric carbon dioxide
3. Decreasing amount of atmospheric carbon dioxide
4. Increasing concentration of atmospheric oxygen
1. Decreasing amount of atmospheric oxygen
2. Increasing amount of atmospheric carbon dioxide
3. Decreasing amount of atmospheric carbon dioxide
4. Increasing concentration of atmospheric oxygen
Subtopic: Green House Effect & Global Warming |
78%
From NCERT
NEET - 2013
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Assertion(A): Landfills are not much useful.
Reason(R): The amount of garbage generation especially in rural areas has increased.
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.
Reason(R): The amount of garbage generation especially in rural areas has increased.
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: Solid Waste Pollution |
53%
From NCERT
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