If there was no green house effect:

1.  Earth would have been too cold for many organisms to survive
2.  The diversity on Earth would have been much higher
3.  The primary productivity would have been much higher
4.  Earth would not have any atmosphere

Subtopic:  Green House Effect & Global Warming |
 86%
From NCERT
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In India, the name Ramesh Chandra Dagar, is associated with:
1. Organic farming
2. Conservation of forests
3. Recycling of plastic wastes
4. Preservation of water lands

Subtopic:  Agrochemical & Radioactive Waste |
 89%
From NCERT
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Consider the following statements:

I:  Freshwater algal blooms, the result of an excess of nutrients [particularly phosphates] cause large scale fish mortality.
II:  Algae grow very quickly under high nutrient availability, but each alga is short-lived, and the result is a high concentration of dead organic matter, the decay of which consumes dissolved oxygen in the water, resulting in hypoxic conditions.


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:  Water Pollution |
 77%
From NCERT
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Burying radioactive wastes is not acceptable to many people as:
1. there is a risk of groundwater contamination
2. it may explode
3. it will harm the buried dead bodies
4. it may get accumulated in vegetations

Subtopic:  Agrochemical & Radioactive Waste |
 75%
From NCERT
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Ozone hole develops over Antarctica each year between:

1. Early January and late April

2. Early March and late July

3. Late August and early October

4. Late September and early December

Subtopic:  Ozone Layer Depletion |
 78%
From NCERT
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Sherwood Rowland and Mario Molina were awarded Nobel Prize in Chemistry in 1995 for their contribution to the study of:
1. Impact of air pollution on human health
2. Ozone depletion
3. Global warming
4. Deforestation and its global impact

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):  Soil erosion rate increases due to deforestation.
Reason (R):  Deforestation decreases the amount of litter cover, which provides protection from surface runoff.
 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.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Agrochemical & Radioactive Waste |
 68%
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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):  Ozone hole over Antarctica develops each year between late August and early October.
Reason (R):  Ozone depletion occurs within the polar vortex.
 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.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Ozone Layer Depletion |
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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):  Most of the longer-wavelength UV-C radiation reaches the surface of the earth.
Reason (R):  Ozone is transparent to most UV-C.
 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.
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Ozone Layer Depletion |
 54%
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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):  Greenhouse effect is harmful to life on earth.
Reason (R):  It leads to increased risk in human beings for the development of certain cancers.
 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.

Subtopic:  Green House Effect & Global Warming |
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