Environmental Issues

Biology
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Assertion

UV radiation causes photo-dissociation of ozone into and O, thus causing damage to the stratospheric ozone layer.

Reason

Ozone hole is resulting in global warming and climate change.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Both Assertion and Reason are incorrect.
Medium
AIIMS
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A lake with an inflow of domestic sewage rich in organic waste may result in:

A
Drying of the lake very soon due to algal bloom.
B
An increased production of fish due to lot of nutrients.
C
Death of fish due to lack of oxygen.
D
Increased population of aquatic food web organisms.
Medium
AIIMS
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Assertion

Deforestation is one main factor contributing to global warming.

Reason

Besides , two other gases methane and CFCs are also included under greenhouse gases.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Both Assertion and Reason are incorrect
Hard
AIIMS
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Biological Oxygen Demand (BOD) is a measure of 

A
Industrial wastes poured into water bodies
B
Extent to which water is polluted with organic compound
C
Amount of carbon monoxide inseparably combined with haemoglobin
D
Amount of oxygen needed by green plants during night
Hard
AIIMS
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Ozone in stratosphere extends

A
10-20km
B
20-25km
C
15-30km
D
25-40km
Medium
AIIMS
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The stratospheric ozone depletion leads to?

A
Global warming
B
Increase in the incidence of skin cancers
C
Forest fires
D
All of the above
Medium
AIIMS
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Assertion : Agricultural output increased several times after introduction of DDT.

Reason : DDT was the first insecticide used on a wide scale.

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C
If the assertion is true but the reason is false
D
If both the assertion and reason are false
E
If the assertion is false but reason is true
Medium
AIIMS
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Assertion :Presently, the global atmosphere is warming up.

Reason :The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth. 

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C
If the assertion is true but the reason is false
D
If both the assertion and reason are false
E
If the assertion is false but reason is true
Medium
AIIMS
View solution>
Assertion

Presently, the global atmosphere is warming up.

Reason

The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Both Assertion and Reason are incorrect.
Hard
AIIMS
View solution>

Biological Oxygen Demand (BOD) is a measure of

A
Industrial wastes poured into water bodies.
B
Extent to which water is polluted with organic compounds.
C
Amount of carbon monoxide inseparably combined with haemoglobin.
D
Amount of oxygen needed by green plants during night.
Medium
AIIMS
View solution>