0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

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.


  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If the assertion is true but the reason is false
  3. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  4. If both the assertion and reason are false
  5. If the assertion is false but reason is true

A
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
B
If the assertion is true but the reason is false
C
If the assertion is false but reason is true
D
If both the assertion and the reason are true and the reason is a correct explanation of the assertion
E
If both the assertion and reason are false
Solution
Verified by Toppr

The warming up of global atmosphere present day is due to the increase in green house effect. Green house effect (GHE) describe the roles of water vapour, CO2 and other trace gases in keeping the Earth's surface warmer than it would be otherwise.These radiatively active gases are relatively transparent to incoming shortwave radiation (visible spectrum), but are relatively opaque to outgoing reradiating (infrared rays) longwave radiation. The latter radiation, which would otherwise escape to space, is trapped by these gases within the lower levels of the atmosphere. The subsequent reradiation of some of the energy back to the surface maintains surface temperature higher than they would be if the gases were absent (without the green house effect the Earth's average global temperature would be 18 degree celsius rather than the present 15 degree celsius). There is concern that increasing concentration of the green house gases including CO2, CH4, and man made chlorofluorocarbons (CFCS), may enhance the green house effect and cause global warming. Ozone layer present in the stratosphere is depleted by the aerosols and chloroflurocarbons. Ozone protects the earth from high energy ultra violet radiation. So, the correct answer is 'If both the assertion and reason are true but the reason is not a correct explanation of the assertion'

Was this answer helpful?
0
Similar Questions
Q1
Assertion : UV radiation causes photodissociation of ozone into O2 and O. Thus causing damage to the stratospheric ozone layer.

Reason : Ozone hole is resulting in global warming and climate change.
View Solution
Q2

Regarding the assertion and reason, choose the correct option.
Assertion [A]: UV radiation causes photo-dissociation of ozone into O2 and O causing damage to the ozone layer.
Reason [R]: The ozone hole has been the major cause of global warming and climate change.


View Solution
Q3

Read the given assertion and reason and choose the correct option.
Assertion [A]: UV radiation causes the photo-dissociation of ozone into O2 and O, thus causing damage to the ozone layer.
Reason [R]: The ozone hole has been the major cause of global warming and climate change.


View Solution
Q4
Assertion [A]: Deforestation is one of the main factors contributing to global warming.
Reason [R]: Besides CO2, methane and CFCs are also greenhouse gases.
View Solution
Q5
Regarding the assertion and reason, choose the correct option.
Assertion [A]: Deforestation is one main factor contributing to global warming.
Reason [R]: Besides, CO2, methane and CFCs are also greenhouse gases.
View Solution