Question

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.

• A. Both assertion and reason are true and the reason is the correct explanation for assertion
• B. Both assertion and reason are true but the reason is not the correct explanation for the assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is D Both assertion and reason are false

UV radiation does not cause photodissociation of ozone into O₂ and O. Instead, it takes part in the formation of ozone in two steps.

O₂ ---> O + O
O₂ + O ---> O₃

Due to certain careless human activities, the ozone layer in the stratosphere has been thinning down in certain areas, which are being known as "ozone hole". The ozone hole has been resulting in rain failure, increased incoming radiation, cancers and a reduction in crop production. Global warming and climate changes are mainly caused due to an increase in the amounts of greenhouse gases in the atmosphere.