Question

Assertion (A): UV radiation causes photo-dissociation of ozone into O₂ and O, thus causing damage to the stratospheric ozone layer.

Reason (R): Ozone hole is resulting in global warming and climate change.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Assertion (A) is true but reason (R) is false.

Explanation:

UV radiation can split ozone into oxygen and an oxygen atom as part of the ozone formation–destruction cycle. The ozone hole increases UV radiation at Earth’s surface; it is not the stated cause of global warming and climate change.