UGC NET Questions (Paper – 1)

Global warming is driven largely by enhanced greenhouse gas concentrations that trap heat, altering climate patterns. Ozone depletion, on the other hand, involves breakdown of ozone molecules in the stratosphere by chlorine and bromine released from substances such as CFCs and halons. While the two issues interact in complex ways, they are scientifically distinct problems with different primary causes, effects and treaties.

Option A:
Option A is incorrect because global warming and ozone depletion are not identical; conflating them leads to conceptual confusion and wrong policy responses.

Option B:
Option B is correct as it clearly separates the temperature-related phenomenon linked to greenhouse gases from the UV-shielding issue linked to ozone chemistry and CFCs.

Option C:
Option C is incorrect; volcanic eruptions and earthquakes are not the sole or main causes of these global environmental changes.

Option D:
Option D is incorrect because ozone depletion actually increases, not reduces, UV-B reaching the surface.