Question

Which of the following plays a major role in replacing oxygen in the atmosphere?

• A. Green plants
• B. The weathering of rocks
• C. Fossil-fuel combustion
• D. All of the above

Answer 1

The correct option is A Green plants

Photosynthesis provides most of the oxygen found in the earth's atmosphere. During the light reaction of the photosynthesis, water molecules split in the presence of light and releases protons, electrons and oxygen molecules. This process of splitting of water molecules is known as photolysis.

So, the correct answer is option A.