The correct statement regarding how the process of photosynthesis affects the atmosphere is:
Photosynthesis is the main source of oxygen in the atmosphere.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose. During this process, carbon dioxide (CO₂) is taken in from the atmosphere, and oxygen (O₂) is released as a byproduct. This process is crucial for maintaining atmospheric oxygen levels, which are vital for the survival of aerobic organisms, including humans.
The other statements are not accurate:
- Photosynthesis does not merely add small amounts of oxygen; it is the predominant source of atmospheric oxygen.
- Photosynthesis does not change water vapor and nitrous oxide into atmospheric oxygen; instead, it uses CO₂ and water to produce glucose and oxygen.
- Photosynthesis does not remove oxygen from the atmosphere; it is responsible for producing and releasing oxygen.