Oxygen is added to the atmosphere by which of the following processes 1 Formation and breakdown of O...........

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Oxygen is added to the atmosphere by which of the following processes ?

1. Formation and breakdown of Ozone

2. Photosynthesis by plants

3. Metabolism by legume bacteria

Select the correct answer using the codes below.

2 only

2 and 3 only

1 only

1 and 3 only

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Explanation:

Statement 1: Formation of ozone consumes oxygen.
Statement 2: If you notice, the only major process returning oxygen is photosynthesis. This is why afforestation can tackle climate change and pollution.
Statement 3: The process of nitrogen-fixing by bacteria does not take place in the presence of oxygen.