The given graph shows different levels of oxygen in the air at different times in a forest. Based on the given graph, select the correct option.

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Solution

During photosynthesis, plants take in carbon dioxide and give out oxygen. Therefore, the amount of oxygen will be high when photosynthesis is taking place. Photosynthesis takes place in the daytime, which means the oxygen level will be high in the daytime and low at night. In the given graph, point Y represents the least amount of oxygen while X and Z the highest amount of oxygen. Therefore, point X and Z shows the level of oxygen in the air in the presence of light, i.e., during the day.

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