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(B) At a light intensity of $0$ units,photosynthesis cannot occur because light is an essential requirement for the light-dependent reactions of photo

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Only respiration is taking place at this intensity of light.

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(B) At a light intensity of $0$ units,photosynthesis cannot occur because light is an essential requirement for the light-dependent reactions of photosynthesis.However,plant cells continue to perform cellular respiration $24$ hours a day to generate energy $(ATP)$ for survival.During respiration,plants consume oxygen and release carbon dioxide as a byproduct.Since there is no photosynthesis to consume the carbon dioxide produced by respiration,the net result is the release of carbon dioxide into the environment.

The graph shows the relationship between light intensity and the exchange of carbon dioxide by plant leaves. Why is the maximum amount of carbon dioxide released when the light intensity is $0$ units?

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