2.40 Understand that respiration continues during the day and night, but that the net exchange of carbon dioxide and oxygen depends on the intensity of light

Figure 1: Plant during the day

Yes, plants photosynthesize, but they respire too. They respire throughout the day and the night, because, of course, it is a living organism. As you should know, glucose is used in respiration, which the plant produces through photosynthesis :)

During the night, a plant only respires, as there is no sunlight. This means that it gives off carbon dioxide and does not re-absorb it. Similarly, during the night, oxygen will not be given off, as the plant is not photosynthesizing.

Remember: photosynthesis depends on light, but respiration never stops ^_^

Figure 2: Plant at night