The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why? Plants usually open their stomata at night. O Carbon dioxide concentrations decrease at night. It is often too cold at night for these reactions to take place. At night, plants cannot produce the water needed for the Calvin cycle. The Calvin cycle depends on products of the light reactions.

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Photosynthesis

Plants have a capacity that we humans can only imagine— the ability to produce food from sunlight. Sure, we can prepare some dishes that we can savor on, but it become possible because of the plants (as they serve as a producers of all the raw materials required). Photosynthesis is the method of assembling carbohydrates with the aid of sunlight.