Respuesta :

Answer:

Because photosystems need light to operate (photo=light).

Photosystems use energy from sunlight, Calvin systems use energy stored in the plant.

Explanation:

The Calvin cycle is a dark reaction because it does not need sunlight. Although it can happen during the day, this process does not require energy from the sun to work. Other names for the Calvin cycle include the Calvin-Benson cycle, light-independent reaction, carbon fixation and C3 pathway.

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The Calvin cycle work at night, but the photosystems cannot because the photosystem needs direct energy from sunlight to be operated functionally.

What are Photosystems?

Photosystems may be defined as functional and structural units of protein complexes involved in photosynthesis that contains chlorophyll pigments that absorb light energy for photosynthesis.

The Calvin cycle is a light-independent reaction that occurs during the night as well as daytime. But it utilizes the stored energy to make its final products with the help of several enzymes.

Therefore, it is well described above.

To learn more about the Calvin cycle, refer to the link:

https://brainly.com/question/2473924

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