Which of the following statements best represents the relationships between the light reactions and the calvin cycle?

a. The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
b. The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions.
c. The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies thelightreactions with sugars to produce ATP.
d. The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle providesthelight reactions with water to split.



Answer :

c. The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.

Light reaction and Calvin cycle is light dependent reaction in photosynthesis. Light reaction in photosynthesis is light-dependent whereas the Calvin cycle or dark reaction in photosynthesis is light-independent.

The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP. light reactions gives ATP and NADPH to the carbon fixation process in the Calvin cycle, They provide water and electrons to the light reactions.

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