Question

Which of the following statements best represents the relationships between the light reactions and 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 1

The correct option is A

The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.

The conversion of solar energy into chemical energy and its utilisation to convert CO2 to a carbohydrate is what links both these reactions.