Question

why should the light department reaction occur before the light independent reaction?​

Answer 1

Answer:

Light-Independent Reactions

The light-independent molecules depend on the energy carrier molecules, ATP and NADPH, to drive the construction of new carbohydrate molecules. After the energy is transferred, the energy carrier molecules return to the light-dependent reactions to obtain more energized electrons.

Answer 2

Because the raw material ATP and NDPH that is needed for dark reaction to fix CO2 for the formation of sugar.