What is required in reactants for light reactions?

The L-D reactions need CO2 and light energy, and the L-IND reactions needs water and O2. The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH and CO2. What is required for both the light dependent and light independent reactions? Energy is required in both light dependent and light independent reactions.

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"do a testcross with a homozygous recessive plant."