Which is an important difference between light-dependent (l-d) and light-independent (l-ind) reactions in photosynthesis? a. the l-d reaction needs co2 and light energy and the l-ind reaction needs water and o2. b. the l-d reaction requires light energy and water and the l-ind reaction requires atp, nadph and co2. c. the l-d reaction can only occur during daylight and the l-ind reaction can only occur during the night. d. the l-d reaction needs water and co2 and the l-ind reaction needs co2 and light.