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