Solution: A photon is adsorbed by Photosystem II in photosynthesis to break down water into oxygen and protons in solution. The photosystem must absorb yet another photon to fuel the Calvin cycle’s enzymatic machinery that produces NADPH and ATP.

But since the light energy coming from the moon is aided by the sun, the amount of light the moon gives is very less as compared to the sun. So, the number of photons is also less and that is unable to excite the chlorophyll molecules.

Since the moonlight’s light energy is insufficient to stimulate chlorophyll molecules. As a result, the photosynthetic process cannot take place in the presence of moonlight.