Why are plants green? To reduce the noise in photosynthesis
I think the necessary background fact here is that chlorophyll is a miracle chemical because it's safe. Not 'cause it's efficient. It's not efficient at splitting water, about 1%, but unlike so many other chemicals that can split water when hit with photons, it can perform the job while producing very few harmful free radicals. That's chlorophyll's secret sauce. Since green is a relatively high frequency that's intense in sunlight, it's safer to filter that color out. "Noise" here means a less smooth chemical process will produce more free radicals.