Photosynthetically Active Radiation

This graph shows the relative rate of photosynthesis that occurs at different wavelengths of PAR, which can be seen as different colors of light. The peaks indicate the wavelengths where light energy is more efficiently absorbed by chloroplasts: cellular structures that certain producers (plants and algae) use for photosynthesis.

A graph showing the relative rate of photosynthesis in a chloroplast at different wavelengths of energy which correspond to different colors along a spectrum.
For wavelengths between 400 to 500 nanometers corresponding to the color blue, photosynthesis rates vary between 80 to 100 percent. For wavelengths between 500 to 600 nanomaters corresponding to the color green, photosynthesis rates vary between 25 to 80 percent. For wavelengths between 600 to 700 nanomaters corresponding to the color orange, photosynthesis rates vary between 40 to 90 percent. For wavelengths above 700 nanomaters corresponding to the color red, photosynthesis rates fall below 20 percent.
The relative rate of photosynthesis in a chloroplast at different wavelengths of PAR. Different wavelengths appear as different colors: 450 nm appears blue, 550 nm appears green, and 700 nm appears red.

Question 4

Using this graph as evidence, explain why most land plants appear green. Your answer should include which wavelengths are absorbed most and least efficiently by chloroplasts.