Under which color of light will plants be least likely to make food?

• A. red
• B. blue
• C. orange
• D. green

Answer: (D)

Plants primarily utilize light for photosynthesis, which is the process they use to make food. During photosynthesis, chlorophyll, the green pigment found in plants, absorbs light most effectively in the red and blue wavelengths of the spectrum. These colors are crucial because they provide the necessary energy for the plant's biochemical processes.

In contrast, green light is reflected rather than absorbed by chlorophyll, which is why plants appear green to our eyes. Since green light does not contribute significantly to the energy absorbed during photosynthesis, plants are least likely to make food under green light conditions. This inability to utilize green light effectively results in a reduced rate of photosynthesis, leading to less food production in plants exposed primarily to this wavelength.