Final answer:
Blue and red lights are the most effective for photosynthesis in plants using chlorophyll a and b, while green light is the least effective. Thus, plants grown under blue light will show the most growth, followed by those under red light, and the least growth in those under green light.
Step-by-step explanation:
The question relates to the optimal light conditions for plant growth, specifically regarding the color of light that causes the most growth in plants that use chlorophyll a and b for photosynthesis. Blue light and red light are most effective for photosynthesis because these colors are best absorbed by chlorophyll. Greenlight is least absorbed, so it is not as effective. In an experiment with three plants grown under different colors of light, the plant is grown under blue light (Plant A) would likely show the most growth followed by the plant under orange light, which is closer to red (Plant C), and lastly, the plant under green light (Plant B) would show the least growth. Plants containing only chlorophyll b when exposed to different wavelengths will harness the most energy from blue light at 450nm and red light at 670nm since these are the wavelengths that chlorophyll b absorbs the most.