Of the visible light spectrum, the rate of photosynthesis is lowest under which color of light?

• A. Red light
• B. Green light
• C. Violet light
• D. Blue light

Answer: (B)

Verified step by step guidance

1. Understand the relationship between light absorption and photosynthesis: Photosynthesis relies on pigments like chlorophyll to absorb light energy. Chlorophyll absorbs light most effectively in the red and blue regions of the spectrum, while it reflects green light.
2. Analyze the visible light spectrum: The visible light spectrum includes colors such as violet, blue, green, yellow, orange, and red. Each color corresponds to a specific wavelength range.
3. Consider the role of chlorophyll: Chlorophyll a and chlorophyll b are the primary pigments involved in photosynthesis. They absorb light in the red and blue wavelengths but reflect green light, making plants appear green.
4. Evaluate the rate of photosynthesis under different colors: Since green light is reflected rather than absorbed, the rate of photosynthesis is lowest under green light compared to other colors like red, blue, or violet.
5. Conclude based on the evidence: The rate of photosynthesis is lowest under green light because it is not effectively absorbed by chlorophyll pigments, which are essential for capturing light energy.