Question

what is your prediction for this experiment?

a. the rate of photosynthesis is greater for blue light than for green light.
b. the rate of photosynthesis is greater for green light than for blue light.
c. the rate of photosynthesis is independent of color as long as light intensity is the same.

how will you determine the dependence of rate of photosynthesis on color?

a. i will compare the rate of photosynthesis with different amounts of elodea.
b. i will compare the rate of photosynthesis of green light and white light.
c. i will compare the rate of photosynthesis of green light and blue light.
d. i will compare the rate of photosynthesis with and without aluminum foil.

Explanation:

Analyze light absorption in photosynthesis

Using the Light Absorption and Reflection and Photosynthetic Pigments knowledge points

• Chlorophylls \(a\) and \(b\) are the primary pigments driving photosynthesis.
• These pigments absorb light strongly in the blue (\(\sim 430\text{–}450\text{ nm}\)) and red (\(\sim 640\text{–}660\text{ nm}\)) regions of the visible spectrum.
• Green light (\(\sim 500\text{–}550\text{ nm}\)) is mostly reflected or transmitted rather than absorbed, making plants appear green.
• Consequently, the rate of photosynthesis is significantly higher under blue light than under green light.
• This makes option A the correct prediction: "The rate of photosynthesis is greater for blue light than for green light."

Determine experimental design for color dependence

• To test how the rate of photosynthesis depends on the color of light, we must vary the color of light while keeping other variables constant.
• Comparing the rate under green light versus blue light directly tests this color dependence.
• Therefore, the correct experimental approach is option C: "I will compare the rate of photosynthesis of green light and blue light."

Answer:

Question 1

• A. The rate of photosynthesis is greater for blue light than for green light. (Correct answer)
• B. The rate of photosynthesis is greater for green light than for blue light.
• C. The rate of photosynthesis is independent of color as long as light intensity is the same.

Question 2

• A. I will compare the rate of photosynthesis with different amounts of Elodea.
• B. I will compare the rate of photosynthesis of green light and white light.
• C. I will compare the rate of photosynthesis of green light and blue light. (Correct answer)
• D. I will compare the rate of photosynthesis with and without aluminum foil.