The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?
A) Green and yellow wavelengths inhibit the absorption of red and blue wavelengths.
B) Oxygen given off during photosynthesis interferes with the absorption of light.
C) Other pigments absorb light in addition to chlorophyll a.
D) Aerobic bacteria take up oxygen, which changes the measurement of the rate of photosynthesis.

Question

The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?
A) Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. 
B) Oxygen given off during photosynthesis interferes with the absorption of light. 
C) Other pigments absorb light in addition to chlorophyll a. 
D) Aerobic bacteria take up oxygen, which changes the measurement of the rate of photosynthesis.

Quizplus · Accepted Answer

Other pigments such as chlorophyll b, carotenoids, and phycobilins also absorb light in addition to chlorophyll a, leading to a broader action spectrum for photosynthesis compared to the absorption spectrum of chlorophyll a alone.

The Figure Shows the Absorption Spectrum for Chlorophyll a and the Action