Passage IV
The chemical reactions associated with photosynthesis can be summarized with the following chemical equation:
6CO2 + 12H2O + energy → C6H12O6 + 6O2 + 6H2O
Table 1 lists wavelength ranges for visible light and the color frequently associated with each range.
Figure 1 shows the relative absorption of light by chlorophyll a and chlorophyll b versus the wavelength of light from 400 nm to 750 nm.
Figure 2 shows the average rate of photosynthesis at various wavelengths as a percent of the average rate of photosynthesis at 670 nm.
21. Which of the following conclusions is best supported by Figures 1 and 2 ? The wavelength that results in the highest rate of photosynthesis also results in the:
Your Answer is
Correct Answer is C
Explanation
Look at figure 2 first, the abscissa wavelength corresponding to the highest rate of photosynthesis is about 440;
Back to figure 1, when the abscissa is 440, the ordinate absorption of the dotted line chlorophyll a is the largest