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.
17. Based on Table 1 and Figure 1, which color of light is associated with the wavelength of light that results in the greatest absorption by chlorophyll b ?
Your Answer is
Correct Answer is A
Explanation
Look at figure 1 first, and look at the solid line representing chlorophyll b. When its ordinate absorption is the largest, the corresponding abscissa wavelength should be between 475-500;
Look at table 1 again, This wavelength corresponds to blue light