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.
19. In Figure 2, at which of the following wavelengths does the rate of photosynthesis exceed the rate of photosynthesis at 670 nm ?
Your Answer is
Correct Answer is B
Explanation
Look at figure 2, when the abscissa is 670, the ordinate is about 100. It can be seen that when the abscissa is in the range of 420-460, the ordinate is greater than 100, and option B 430 meets