MDCAT Biology MCQ #203

A botanist compares two graphs: one showing light absorption and another showing the rate of photosynthesis. What does the action spectrum specifically represent?

MDCAT Biology MCQ #203

  1. Question 1

    Q1. A botanist compares two graphs: one showing light absorption and another showing the rate of photosynthesis. What does the action spectrum specifically represent?

    • A) Relative effectiveness of different wavelengths
    • B) Amount of light energy absorbed by chlorophyll
    • C) The percentage of green light reflected
    • D) The concentration of carotenoids in the leaf

    Answer: Relative effectiveness of different wavelengths

    Explanation: The absorption spectrum measures light uptake by pigments, whereas the action spectrum measures the actual rate of photosynthesis at different wavelengths.