MDCAT Biology MCQ #367

Based on the PTB action spectrum graph, which two wavelength regions of the visible spectrum show the highest rates of photosynthesis?

MDCAT Biology MCQ #367

  1. Question 1

    Q1. Based on the PTB action spectrum graph, which two wavelength regions of the visible spectrum show the highest rates of photosynthesis?

    • A) Yellow and Green
    • B) Green and Orange
    • C) Blue and Red
    • D) Violet and Indigo

    Answer: Blue and Red

    Explanation: The PTB action spectrum shows major peaks at violet-blue and red regions. Green light (Option B) is mostly reflected.