[Campbell Biology P.243] Based on the action spectrum for photosynthesis Figure 10.9b and En... | Practice Question

Based on the action spectrum for photosynthesis Figure 10.9b and Engelmann's experiment Figure 10.9c , which wavelengths of light drive the highest rates of photosynthesis?

  • A: Green and yellow light
  • B: Violet-blue and red light
  • C: Orange and yellow light
  • D: Only red light

Explanation

Figure 10.9b shows two main peaks in the action spectrum: one in the violet-blue range around 430 nm and another in the red range around 660 nm . Figure 10.9c further confirms this, showing aerobic bacteria congregating most in violet-blue and red light, indicating high oxygen release and thus high photosynthesis rates in these regions.