A researcher exposes a suspension of green algae to different light sources with different combinations of wavelengths.Compared with a suspension of algae that is receiving white light (source C), the algae suspension exposed to artificial light from source A remains healthy but produces less oxygen and has a slower growth rate.The algae suspension exposed to artificial light from source B ceases to produce oxygen, and its growth is halted.Which of the following statements about light sources is correct?
A) Light source A provides only infrared light.
B) Light source B provides only red light.
C) Light source A provides either blue or red light but not both.
D) Light source B provides only blue light.
E) Light source A provides only green light.

Question

Quizplus · Accepted Answer

Light source A likely provides either blue or red light but not both, which are essential for photosynthesis but in a limited capacity compared to full-spectrum white light, hence the reduced oxygen production and slower growth. Light source B's effect suggests it lacks the necessary wavelengths for photosynthesis, but none of the options indicate a light source that would completely halt photosynthesis by providing only a single color that algae can't use at all, making the best available choice that A provides a limited but essential spectrum.

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