Of the following, which one causes higher production of food in green plants?

Correct answer: C. Red

  • A. Blue
  • B. Orange
  • C. Red
  • D. Violet

Explanation

Red light is absorbed efficiently by chlorophyll and drives photosynthesis at a high rate, especially near the red absorption peak of chlorophyll a. Blue light is also highly effective, so students may choose blue if they remember the two major absorption regions but overlook that red is the expected single choice here.

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