Multiple choice

A green leaf placed in a dark room is illuminated by red light. The leaf will appear

  1. green

  2. red

  3. yellow

  4. black
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A green leaf appears green because chlorophyll absorbs red and blue light while reflecting green. When illuminated with only red light, the leaf absorbs that red light (since chlorophyll absorbs red wavelengths) and reflects very little - making it appear black. The leaf cannot appear green (no green light present), red (absorbs red), or yellow (requires green+red reflection).

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