Practice question
Question
Which carotenoid is implicated in blue-light perception in guard cells?
Explanation
The right choice is C: Zeaxanthin. In PSS-Sec-E-Sensory biology, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) β-carotene; B) Lutein; D) Violaxanthin. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
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