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    Campbell Biology Concepts
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    Exam 39: Plant Responses to Internal and External Signals
  5. Question
    Most Plants Close Their Stomata at Night
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Most Plants Close Their Stomata at Night

Question 69

Question 69

Multiple Choice

Most plants close their stomata at night. What color of light would be most effective in promoting stomatal opening in the middle of the night?


A) red
B) far-red
C) blue
D) red followed by far-red
E) far-red followed by blue

Correct Answer:

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