The critical day length of a short-day plant is:

Correct answer: D. 15 ½ hours

  • A. 11:00 hours
  • B. 15:00 hours
  • C. 11 ½ Hours
  • D. 15 ½ hours

Explanation

Critical day length is the length of the light period in a 24-hour cycle required to inhibit the flowering of short-day plants. For short-day plants, this is 15 and a half hours (FACT). Short-day plants initiate flowering when the day length becomes shorter than a certain critical period.

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