The critical day length for cocklebur is which of the following?
Correct answer: A. 8.5 hours
- A. 8.5 hours
- B. 10 hours
- C. 14 hours
- D. 15.5 hours
Explanation
The cocklebur, Xanthium strumarium, is a short-day plant that begins to flower in the late summer and fall, when day length no longer exceeds 8.5 hours.
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