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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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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