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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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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