In seed plants, sperm travel down through what to reach the egg?
Correct answer: C. Pollen tube
- A. Stigma tube
- B. Ovule tube
- C. Pollen tube
- D. Stamen tube
Explanation
In seed plants, sperm travel down through a structure called the pollen tube to reach the egg. The pollen tube is a slender structure that develops from a pollen grain after it lands on the stigma of a flower. The tube grows down through the style of the pistil and delivers the sperm cells to the ovule where the egg is located. This process is part of the fertilization process in flowering plants, also known as angiosperms.
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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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