Adult birds normally possess only one functional____________?
Correct answer: B. Ovary
- A. Ureter
- B. Ovary
- C. Lung
- D. Testis
Explanation
Female birds normally retain only the left ovary and left oviduct as functional, while the right side is greatly reduced, an adaptation that reduces body mass for flight. Students may choose one functional testis because some birds have asymmetry in reproductive organs, but the standard general statement concerns the ovary.
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About Human Reproductive System
The human reproductive system includes the male and female organs that produce gametes, secrete sex hormones and support fertilization and development. Questions cover the testes, ovaries, reproductive ducts, menstrual and ovarian cycles, ovulation, fertilization, implantation, placenta formation and the roles of FSH, LH, oestrogen, progesterone and testosterone.
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