Which term describes a flower that has only one sex, either androecium or gynoecium?

Which term describes a flower that has only one sex, either androecium or gynoecium?

• A. Actinomorphic
• B. Zygomorphic
• C. Unisexual
• D. Trimerous

Answer: (C)

The concept being tested is the sexual composition of a flower. A flower with only one sex is unisexual, meaning it has either stamens (androecium) or pistils (gynoecium) but not both. This distinguishes it from perfect or bisexual flowers that carry both male and female reproductive organs. Unisexual flowers can occur on the same plant (monoecious) or on separate plants (dioecious), which is a broader plant-level pattern but not about a single flower’s anatomy. The other terms describe different features: actinomorphic means radial symmetry, zygomorphic means bilateral symmetry, and trimerous refers to floral parts in multiples of three.

The concept being tested is the sexual composition of a flower. A flower with only one sex is unisexual, meaning it has either stamens (androecium) or pistils (gynoecium) but not both. This distinguishes it from perfect or bisexual flowers that carry both male and female reproductive organs. Unisexual flowers can occur on the same plant (monoecious) or on separate plants (dioecious), which is a broader plant-level pattern but not about a single flower’s anatomy. The other terms describe different features: actinomorphic means radial symmetry, zygomorphic means bilateral symmetry, and trimerous refers to floral parts in multiples of three.