Which term refers to flowers that cannot be divided into two equal halves by any plane?

Which term refers to flowers that cannot be divided into two equal halves by any plane?

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

Answer: (D)

Symmetry in flowers is the idea being tested here. Actinomorphic flowers have radial symmetry, meaning you can cut them with multiple planes through the center and each half is a mirror of the other. Zygomorphic flowers have bilateral symmetry, so there’s exactly one plane that divides the flower into two mirror-image halves. Trimerous describes a pattern of floral parts in threes, which is about floral organization rather than symmetry itself. Asymmetric flowers lack any plane of symmetry, so no cut through the center yields two identical halves. That’s why the term that fits this description is asymmetric.

Symmetry in flowers is the idea being tested here. Actinomorphic flowers have radial symmetry, meaning you can cut them with multiple planes through the center and each half is a mirror of the other. Zygomorphic flowers have bilateral symmetry, so there’s exactly one plane that divides the flower into two mirror-image halves. Trimerous describes a pattern of floral parts in threes, which is about floral organization rather than symmetry itself. Asymmetric flowers lack any plane of symmetry, so no cut through the center yields two identical halves. That’s why the term that fits this description is asymmetric.