Which example shows zygomorphic symmetry?

Which example shows zygomorphic symmetry?

• A. Mustard and Chilli
• B. Canna
• C. Banana and Plantain
• D. Pea and Bean

Answer: (D)

Zygomorphic symmetry means the flower can be divided into two mirror-image halves by only one plane. This bilateral form is typical in many legumes, whose papilionaceous flowers are arranged with a distinct upper banner, two lateral wings, and a bottom keel. When you imagine a vertical plane through the flower, it lines up to create two equal halves, which is why peas and beans are classic examples of zygomorphic flowers. The other options generally show radial symmetry, where multiple planes can divide the flower into mirror images, so they don’t exhibit this single-plane bilateral form.

Zygomorphic symmetry means the flower can be divided into two mirror-image halves by only one plane. This bilateral form is typical in many legumes, whose papilionaceous flowers are arranged with a distinct upper banner, two lateral wings, and a bottom keel. When you imagine a vertical plane through the flower, it lines up to create two equal halves, which is why peas and beans are classic examples of zygomorphic flowers. The other options generally show radial symmetry, where multiple planes can divide the flower into mirror images, so they don’t exhibit this single-plane bilateral form.