Which example illustrates actinomorphic symmetry?

Which example illustrates actinomorphic symmetry?

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

Answer: (A)

Actinomorphic symmetry means the flower has radial symmetry: it can be divided into two identical halves by multiple planes that pass through the center. Flowers with this symmetry have parts arranged evenly around the central axis, like spokes on a wheel. Mustard flowers show this clearly. Their four petals are arranged in a cross shape around the center, so you can imagine slicing the flower along several vertical planes and getting mirror-image halves. This even, circular arrangement around the center is the hallmark of actinomorphy. Chilli flowers also fit this pattern. They have petals arranged around the center in a uniform, circular way, so multiple planes through the center can produce identical halves. That radial layout is what characterizes actinomorphic flowers. The other options don’t display that same radial arrangement. Pea and bean flowers are known for bilateral symmetry along one plane, with a specialized petal arrangement that creates a distinct front and back. Canna flowers and banana/plantain inflorescences tend to lack the multiple, evenly spaced planes of symmetry seen in actinomorphic flowers, so they don’t illustrate radial symmetry in the same way.

Actinomorphic symmetry means the flower has radial symmetry: it can be divided into two identical halves by multiple planes that pass through the center. Flowers with this symmetry have parts arranged evenly around the central axis, like spokes on a wheel.

Mustard flowers show this clearly. Their four petals are arranged in a cross shape around the center, so you can imagine slicing the flower along several vertical planes and getting mirror-image halves. This even, circular arrangement around the center is the hallmark of actinomorphy.

Chilli flowers also fit this pattern. They have petals arranged around the center in a uniform, circular way, so multiple planes through the center can produce identical halves. That radial layout is what characterizes actinomorphic flowers.

The other options don’t display that same radial arrangement. Pea and bean flowers are known for bilateral symmetry along one plane, with a specialized petal arrangement that creates a distinct front and back. Canna flowers and banana/plantain inflorescences tend to lack the multiple, evenly spaced planes of symmetry seen in actinomorphic flowers, so they don’t illustrate radial symmetry in the same way.