Which type of symmetry is described as being divisible into similar parts by multiple planes through the center?

• A. Radial symmetry
• B. Bilateral symmetry
• C. Asymmetry
• D. Spiral symmetry

Answer: (A)

Radial symmetry is the arrangement where an organism can be divided into similar parts by multiple planes that pass through the center. This means you can slice through the center along many different directions and each slice would yield comparable, mirror-like sections. That fits the description of being divisible into similar parts by multiple planes through the center, as seen in starfish or sea anemones.

In contrast, bilateral symmetry relies on a single plane to create two equal, mirror-image halves; asymmetry has no symmetry plane at all; and spiral symmetry involves parts arranged in a spiral around the center rather than along multiple central planes.