What type of symmetry do adult echinoderms exhibit?

• A. Radial symmetry
• B. Bilateral symmetry
• C. Asymmetrical symmetry
• D. Spherical symmetry

Answer: (A)

Verified step by step guidance

1. Understand the concept of symmetry in biology: Symmetry refers to the balanced distribution of duplicate body parts or shapes. In biology, it is used to describe the body plan of organisms.
2. Identify the types of symmetry: The main types of symmetry in biology are radial symmetry, bilateral symmetry, asymmetrical symmetry, and spherical symmetry.
3. Define radial symmetry: Radial symmetry is a type of symmetry where body parts are arranged around a central axis, like spokes on a wheel. Organisms with radial symmetry can be divided into similar halves by multiple planes passing through the central axis.
4. Consider the characteristics of adult echinoderms: Echinoderms, such as starfish and sea urchins, exhibit radial symmetry as adults. Their body parts are arranged around a central point, allowing them to interact with their environment from all sides.
5. Conclude that adult echinoderms exhibit radial symmetry, as their body structure is organized around a central axis, which is a defining feature of this type of symmetry.