Which statement correctly compares radial symmetry with bilateral symmetry?

Which statement correctly compares radial symmetry with bilateral symmetry?

• A. Radial symmetry can be divided along any diameter; bilateral symmetry can be divided along a single plane
• B. Radial symmetry is always asymmetrical
• C. Bilateral symmetry can be divided along any diameter
• D. Both types have no planes of symmetry

Answer: (A)

Radial symmetry involves body parts arranged around a central axis, giving many possible planes of symmetry. You can cut through the center along different planes and still get similar halves. Bilateral symmetry, on the other hand, has a single plane that divides the body into left and right mirror-image sides, with a distinct front and back. So radial symmetry can be divided along any diameter that passes through the center, while bilateral symmetry is divided along one specific plane. This fits the idea that starfish or jellyfish can be cut along multiple planes, whereas humans or dogs are only cleanly split along one plane. The other statements aren’t correct: radial symmetry isn’t inherently asymmetrical; bilateral symmetry doesn’t have multiple valid cutting planes; and both forms do have planes of symmetry.

Radial symmetry involves body parts arranged around a central axis, giving many possible planes of symmetry. You can cut through the center along different planes and still get similar halves. Bilateral symmetry, on the other hand, has a single plane that divides the body into left and right mirror-image sides, with a distinct front and back.

So radial symmetry can be divided along any diameter that passes through the center, while bilateral symmetry is divided along one specific plane. This fits the idea that starfish or jellyfish can be cut along multiple planes, whereas humans or dogs are only cleanly split along one plane.

The other statements aren’t correct: radial symmetry isn’t inherently asymmetrical; bilateral symmetry doesn’t have multiple valid cutting planes; and both forms do have planes of symmetry.