Final answer:
Sponges exhibit no symmetry, referred to as asymmetry, with no planes of symmetry, unlike radially or bilaterally symmetrical organisms which have multiple or single planes, respectively.
Step-by-step explanation:
When discussing types of symmetry in biological organisms, sponges exhibit a specific kind known as asymmetry. Unlike radial or bilateral symmetry, where you can find multiple or single planes of symmetry, respectively, asymmetrical organisms like the sponge have no planes of symmetry. The concept of radial symmetry is characterized by multiple planes that can divide the organism into identical sections through a central axis. In contrast, bilateral symmetry involves a single plane dividing the organism into two mirror-image halves.