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Q: Identify the animal that does not have bilateral symmetry.
  • A. Cnidaria
  • B. Arthropoda
  • C. Annelida
  • D. Mollusca
Correct Answer: Option A - Animals in the phylum Cnidaria, which includes jellyfish, corals and sea anemones, exhibit radial symmetry rather than bilateral symmetry. Bilateral symmetry is characterized by having a single plane that divides the body into two mirror-image halves, which is not the case for cnidarians. They have a body plan that is symmetrical around a central axis.
A. Animals in the phylum Cnidaria, which includes jellyfish, corals and sea anemones, exhibit radial symmetry rather than bilateral symmetry. Bilateral symmetry is characterized by having a single plane that divides the body into two mirror-image halves, which is not the case for cnidarians. They have a body plan that is symmetrical around a central axis.

Explanations:

Animals in the phylum Cnidaria, which includes jellyfish, corals and sea anemones, exhibit radial symmetry rather than bilateral symmetry. Bilateral symmetry is characterized by having a single plane that divides the body into two mirror-image halves, which is not the case for cnidarians. They have a body plan that is symmetrical around a central axis.