Question

In which of the following phyla the adult shows radial symmetry, while the larva shows bilateral symmetry?

• A. Annelids
• B. Arthropods
• C. Molluscs
• D. Echinodermata

Answer 1

The correct option is D Echinodermata

• Radial symmetry is the arrangement of parts of an organism around a central axis so that the organism can be divided into similar halves by any plane.
• Animals with bilateral symmetry can be divided only into mirror halves through a single plane.
• The larvae of echinoderms have bilateral symmetry, but during metamorphosis, this is replaced with radial symmetry i.e pentameric.

So, the correct answer is 'Echinodermata'.