Read the following list of animals and their developmental stages: Adult Asterias, Larva of Asterias, Obelia, Pleurobrachia, Sycon, Taenia How many of the above exhibit radial symmetry?

Step-by-step solution

Based on NCERT, the symmetry of the given organisms is as follows: Adult Asterias (Echinodermata): Radial symmetry Larva of Asterias (Echinodermata): Bilateral symmetry Obelia (Coelenterata): Radial symmetry Pleurobrachia (Ctenophora): Radial symmetry Sycon (Porifera): Asymmetrical Taenia (Platyhelminthes): Bilateral symmetry Therefore, exactly three organisms/stages (Adult Asterias, Obelia, and Pleurobrachia) exhibit radial symmetry. Counting the larva of Asterias as radially symmetrical leads to the incorrect ans