Biradial symmetry and lack of cnidoblasts are the characteristics of-

Asterias and Adamsia

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Ctenoplana and Beroe

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Aurelia and Paramecium

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Hydra and Asterias

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Solution

The correct option is B Ctenoplana and Beroe
Ctenoplana and Beroe lack cnidoblasts and have biradial symmetry.
These belong to phylum Ctenophora.
Hydra, Adamsia, and Aurelia are coelenterates that have cnidoblasts.
Paramecium is a unicellular eukaryotic organism.
Asterias (starfish) is bilaterally symmetrical in the larval stage, but it transforms into a pentaradially symmetrical adult after metamorphosis.

So, the correct answer is 'Ctenoplana and Beroe'.

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