Biradial symmetry and lack of cnidoblasts are the characteristics of:

Starfish and sea anemone

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Ctenoplana and Beroe

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Aurelia and Paramecium

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Hydra and starfish

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Solution

The correct option is B
Ctenoplana and Beroe

Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe which belong to the phylum Ctenophora.
A cnidoblast is a stinging cell which shoots out a nematocyst or stinging organ when stimulated. Cnidoblasts define the phylum Cnidaria. Aurelia (jellyfish), sea anemone and Hydra belong to this phylum.
Starfish belongs to a much more advanced phylum, Echinodermata, and Paramecium belongs to a different kingdom altogether, i.e. Protista.

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