NEET Biology Animal Kingdom Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Animal Kingdom Topic Based

Question & Answer Discuss:

Biradial symmetry and lack of cnidoblasts are the characteristics of

(a) Ctenoplana and Beroe

(b) Hydra and starfish

(c) Starfish and sea anemone

(d) Aurelia and Paramecium.

Answer: (a)

Ctenophora is a small phylum of exclusively marine, invertebrate animals. Ctenoplana and Beroe are examples of ctenophora. They have biradial symmetry (a combination of radial and bilateral symmetries). They lack the specialized stinging cells (nematocysts) found in coelenterates, but one species (Haeckelia rubra) incorporates those of its jellyfish prey for its defense.

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