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Question

Bi-radial symmetry and lack of cnidoblasts are the characteristics of
  1. Ctenoplana and comb jelly

  2. starfish and sea anemone
  3. Aurelia and Paramecium
  4. Hydra and starfish


Solution

The correct option is A

Ctenoplana and comb jelly


Cnidoblasts are stinging cells containing one giant secretory organelle (cnida) that defines the phylum cnidaria. Sea anemones, Aurelia and Hydra belong to the phylum cnidaria.

Ctenoplana and  comb jellies (Beroe) are comb jellies belonging to the phylum ctenophora. 

Starfishes belong to the phylum echinodermata.
 
Paramecium belong to the phylum c
iliophora.
 

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