| Choose the correct statement (s). |
| I. Cnidarians exhibit polymorphism. |
| II. Hydrozoa is distinguished from other coelenterates by interstitial cells. |
| III. Coelenterates differ from other animals in having nematocysts. |
| IV. Polyphase is absent in Hydra. |
A) I and IV
B) II and III
C) I and III
D) IV and II
Correct Answer: C
Solution :
Hydra distinguishes from other coelenterates by non-cellular mesoglea. It belongs to class-Hydrozoa, where either polyps are found or polyps and medusae are present.
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