A) Aurelia
B) Physalia
C) Halistema
D) Obelia
Correct Answer: B
Solution :
Phylum-Coelentrata includes hydroids. Jellyfish and corals. This phylum is also known as cnidaria and can be categorised into 3 classes : Hydrozoa, Scyphozoa and Anthoroa. Class-Hydrozoa includes hydroids, which is characterised by both polyp and medusa forms and show polymorphism, e.g., Hydra, Obelia and Physalia. The later is a nuisance for bather as it possess a neurotoxic poison. It is also known as Portuguese man of war.
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