Classification of Animals
Question
Which of the following has a central gastro-vascular cavity with a single opening, mouth on hypostome?
Easy
Solution
Hydra (a cnidarian) has a central gastro-vascular cavity with a single opening, mouth on hypostome. Scypha has a spongocoel which opens out by an osculum. Taenia lacks a body cavity and a mouth. Locusta is an insect. Its body cavity is haemocoel. Its alimentary canal has two openings – mouth and anus.
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