Question

Aurelia has

• A. Two smooth oral arms
• B. Two nematoblast rich oral arms
• C. Four tentacles
• D. Four cnidoblast rich oral arms

Answer 1

The correct option is D Four cnidoblast rich oral arms

Aurelia has an umbrella or inverted structure. The concave or Sub-umbrellar structure of Aurelia has a mouth like structure (manubrium) bearing four lobes called oral arms. The oral arms are abundantly provided with stinging capsules or nematocysts that are present in cnidoblasts/cnidocytes cells.

So, the correct answer is 'Four cnidoblast rich oral arms'.