Cnidaria Quiz

Cnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes.

Their distinguishing features are a decentralized nervous system distributed throughout a gelatinous body and the presence of cnidocytes or cnidoblasts, specialized cells with ejectable flagella used mainly for envenomation and capturing prey.

Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors.

<p>Examples of cnidarians include jellyfish, hydroids, sea anemone, corals, and some of the smallest marine parasites.</p> Signup and view all the answers

<p>Not all cnidarians reproduce sexually, but many species have complex life cycles of asexual polyp stages and sexual medusae stages.</p> Signup and view all the answers