Cnidaria Quiz

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Questions and Answers

What are the two basic body forms of cnidarians?

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.

What distinguishes Cnidarians from other animals?

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.

How do cnidarians coordinate their activities?

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

What are some examples of cnidarians?

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

Do all cnidarians reproduce sexually?

<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

Flashcards

Cnidarian Body Forms

Cnidarians have two main body types: swimming medusae and stationary polyps. Both have radial symmetry and tentacles with cnidocytes around their mouths.

Unique Cnidarian Features

Cnidarians have a nerve net instead of a brain and cnidocytes (or cnidoblasts), which are specialized cells used for injecting venom and capturing prey with ejectable flagella.