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SQ's + answers-L10-Cnidaria

SQ's + answers-L10-Cnidaria - BIS 1B(Winter 2008 Study...

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BIS 1B (Winter 2008) Study questions: Cnidaria (lecture 10) 1. What is a cnida, and what is its function? This is the term for the intracellular stinging organelle of cnidarians. Cnidae are produced by specialized cells called cnidocytes, and consist of a capsule containing a long coiled thread-like tube. The thread frequently bears barbs or spines. After being triggered by a mechanoreceptor (usually a sensitive bristle-like or hair-like structure), the cnida discharges explosively, as a result of hydrostatic pressure. The cnida can entangle prey and/or inject them with toxins. There are many kinds of cnidae. Those with a double-walled capsule containing toxins are called “nematocysts”. 2. Distinguish between polyp and medusa forms of a cnidarian. A polyp is a tube-shaped and (usually) sessile form, anchored to a substrate, with the oral end away from the substrate. Polyps frequently occur in colonies. Examples include sea anemones (solitary) and corals (colonial). A medusa is a bell- or umbrella-shaped organism, usually free-
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