Question

table 8 - 4 anatomy of aurelia
structure function
marginal tentacles provide sensory information and used in defense and locomotion
mouth ingestion of food and elimination of indigestible particles (egestion)
oral arms defense and prey capture
gonads (testes and ovaries) organs for sexual reproduction; gametes are released into the gastric pouches and exit the body through the mouth
gastric pouch one of four divisions of the gastrovascular cavity for digestion of food
radial canals extensions of the gastric pouches that radiate outward from the pouches and distribute nutrients throughout body
circular canal circular extension of the gastric pouches that distributes nutrients to outer rim of jellyfish
check your progress
3.1 sketch your specimen and label the following structures: oral arms, marginal tentacles, gonads.
3.2 compare and contrast the scyphozoan medusa with the medusa bud of obelia.
132 exploring zoology: a laboratory guide

Explanation:

3.1: To answer this, one would need to have a specimen of Aurelia (jelly - fish) and draw it, then label the oral arms (used for defense and prey capture), marginal tentacles (for sensory info, defense and locomotion) and gonads (sexual reproduction organs).
3.2: Scyphozoan medusae are large, free - living jellyfish. Obelia medusa buds are part of the life - cycle of Obelia, a hydrozoan. Scyphozoan medusae are usually larger, more complex in structure and are the dominant life stage. Obelia medusa buds are smaller, often part of a colonial life - cycle and are less complex in comparison.

Answer:

3.1: Draw a specimen of Aurelia and label oral arms, marginal tentacles, gonads.
3.2: Scyphozoan medusae are larger, more complex and dominant life stage; Obelia medusa buds are smaller, part of colonial life - cycle and less complex.