Chordate Hallmarks Quiz

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Questions and Answers

What is the function of the incurrent siphon in adult sea squirts?

The incurrent siphon, or oral siphon, is used to draw water into the body of the adult sea squirt.

How do adult ascidians differ from typical chordates?

Adult ascidians lack a notochord and have only a single ganglion instead of a dorsal nerve cord.

What is the role of the endostyle in sea squirt feeding?

The endostyle, a glandular groove along the midventral side of the pharynx, secretes mucus to form a net for filter feeding.

Describe the process of food capture and ingestion in sea squirts.

Cilia on the gill bars pull the mucus net across the pharynx, trapping food particles. The net is then worked into a rope and carried to the esophagus and stomach. Signup and view all the answers

Where does nutrient absorption occur in sea squirts?

Nutrients are absorbed in the midgut of sea squirts. Signup and view all the answers

How are indigestible wastes expelled from the sea squirt body?

Indigestible wastes are discharged from the anus, located near the excurrent siphon. Signup and view all the answers

What components make up the circulatory system in sea squirts?

The circulatory system consists of a ventral heart and two large vessels, one on either side of the heart, connected to a diffuse system of smaller vessels and spaces. Signup and view all the answers