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Exam 17: Chordata: Urochordata and Cephalochordata

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Question 1

Multiple Choice

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Which of the following animals is not in the phylum Chordata?

A) sea squirts
B) salps
C) acorn worms
D) hagfish
E) lampreys

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Question 2

Multiple Choice

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Which of the following is not one of the five characteristics seen in all chordates at some time in their life history?

A) tubular nerve cord
B) mouth developed from blastopore
C) notochord
D) pharyngeal slits
E) postanal tail

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Question 3

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Members of the subphylum Cephalochordata are called

Increased larval motility is often adaptive for species with sedentary adults because it promotes

The gill slits perforating the pharynx of a tunicate are called

In the vertebrates,the notochord

Fish,reptiles,birds,and mammals are all members of the subphylum

These animals are commonly used in introductory zoology courses because they possess all five chordate characteristics throughout their life.

Terrestrial vertebrates made their appearance approximately 400 million years ago,near the end of this period:

Root-like extensions of the tunic called __________ are used to anchor a tunicate to the substrate.

Development in the tunicates involves a __________ larval stage.

Unlike the classic ascidian sea squirts,some urochordates,such as the salps,may be

There is little question that Chordata is a monophyletic group.There are some unresolved questions regarding whether the Craniata is more closely related to the Cephalochordata or to the Urochordata.Assume that the following new discoveries were made.Which might sway expert opinion in the direction of a sister relationship between Craniata and Cephalochordata? Check all that apply.

In chordates,the __________ is a dorsal rod,with a sheath of connective tissue,functioning in support.

The tunic of tunicates is composed of proteins,various salts,and

In the tunicates,__________ on the outside of the intestine may function in excretion.

__________ cells in the circulatory system of tunicates accumulate nitrogenous wastes.

Tentacles,known as __________ surround the oral hood of the cephalochordate.

The unattached end of adult urochordates contains two openings on projecting stalks that permit seawater to circulate through the body.They are called

The cavity surrounding the pharynx of a tunicate is called the