Question 1

The name Urochordata means literally

Accepted Answer

A) "tail chordates." 
B) "head chordates." 
C) "kidney chordates." 
D) "tunic chordates." 
A) "tail chordates." 
B) "head chordates." 
C) "kidney chordates." 
D) "tunic chordates." A

Question 2

Our knowledge of the fossil invertebrate chordates is quite limited because

Accepted Answer

A) they were very rare. 
B) they were soft-bodied. 
C) fossils from that period were obliterated by volcanism. 
D) they were only freshwater.
Fill in the Blank Questions 
A) they were very rare. 
B) they were soft-bodied. 
C) fossils from that period were obliterated by volcanism. 
D) they were only freshwater.
Fill in the Blank Questions B

Question 3

The urochordates are

Accepted Answer

A) called tunicates. 
B) marine animals. 
C) sessile as adults,but tadpole-like as larvae. 
D) all of these 
A) called tunicates. 
B) marine animals. 
C) sessile as adults,but tadpole-like as larvae. 
D) all of these D

Question 4

In primitive vertebrates,the notochord functions in

Accepted Answer

A) sensory reception. 
B) coelom formation. 
C) muscle attachment. 
D) respiration. 
A) sensory reception. 
B) coelom formation. 
C) muscle attachment. 
D) respiration.

Question 5

The perforated pharynx of chordates had an ancestral function for

Accepted Answer

A) support. 
B) respiration. 
C) filter-feeding. 
D) all of the above 
A) support. 
B) respiration. 
C) filter-feeding. 
D) all of the above

Question 6

Tunicates are sessile organisms with no larval stages in their life cycle.

Accepted Answer

A) True 
 B)False

Question 7

The skeletal rod found in all chordates is called a ___________.

Accepted Answer

The answer of The skeletal rod found in all chordates...

Question 8

The ostracoderms are found only in freshwater lakes in the tropics.

Accepted Answer

A) True 
 B)False

Question 9

The bony fishes currently are divided into two groups: the _______________ and the ____________________.

Accepted Answer

Actinopter

Question 10

Urochordates have an unusual feature of their circulatory system: their heart pumps blood in both directions.

Accepted Answer

A) True 
 B)False

Question 11

Fossils known as ____________ are very useful in dating Paleozoic sediments,and are now known to be from small marine vertebrates.

Accepted Answer

The answer of Fossils known as ____________ are very useful...

Question 12

The jawless vertebrates are called Agnatha,and the jawed vertebrates are called ____________.

Accepted Answer

The answer of The jawless vertebrates are called Agnatha,and the...

Question 13

Amphioxus is certainly not the ancestor of modern vertebrates,but researchers believe it more closely resembles the earliest prevertebrate than any other living animal.

Accepted Answer

A) True 
 B)False

Question 14

In both tunicates and cephalochordates,the ventral side of the pharynx contains a ciliated,mucus-secreting groove,the ____________.

Accepted Answer

The answer of In both tunicates and cephalochordates,the ventral side...

Question 15

The reptiles,as well as the agnathans,are considered to be ____________ taxa because these groups do not contain all the descendents of the most recent common ancestor.

Accepted Answer

The answer of The reptiles,as well as the agnathans,are considered...

Question 16

Garstang's hypothesis of vertebrate evolution is the

Accepted Answer

A) annelid-vertebrate hypothesis. 
B) echinoderm-vertebrate hypothesis. 
C) amphioxus-vertebrate hypothesis. 
D) tunicate larva-vertebrate hypothesis. 
A) annelid-vertebrate hypothesis. 
B) echinoderm-vertebrate hypothesis. 
C) amphioxus-vertebrate hypothesis. 
D) tunicate larva-vertebrate hypothesis.

Question 17

Vertebrates differ from other chordates because they have a brain case.

Accepted Answer

A) True 
 B)False

Question 18

Pikia,the earliest known chordate collected from the Burgess Shale of British Columbia,closely resembles

Accepted Answer

A) amphioxus. 
B) living sessile tunicates. 
C) the ammocoete larva. 
D) an adult larvacean. 
A) amphioxus. 
B) living sessile tunicates. 
C) the ammocoete larva. 
D) an adult larvacean.

Question 19

The phylum Urochordata includes the

Accepted Answer

A) Ascidiacea and Cephalaspidomorphi. 
B) Larvacea and Cephalochordata. 
C) Ascidiacea and Thaliacea. 
D) Thaliacea and Calcichordata. 
A) Ascidiacea and Cephalaspidomorphi. 
B) Larvacea and Cephalochordata. 
C) Ascidiacea and Thaliacea. 
D) Thaliacea and Calcichordata.

Question 20

Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ______ to the alimentary canal.

Accepted Answer

The answer of Unlike most invertebrate phyla,the nerve cord of...

The name Urochordata means literally

Our knowledge of the fossil invertebrate chordates is quite limited because

The urochordates are

In primitive vertebrates,the notochord functions in

The perforated pharynx of chordates had an ancestral function for

Tunicates are sessile organisms with no larval stages in their life cycle.

The skeletal rod found in all chordates is called a ___________.

The ostracoderms are found only in freshwater lakes in the tropics.

The bony fishes currently are divided into two groups: the _ and the ______.

Urochordates have an unusual feature of their circulatory system: their heart pumps blood in both directions.

Fossils known as ____________ are very useful in dating Paleozoic sediments,and are now known to be from small marine vertebrates.

The jawless vertebrates are called Agnatha,and the jawed vertebrates are called ____________.

Amphioxus is certainly not the ancestor of modern vertebrates,but researchers believe it more closely resembles the earliest prevertebrate than any other living animal.

In both tunicates and cephalochordates,the ventral side of the pharynx contains a ciliated,mucus-secreting groove,the ____________.

The reptiles,as well as the agnathans,are considered to be ____________ taxa because these groups do not contain all the descendents of the most recent common ancestor.

Garstang's hypothesis of vertebrate evolution is the

Vertebrates differ from other chordates because they have a brain case.

Pikia,the earliest known chordate collected from the Burgess Shale of British Columbia,closely resembles

The phylum Urochordata includes the

Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ______ to the alimentary canal.

Science of Zoology and Evolution of Animal Diversity

Animal Ecology

Animal Architecture

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges: Phylum Porifera

Cnidarians and Ctenophores

Acoelomorpha, Platyzoa, and Mesozoa: Flatworms, Gastrotrichs, Gnathiferans, and Mesozoans

Polyzoa and Kryptrochozoa: Cycliophora, Entoprocta, Ectoprocta, Brachiopoda, Phoronida, and Nemertea

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Arthropods

Chaetognaths, Echinoderms, and Hemichordates

Fishes

The Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Filters

Exam 15: Vertebrate Beginnings: the Chordates

The name Urochordata means literally

Our knowledge of the fossil invertebrate chordates is quite limited because

The urochordates are

In primitive vertebrates,the notochord functions in

The perforated pharynx of chordates had an ancestral function for

Tunicates are sessile organisms with no larval stages in their life cycle.

The skeletal rod found in all chordates is called a ___________.

The ostracoderms are found only in freshwater lakes in the tropics.

The bony fishes currently are divided into two groups: the _______________ and the ____________________.

Urochordates have an unusual feature of their circulatory system: their heart pumps blood in both directions.

Fossils known as ____________ are very useful in dating Paleozoic sediments,and are now known to be from small marine vertebrates.

The jawless vertebrates are called Agnatha,and the jawed vertebrates are called ____________.

Amphioxus is certainly not the ancestor of modern vertebrates,but researchers believe it more closely resembles the earliest prevertebrate than any other living animal.

In both tunicates and cephalochordates,the ventral side of the pharynx contains a ciliated,mucus-secreting groove,the ____________.

The reptiles,as well as the agnathans,are considered to be ____________ taxa because these groups do not contain all the descendents of the most recent common ancestor.

Garstang's hypothesis of vertebrate evolution is the

Vertebrates differ from other chordates because they have a brain case.

Pikia,the earliest known chordate collected from the Burgess Shale of British Columbia,closely resembles

The phylum Urochordata includes the

Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ______ to the alimentary canal.

Science of Zoology and Evolution of Animal Diversity

Animal Ecology

Animal Architecture

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges: Phylum Porifera

Cnidarians and Ctenophores

Acoelomorpha, Platyzoa, and Mesozoa: Flatworms, Gastrotrichs, Gnathiferans, and Mesozoans

Polyzoa and Kryptrochozoa: Cycliophora, Entoprocta, Ectoprocta, Brachiopoda, Phoronida, and Nemertea

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Arthropods

Chaetognaths, Echinoderms, and Hemichordates

Fishes

The Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Filters

The bony fishes currently are divided into two groups: the _ and the ______.