Which of the following enhances the exchange of gases and supports higher levels of activity than diffusion alone?
gills
jaws
kidneys
6. Multiple Choice
30 seconds
1 pt
Which of the following is not a defining trait of chordates?
a notochord
gill slits open across the wall of the pharynx
muscular tail that extends beyond the anus
a closed circulatory system
7. Multiple Choice
30 seconds
1 pt
All chordates are vertebrates.
True
False
8. Multiple Choice
20 seconds
1 pt
Fish-like marine animals usually found half buried in sand
Respiration
Lancelets
Excretion
Tunicates
9. Multiple Choice
20 seconds
1 pt
How do lancelets reproduce?
Sexually only
Both
Neither
Asexually only
10. Multiple Choice
30 seconds
1 pt
Members of this phylum includes acorn worms and pterobranchs.
Hemichordata
Echinodermata
Urochordata
Cephlachordata
11. Multiple Choice
30 seconds
1 pt
The ciliated larva of an acorn worm is called the
brachiolaria
tornaria
bipinnaria
trochophore
12. Multiple Choice
30 seconds
1 pt
Which support structure shared by both invertebrate and vertebrate chordates is depicted by “B” in this image of lancelet anatomy shown in figure 1 ?
Gonad
Nerve cord
Notochord
Vertebrate
13. Multiple Choice
30 seconds
1 pt
In chordates, the __________ is a dorsal rod, with a sheath of connective tissue, functioning in support. spinal column endostyle hemichord backbone notochord
Nerve cord
Notacord
vertebrate
backbone
14. Multiple Choice
30 seconds
1 pt
In chordates, the __________ are a series of openings in the pharyngeal region, between the digestive tract and the outside of the body.
gill slits
atriopores
siphons
book gills
15. Multiple Choice
30 seconds
1 pt
The cavity surrounding the pharynx of a tunicate is called the
nephrocoel.
coelom.
atrium.
hemocoel.
16. Multiple Choice
30 seconds
1 pt
Members of the subphylum Cephalochordata are called
lancelets
tunicates
salps
acorn worms
17. Multiple Choice
30 seconds
1 pt
A dorsal tubular nerve cord and pharyngeal gill slits are considered to be evidence of evolutionary ties between hemichordates and
echinoderms
chordates
vertebrates
arthropods
18. Multiple Choice
30 seconds
1 pt
An organism that has a dorsal, hollow nerve chord during some stage of its life is in the
Phylum Chordata
Kingdom Mammalia
Phylum Porifera
Domain Archae
19. Multiple Choice
30 seconds
1 pt
Which of the following is NOT a characteristic of all members of Phylum Chordata?
dorsal hollow nerve cord
vertebrae made of cartilage or bone
pharyngeal pouches/slits
post-anal tail
20. Multiple Choice
30 seconds
1 pt
What does the term echinoderm mean?
tube feet
star shaped
spiny skin
stomach foot
21. Multiple Choice
30 seconds
1 pt
Echinoderms have an internal skeleton and a system of fluid-filled tubes called a(n)...
water vascular system
nervous system
notochord
ampulla
22. Multiple Choice
30 seconds
1 pt
Tunicates or sea squirts are members of the chordate subphylum
Pterobranchia
Urochordata
Cephalochordata
Hemichordata
23. Multiple Choice
30 seconds
1 pt
The oral siphon of a tunicate carries water, undigested food wastes, and gametes out of the tunicate's body.
True
False
24. Multiple Choice
30 seconds
1 pt
Larval tunicates are planktonic and tadpole-like. Even though the adult tunicates are initially difficult to recognize as members of the phylum Chordata, the larvae possess all four unique chordate characteristics.
True
False
25. Multiple Choice
30 seconds
1 pt
All of the following are true of lancelets except one. Select the exception.
)They are dioecious, and external fertilization results in free-swimming larvae.
The body wall forms a large atrium around the pharynx.
Their notochord is restricted to the tail region.
They are relatively weak swimmers and spend most of their time partly buried in a filter-feeding