TOPIC 6: Chordates

Question 1

chordates are bilaterian animals, true or false

Answer 1

true

Question 2

how would you describe a chordate

Answer 2

a bilaterally symmetic coelomates with segmented bodies

Question 3

shared derived traits of chordates

Answer 3

1. notochord
2. dorsal hollow nerve chord
3. pharangyl slits
4. muscular post-anal tail

Question 4

what is the purpose of the notochord

Answer 4

• structural support

Question 5

where is the notochord derived from

Answer 5

derived from the dorsal mesoderm and is formed bu embryogenesis

Question 6

embryogeneiss

Answer 6

embryotic development stage where organ systems begin to develop from embryotic layers
(only in dueterostomes)

Question 7

where does the dorsal hollow nerve chord form from

Answer 7

ectoderm

Question 8

what is the function of pharangyl slits

Answer 8

• filter feeding (in invertebrates)
• gas exchagne for the aquatic ones

Question 9

what is contained in a post anal tail

Answer 9

muscles and skeleton

Question 10

_____ have segmentation and the segments are specialized throughout the body

Answer 10

chordates

Question 11

basal group in chordates

Answer 11

lancelets

Question 12

marine feeders that retain characteristics of the chordate body plan as adults

Answer 12

lancelets

Question 13

characteristics of tunicates

Answer 13

• invertebrate chordates
• metamorphs into an adult
• mostly sessile
• does not resemble chordate body plan

Question 14

group that draws in water with an incurrent siphon and filters water with a pharyngyl basket that collects food particles

Answer 14

tunicates