Hemichordates

Question 1

In hemichordates, of the 5 diagnostic chordate characteristics, which one is present?

Answer 1

pharyngeal slits

Question 2

Hemichordates have a ___________which was formerly thought to be the notochord.

Answer 2

stomochord

Question 3

Is there an iodine-binding tissue in hemichordates?

Answer 3

No

Question 4

Do hemichordates have a post-anal tail?

Answer 4

No

Question 5

Why are hemichordates said to be related to chordates?

Answer 5

Because they possess similar larvae similar to those of Echinodermata

Question 6

Hemichordates are recognized by two classes, what are they?

Answer 6

enteropneusta (acorn worms) and pterobranchia

Question 7

The body of the acorn worm has three parts what are they?

Answer 7

proboscis, collar, and trunk

Question 8

what are the functions of the proboscis and collar of the acorn worm?

Answer 8

used for burrowing and locomotion

Question 9

what is on the surface of the proboscis of the acorn worm?

Answer 9

cilia

Question 10

what does the cilia on the proboscis do?

Answer 10

creates currents that flow over the mucus covering the proboscis. microorganisms, particles, and water are then traveled to the mouth by the cilia

Question 11

where is the mouth of an acorn worm?

Answer 11

lies ventral and anterior to the collar and opens into the pharynx

Question 12

what do pharyngeal pores do in the acorn worm?

Answer 12

allow water to be directed in the pharynx