Chapter 28.2 (learned before 1)

Question 1

What is the phylum of segmented worms?

Answer 1

Annelida

Question 2

What do clitellates look like when they hatch?

Answer 2

Miniature adults

Question 3

What type of body cavity do earthworms have?

Answer 3

Coelomates

Question 4

What level of organization do annelids have?

Answer 4

Organ systems

Question 5

What are the external bristles of some annelids called?

Answer 5

Setae

Question 6

What innovation/change did annelids bring?

Answer 6

Repeated body segments

Question 7

What separates the body segments?

Answer 7

Septa

Question 8

What three types of organs does the cavity of annelids contain?

Answer 8

Digestive, excretory, circulatory (and movement)

Question 9

What does the netanephridia do?

Answer 9

Aid in waste removal

Question 10

What type of circulatory system do annelids have?

Answer 10

Closed

Question 11

What two things does segmentation help with?

Answer 11

Greater freedom of movement and greater complexity of body organization

Question 12

What type of “brain” do annelids have?

Answer 12

Well-developed cerebral ganglia

Question 13

How do annelids reproduce and what do they form if they are a polychaete?

Answer 13

Sexually, forming a trochophore larval form that emerges from an egg

Question 14

What are parapodia?

Answer 14

Flap-shaped appendages used for gas exchange and locomotion

Question 15

How are annelids grouped? (2)

Answer 15

Presence/absence of setae/parapodia

Question 16

What are the largest group of annelids?

Answer 16

Polychaetes

Question 17

What do polychaetes have? (grouping factors)

Answer 17

A pair of parapodia and they usually also have setae

Question 18

What structures do polychaetes have? (body shape, color, head/arms, other)

Answer 18

Unusual forms, iridescent colors, a well-developed head, sensory structures

Question 19

What is an example of an oligochaete and what grouping factors do they have?

Answer 19

Earthworm, no parapodia and only a few setae

Question 20

What features do earthworms lack?

Answer 20

A distinctive head region and eyes

Question 21

Describe crop, gizzard, and castings

Answer 21

Crop-storage area in earthworm bodies, gizzard-area in earthworms that grind up food, castings-undigested poop of earthworms (used for fertilizer)

Question 22

Where do most leeches live?

Answer 22

Fresh water

Question 23

What does a leech have at both ends?

Answer 23

Suckers

Question 24

What are the three things that leeches lack?

Answer 24

Setae, parapodia, septa

Question 25

How do most leeches get their food?

Answer 25

Hunting/scavenging

Question 26

What is the name for anti-clotting chemicals?

Answer 26

Anticoagulant

Question 27

What is the name for pain-numbing chemicals?

Answer 27

Anesthetic

Question 28

What is the strongest anti-clotting chemical that leeches produce and how do humans get it?

Answer 28

Hirudin, genetic engineering