Lesson 20 Terms

Question 1

Annelida

Answer 1

segmented worms

Question 2

Aortic arches

Answer 2

function as tiny hearts that pump blood through the blood vessels

Question 3

Clitellum

Answer 3

a barrel-shaped swelling around the body that assists in reproduction

Question 4

Complete digestive system:

digestive system consisting of —–

Answer 4

digestive system consisting of a digestive tract and two body openings;

Question 5

Worms use a shovel-like upper lip to scoop soil into their mouth and pass it into the pharynx.
It then moves to…

Answer 5

It then moves to the crop, and finally, the gizzard (stomach) where muscular contractions grind the soil

Question 6

Cuticle function- roundworms

Answer 6

protects roundworms from the digestive enzymes of the host

Question 7

Eyespots

Answer 7

sense light

Question 8

Flatworms

Answer 8

Flatworms
1. Parasitic flatworms: organisms that live on or in another organism and benefit by taking nutrients from that organism at the expense of the host

Question 9

Free-living Flatworms live —–

Answer 9

2. Free-living flatworms: can live on land, in the ocean, or in fresh water

Question 10

How many classes of flatworms?

Answer 10

3. Three classes of flatworms:
   a) Flukes (parasitic)
   b) Tapeworms (parasitic)
   c) Planarians (free-living)

Question 11

Flukes

Answer 11

parasitic flatworms; require at least two hosts and spend part of their lives in snails

Question 12

Ganglion

Answer 12

mass of nerve cells that functions like a simple “brain” in the anterior

Question 13

Nematoda

Answer 13

roundworms

Question 14

Nephridia

Answer 14

coiled tubes that are open at both ends and function as tiny kidneys

Question 15

Nephridia

Answer 15

coiled tubes that are open at both ends and function as tiny kidneys

Question 16

Parasites

Answer 16

organisms that live off of other organisms

Question 17

Peristalsis

Answer 17

a wave-like process that moves food through the digestive system

Question 18

Peristalsis

Answer 18

a wave-like process that moves food through the digestive system

Question 19

Planarians

Answer 19

free-living flatworms

Question 19

Planarians

Answer 19

free-living flatworms

Question 20

Platyhelminthes

Answer 20

flatworms

Question 21

Roundworms

Answer 21

1. Bodies resemble a thread
2. Live in nearly every environment
3. Can be free-living or parasitic

Question 22

Scolex

Answer 22

small, knoblike head of a tapeworm

Question 23

Segmented worms

Answer 23

1. Bodies appear to have ringed segments
2. Found in different habitats
3. Parasitic and free-living species

Question 24

Setae

Answer 24

bristle-like structures that help segmented worms move

Question 25

parasitic flatworm; have no mouth or digestive system, but absorb nutrients from their host

Answer 25

Tapeworms