Section 27-3

Question 1

Of what phylum are earthworms a member?

Answer 1

Annelida

Question 2

What evidence is there that annelids are more closely related to clams and snails than to flatworms or roundworms?

Answer 2

Annelids, clams, ans snails all share a similar larval stage

Question 3

What is a septum?

Answer 3

Internal walls between each segment of the body of annelids

Question 4

Attached to each annelid segment are bristles called _________

Answer 4

Setae

Question 5

Annelids are among the simplest animals to have a true __________

Answer 5

Coelom

Question 6

How is the pharynx used differently in carnivorous species than in annelids that feed on decaying vegetation

Answer 6

In carnivorous species the pharynx usually holds two or more sharp jaws that are used to attack prey

Question 7

What is closed circulatory system?

Answer 7

It is when blood is contained within a network of blood vessels

Question 8

What is a gill?

Answer 8

An organ specialized for the exchange of gases underwater

Question 9

How do aquatic annelids respire differently than land dwelling annelids?

Answer 9

Aquatic annelids often breathe through a gill which exchanges gases underwater. Land dwelling annelids take in oxygen and give off carbon dioxide through their moist skin

Question 10

How do annelids keep their skin moist?

Answer 10

Annelids secrete thin protective coating of mucas which keeps their skin moist

Question 11

What are the two major groups of body muscles in annelids called?

Answer 11

Longitudinal muscles
Circular muscles

Question 12

Marine annelids have paddlelike appendages called ____________

Answer 12

Parapodia

Question 13

What is clitellum, and what I’d it’s function?

Answer 13

A band of thickend, specialized segments, secretes a mucous ring into which eggs and sperm are released

Question 14

Write the description and habitat or earthworms

Answer 14

Long, pinkish-brown worms with few setae
Woods, fields and gardens

Question 15

Write the description and habitat for tubifex worms

Answer 15

Red, threadlike worms with few setae
Aquatic areas

Question 16

Circle the letter of each sentence that is true about leeches
A.) They suck blood and body fluids from their hosts
B.) Most live in moist, tropical habitats
C.) They are typically external parasites
D.) All are carnivores that feed on snails

Answer 16

A
B
C

Question 17

Circle the letter of each sentence that is true about polychaetes
A.) They typically have only a few setae
B.) They have paired, paddlelike appendages tipped with setae
C.) They suck the blood of their host
D.) They are marine annelids

Answer 17

B
D

Question 18

What do annelids do polychaetes include?

Answer 18

Sandworms, bloodworms and their relatives

Question 19

How do the tunnels of earthworms affect other organisms?

Answer 19

They provide passageways for plant roots and water and allow the growth of beneficial oxygen requiring soil bacteria

Question 20

Circle the letter of each sentence that is true about annelids
A.) Earthworms are important to the diet of birds
B.) Annelids bring minerals from deep soil layers to the surface
C.) Marine annelids spend their lives burrowing through soil
D.) Annelid larvae form part of the animal plankton

Answer 20

A
B
D