Name: 

Flat and Round Worms

 
True/False
Indicate whether the sentence or statement is true or false.
 

1. 

Planarians have a branched digestive tract with both a mouth and an anus.
 

2. 

Most flatworms are not parasitic.
 

3. 

Tapeworms absorb food from their host’s intestine directly through their skin.
 

4. 

Humans can avoid trichinosis by wearing shoes when they walk through fields.
 

5. 

Rotifers have a distinct head end with a mouth and a distinct tail end that has an opening through which substances from the digestive, reproductive, and excretory systems exit the body.
 
 
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

6. 

Flatworms can reproduce asexually by
a.
fission.
c.
producing polyps.
b.
forming larvae.
d.
exchanging both sperm and eggs.
 

7. 

Which of the following is not found in flatworms?
a.
a head
c.
bilateral symmetry
b.
a circulatory system
d.
a nervous system
 

8. 

Flatworms have no need for circulatory and respiratory systems because
a.
the digestive system performs these functions.
b.
their cells are close to the animal’s exterior surface.
c.
the spherical body shape allows diffusion of materials into tissues.
d.
the coelom is bathed in blood and oxygen.
 

9. 

Schistosomiasis is a disease caused by a
a.
roundworm.
c.
cestode.
b.
trematode.
d.
planarian.
 

10. 

turbellarians : free living ::
a.
planaria : parasitic
c.
cestodes : free living
b.
tapeworms : free living
d.
flukes : parasitic
 

11. 

Which of the following statements about tapeworms is false?
a.
They can infect a person who eats improperly cooked beef.
b.
They belong to the genus Schistosoma.
c.
They can grow to be large in human intestines.
d.
These flatworms do not have a digestive system.
 

12. 

To which phylum do roundworms belong?
a.
Annelida
c.
Platyhelminthes
b.
Nematoda
d.
Arthropoda
 

13. 

Roundworms have a fluid-filled cavity between the gut and body wall called a
a.
coelom.
c.
digestive system.
b.
pseudocoelom.
d.
None of the above
 

14. 

Pseudocoelomates
a.
must move rapidly to enhance diffusion of nutrients.
b.
must be very small or have body shapes with short distances between organs and the body surface.
c.
must have a circulatory system.
d.
All of the above
 

15. 

The first organisms to develop an internal body cavity were the
a.
flatworms.
c.
mollusks.
b.
nematodes.
d.
arthropods.
 

16. 

All of the following groups of invertebrates are coelomates, except
a.
annelids.
c.
mollusks.
b.
echinoderms.
d.
nematodes.
 

17. 

The evolution of body cavities was important because
a.
fluids within the body cavity aid in circulation of materials from one part of the body to another.
b.
fluids in the cavity make the body rigid and offer resistance to muscles, aiding in movement.
c.
organs are better able to function if they can move freely within the body cavity.
d.
All of the above
 

18. 

The nematode Ascaris lumbricoides infects humans, spending most of its adult life inside the intestines of its host. To be infected, a person must
a.
consume the nematode’s eggs.
c.
sit on an infested toilet seat.
b.
walk barefoot on infested soil.
d.
All of the above
 

19. 

A type of roundworm that lives a parasitic life is
a.
Ascaris.
c.
Trichinella.
b.
Necator.
d.
All of the above
 

20. 

Rotifers eliminate excess water that they collect from their freshwater environment by
a.
diffusion.
c.
flame cells and excretory tubules.
b.
kidneys.
d.
a mastax.
 



 
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