Download Flatworms Quiz Answers

Flatworms Quiz Answers
1. True or False: The flatworms are the first significant phylum with
bilateral symmetry.
true 2. True or False: Most flatworms are parasites.
true 3. What is a host organism? What is the role of the host?
A host organism is the organism that a parasite lives inside. The host provides the food and energy the parasite needs. 4. Where do tapeworms live? How does a tapeworm attach to the place
where it lives?
Tapeworms live in the intestine of a host organism. They attach to the intestine using their scolex, a head-­‐like area with tiny hooks and suckers. 5. Describe a worm.
Worms are animals (usually invertebrates) that have long bodies with no arms or legs. 6. How does respiration occur in flatworms?
a) Respiration occurs by the movement of oxygen over the gills.
b) Respiration occurs by the diffusion of oxygen into the lungs.
c) Respiration occurs by the diffusion of oxygen into the worm body.
d) All of the above methods are used by worms to respire.
7. What is cephalization?
a) Cephalization is the development of a head region.
b) Cephalization refers to the flatworms head region.
c) Cephalization includes the two eye spots.
d) Cephalization is the development of the nerve net running the length of the
flatworm body.
8. How are nutrients distributed throughout the flatworm?
a) Nutrients are carried by the blood through the flatworm.
b) Nutrients are distributed by diffusion.
c) Nutrients are distributed by the digestive tract.
d) Nutrients are distributed by the gastrovascular cavity.
9. Which best describes the flatworm digestive system?
a) Flatworms have a complete digestive system, with two openings, a mouth
and an anus.
b) Flatworms have an incomplete digestive system, with two openings, a mouth
and an anus.
c) Flatworms have an incomplete digestive system, with just one opening.
d) Flatworms do not have a digestive system.
10. A body cavity usually refers to the space located between an animal’s
outer covering and the outer lining of the gut cavity. Coelomates have
a complete body cavity where organs attach and develop.
Pseudocoelomates have a body cavity that loosely holds organs in
place. Acoelomates do not have a body cavity. What type of animals
are flatworms?
a) coelomates
b) pseudocoelomates
c) acoelomates
d) none of the above