Platyhelminthes Lab Questions

Question 1

Define platyhelminthes

Answer 1

The flatworms

Question 2

What are the major classes?

Answer 2

Turbellaria (dugesia)
Trematoda (flukes)
Cestoda (tapeworms)

Question 3

How do platyhelminthes feed?

Answer 3

absorption

Question 4

How do platyhelminthes respire?

Answer 4

Diffusion

Question 5

What type of body cavity do they have?

Answer 5

Aceloments (no body cavity) only gut cavity

Question 6

What kind of digestive tract do they have?

Answer 6

Incomplete (one opening)

Question 7

What would be the advantage of a branched gut cavity?

Answer 7

Greater surface area for absorption

Question 8

How do they reproduce?

Answer 8

Both sexually and asexually (some only sexual like tapeworms and flukes)

Question 9

What is the purpose of the tegument (cuticle)?

Answer 9

-Protect from host’s digestive/immune system
-Absorption of food

Question 10

How many germ layers? Tissues? Organ systems?

Answer 10

-3 germ layers (ectoderm, endoderm, and mesoderm) Triploblastic
-Yes, they have tissues.
-Yes an organ system: Nephridia, earliest form of a kidney

Question 11

What is the symmetry?

Answer 11

bilateral

Question 12

What is cephalization?

Answer 12

brain and sense organs in front of the animal
-ex eyespots

Question 13

Which classes are parasidic?

Answer 13

All but turbellaria

Question 14

What are ocelli?

Answer 14

Sense organs used for light detection

Question 15

What are flame cells?

Answer 15

Flagella are grouped into a flame-like
cluster at the end of nephridia. Beat and drive fluid down ducts to the outside through nephridiopores.

Question 16

Scolex

Answer 16

The region containing the organs necessary to attatch to the host. Contains suckers or hooks

Question 17

What are proglottids?

Answer 17

Self reproduction, each proglottid released thousands of eggs through the hosts feces