Platyhelminthes: General Features

Question 1

Platyhelminthes are all hermaphroditic with the exception of the blood fluke.
True
False

Answer 1

True

Question 2

2. Others have argued that flatworms have descended from _____ ancestors.

Answer 2

{Coelomates| coelomates}

Question 3

The digestive tract of Platyhelminthes is incomplete and opens only to the exterior, or mouth.
True
False

Answer 3

True

Question 4

4. Of the Phylum Platyhelminthes, which of the following flatworms are parasitic to humans?
   a. Trematoda and Digenea
   b. Trematoda and Cercomeromorphae
   c. Aspidobothrea and Trematoda
   d. None of the above

Answer 4

b. Trematoda and Cercomeromorphae

Question 5

5. Associated with the plasma membrane of digenetic trematodes is a surface coat called the _______ that varies in thickness according to species
   a. syncytium
   b. glycocalyx
   c. distal cystoplasm
   d. gastrodermis

Answer 5

b. glycocalyx

Question 6

6. Hydrolytic enzymatic activity in the glycocalyx facilitates the uptake of certain molecules such as sugars and amino acids from the environment.
   True
   False

Answer 6

True

Question 7

7. The underlying tegument, or subtegumental zone, consists of which three layers of muscle?
   a. longitudinal, circular, and diagonal
   b. circular, lateral, and diagonal
   c. diagonal, contractile and lateral
   d. none of the above

Answer 7

a. longitudinal, circular, and diagonal

Question 8

8. The osmoregulatory system of digenetic trematodes is of the typical protonephridial type.
   True
   False

Answer 8

True

Question 9

9. Digenetic trematodes are hermaphroditic with the exception of which genus?
   a. schistosomes
   b. cestodes
   c. cercaria
   d. none of the above

Answer 9

a. schistosomes

Question 10

10. Some flukes are able to produce up to 25,000 eggs per day.
    True
    False

Answer 10

True

Question 11

11. In some species a muscular, distal portion of the uterus, a metraterm, helps propel the eggs out of the uterus as well as aids in copulation.
    True
    False

Answer 11

True

Question 12

12. Which of the following is NOT a general characteristic of Platyhelminthes?
    a. The two important classes are trematoda and cestoidea
    b. They are dorsoventrally flattened
    c. They are known as flatworms
    d. They have a large body cavity
    e. They are hermaphroditic

Answer 12

d. They have a large body cavity

Question 13

13. Flatworms generally have:
    a. No body cavity
    b. No specialized circulatory system
    c. No specialized respiratory system
    d. All of the above

Answer 13

d. All of the above

Question 14

14. The only genera out of the class Trematoda that lives in and ingests blood is Schistosoma.
    True
    False

Answer 14

True

Question 15

15. Which of the following pertains to class Trematoda?
    a. complete digestive system
    b. true segmentation
    c. non-parasitic ectoparasites
    d. hermaphroditic

Answer 15

d. hermaphroditic

Question 16

16. The tegument comes in contact with the immune system.
    True
    False

Answer 16

True

Question 17

17. The first intermediate host of digenea is:
    a. Fish
    b. Gastropods
    c. Pigs
    d. Sheep

Answer 17

b. Gastropods

Question 18

18. What body part of the male Schistosomes allow female Schistosomes to reside in?
    a. Caecum
    b. Gynecophoral Canal
    c. Ventral Canal
    d. Vitelline Gland

Answer 18

b. Gynecophoral Canal

Question 19

19. The organisms of subclass digenea go through at least 2 hosts during their particular developmental stages. Part of this development occurs in _________ for almost all of these organisms, while they reside in another host, usually _________, during their adult life cycle.
    a. snails; invertebrates
    b. wasps invertebrates
    c. snails; vertebrates
    d. wasps; vertebrates

Answer 19

c. snails; vertebrates

Question 20

20. Flukes have asexual and sexual generations. They usually reproduce sexually in mollusks/snails and asexually in vertebrate hosts.
    True
    False

Answer 20

False

Question 21

21. Which of the following is true of the tegument?
    a. Spines within the tegument are indistinguishable from the microtriches of cestodes
    b. Cells of the tegument have clearly defined boundaries
    c. The outer membrane surface is referred to as the glycocalyx
    d. A and B are true
    e. All of the above are true

Answer 21

c. The outer membrane surface is referred to as the glycocalyx

Question 22

22. Eggs in a human infection by Taenia solium are immature when they release from the gravid proglottid.
    True
    False

Answer 22

False

Question 23

23. In regions where T. solium is endemic, ______ of patients with seizures have antibodies to T. solium.
    a. 0%
    b. 25%
    c. 33%
    d. 66%

Answer 23

c. 33%

Question 24

24. Which of the following are extremely long and have no mouth so mostly consumes nutrients via diffusion?
    a. Trematodes
    b. Cestodes
    c. Nematodes
    d. Arthropods

Answer 24

b. Cestodes

Question 25

25. Which of the following is not one of the major subdivisions of a flatworm?
    a. scolex
    b. neck
    c. strobila
    d. proglottids

Answer 25

d. proglottids

Question 26

26. Which of the following are true of fluke eggs?
    a. They must be passed out of the host
    b. They may be passed in feces
    c. They are for terrestrial environs
    d. they are for aquatic environs
    e. All of the above

Answer 26

e. All of the above

Question 27

27. How many different digenetic flukes species can infect mammals?
    a. 5400
    b. 4500
    c. 9700
    d. 7000

Answer 27

b. 4500

Question 28

28. Digenetic trematodes from the schistosomes genus are hermaphroditic.
    True
    False

Answer 28

False