The water-vascular system of echinoderms

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Reference no: EM133935272

Questions

1. Ancylostoma and Necator are also known as hookworms.

True
False

2. The pseudocoelom of nematodes contains a layer of mesoderm on both the inner body wall and the intestinal tract.

True
False

3. Unlike many bilateral animals, nematode muscles extend to the nerve cords.

True
False

4. Parasitic filarial nematodes are spread by eggs.

True
False

5. The cuticle of nematodes acts like circular muscles in a hydrostatic skeleton.

True
False

6. All nematodes are parasitic.

True
False

7. Roundworms like Ascaris spread to new hosts by

waling barefoot on moist ground

insect bites

cuts and scrapes

fecal-oral route

8. Nematodes that parasitize the wrong species may travel through the tissues of the host. This is know as

filariasis

ascariasis

Visceral larval migrans

mange

9. Which of the following genera produce filaria

Dirofilaria

Ascaris

Onchocerca

Trichuris

10. The only group of chordates which have all of the group characteristics in adulthood is Urochordata.

True
False

11. Chordates differ from other animal phyla because they have a ventral nerve cord.

True
False

12. Sea lilies (crinoids) use their ambulacral grooves to move food towards their mouths.

True
False

13. Brittle stars differ from sea stars in that brittle stars do not have organs in their rays.

True
False

14. Members of Phylum Echinodermata may be found in both fresh and salt water habitats.

True
False

15. Members of Class Holothuroidea have short oral/aboral axes.

True
False

16. In the deuterostome blastula, the blastopore develops into the

mouth

anus

coelom

morula

17. Echinoderms are considered to be secondarily pentaradial because

the larval form is simple pentaradial

the larval form is bilateral

the larval form is asymmetrical

the adult form is bilateral

18. Regulative blastomeres

are able to develop into incomplete embryos

must fuse together in order to form a complete embryo

are able to develop into complete embryos

non of the above are true

19. The water-vascular system of echinoderms

is used for movement

uses the madreporite as the entry point

is considered to be a coelomic cavity

Reference no: EM133935272

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