Invertebrates Multiple Choice Questions and Answers for Practice

16. What would be the most effective method of reducing the incidence of blood flukes in a human population?

1. Purify all drinking water.
2. Avoid contact with rodent droppings.
3. Reduce the mosquito population.
4. Reduce the freshwater snail population.

17. The larvae of many common tapeworm species that infect humans are usually found

1. crawling in the abdominal blood vessels of cows and pigs.
2. encysted in the human brain.
3. encysted in freshwater snails.
4. encysted in the muscles of an animal, such as a cow or pig.

18. While vacationing in a country that lacks adequate meat inspection, a student ate undercooked ground beef.Sometime later the student became easily fatigued, and lost body weight. At about the same time, whitish,flattened, rectangular objects full of small white spheres started appearing in his feces. Administration of niclosamide cured the problem. The student had probably been infected by a

1. nematode.
2. tapeworm.
3. pinworm.
4. hookworm.

19. Which of the following correctly characterizes the phylum Rotifera?

1. parthenogenic reproduction
2. inability to persist in environments where they might undergo desiccation
3. a single-opening digestive tract
4. a pair of mandibles made of chitin

20. Which of the following statements about tapeworm feeding methods is correct?

1. They absorb nutrients across their body walls.
2. They are autotrophic.
3. They have complete digestive tracts.
4. They use degenerate mouths to ingest some of their food.

21. While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The studentrears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. Theembryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged toa(n)

1. mollusc.
2. nematode.
3. chordate.
4. echinoderm.

22. A lophophore is used by ectoprocts and brachiopods

1. for feeding.
2. for sensory reception.
3. for locomotion.
4. at a larval stage.

23. A brachiopod can be distinguished from a bivalve by the presence of

1. a lophophore.
2. suspension feeding.
3. two hinged shells.
4. a digestive system with separate mouth and anus.

24. If a lung were to be found in a mollusc, where would it be located?

1. foot
2. visceral mass
3. mantle cavity
4. coelom

25. Which molluscan class includes members that undergo embryonic torsion?

1. gastropods
2. cephalopods
3. chitons
4. bivalves

26. A terrestrial mollusc without a shell belongs to which class?

1. gastropods
2. cephalopods
3. chitons
4. bivalves

27. Which molluscan class includes marine organisms whose shell consists of eight plates?

1. gastropods
2. cephalopods
3. chitons
4. bivalves

28. A radula is present in members of which class(es)?

1. gastropods
2. cephalopods
3. chitons
4. bivalves

29. While snorkeling, a student observes an active marine animal that has a series of muscular tentacles bearing suckers associated with its head. Segmentation is not observed, but a pair of large, well-developed eyes is evident. The student is observing an animal belonging to which class?

1. gastropods
2. cephalopods
3. chitons
4. bivalves

30. Which molluscan class includes organisms that are primarily suspension feeders?

1. gastropods
2. cephalopods
3. chitons
4. bivalves