Invertebrates Multiple Choice Questions and Answers

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

22. A lophophore is used by ectoprocts and brachiopods

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

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

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

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

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

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

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

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

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

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

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

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

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

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. chitons
2. bivalves
3. gastropods
4. cephalopods

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

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