Exam 33: An Introduction to Invertebrates

The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelom,an alimentary canal,and an outer covering that is occasionally shed.To which phylum does the heartworm belong?

Among the invertebrate phyla,phylum Arthropoda is unique in possessing members that have

The teacher was unaware of the difference between suspension feeding and predation.The teacher thought that providing live copepods (2 mm long)and feeder fish (2 cm long)would satisfy the dietary needs of all of the organisms.Consequently,which two organisms would have been among the first to starve to death (assuming they lack photosynthetic endosymbionts)?

Which of the following combinations correctly matches a phylum to its description?

The nematocysts of sea slugs should be most effective at protecting individual sea slugs from predation if the predators

Humans most frequently acquire trichinosis by

The great success of insects on land can be attributed to which key adaptation?

Which characteristic(s)is (are)shared by both cnidarians and flatworms?

You find what you believe is a new species of animal.Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?

Which of the following is a major disadvantage of exoskeletons?

Which clade in the phylum Cnidaria includes "jellies" with rounded (as opposed to boxlike)medusae?

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

You find a small animal with eight legs crawling up your bedroom wall.Closer examination will probably reveal that this animal has

Use the following information to answer the questions below. A farm pond,usually dry during winter,has plenty of water and aquatic pond life during the summer.One summer,Sarah returns to the family farm from university.Observing the pond,she is fascinated by some six-legged organisms that can crawl about on submerged surfaces or,when disturbed,seemingly "jet" through the water.Watching further,she is able to conclude that the "mystery organisms" are ambush predators,and their prey includes everything from insects to small fish and tadpoles. -Sarah noticed the presence of many empty exoskeletons attached to emergent vegetation.These exoskeletons looked exactly like those of the largest of the "mystery organism" she had seen in the pond.They also looked similar to the bodies of the dragonflies that patrolled the surface of the pond.If Sarah had learned a lot from her biology class,what should she have concluded about the mysterious pond organisms?

-Which of the following factors,when used to label the horizontal axis of the above graph,would account most directly for the shape of the plot?

Which chemical is synthesized by some sponges and acts as an antibiotic?

A sponge's structural materials (spicules,spongin)are manufactured by the

Which of the following is a characteristic of nematodes?

One should expect to find the "9 + 2 pattern" of microtubules in association with the feeding apparatus of which of the following?

The teacher and class were especially saddened when the colonial hydrozoan died.They had watched it carefully,and the unfortunate creature never even got to produce offspring by budding.Yet,everyone was elated when Tommy (now recovered)noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony.The teacher was apparently unaware that these hydrozoans exhibit