Exam 32: An Introduction to Animals

Figure 32.1 -As you are on the way to Tahiti for a vacation,your plane crash-lands on a previously undiscovered island.You soon find that the island is teeming with unfamiliar organisms;and you,as a student of biology,decide to survey them (with the aid of the Insta-Lab Portable Laboratory you brought along in your suitcase).You select three organisms and observe them in detail,making the notations found in Figure 32.1.Which organism would you classify as an animal?

An organism that exhibits cephalization probably also _____.

Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells.Which of the following would be a likely mechanism by which this pesticide works?

In examining an unknown animal species during its embryonic development,how can you be sure what you are looking at is a protostome and not a deuterostome?

If you think of the tube-within-a-tube body plan as a pipe with a straw inside,where would you expect to find most of the ectodermal,mesodermal,and endodermal germ layers,respectively?

Parasitism is one of the most widespread life strategies ever to evolve.Which of the following is consistent with this finding?

Which of the following is true of the sponges?

All of the following are true about choanoflagellates except _____.

To reproduce,many plants produce seeds-structures containing embryonic offspring along with nutrients inside a tough case.These offspring develop after being released by the parent plant.To which animal reproductive strategy is seed production most comparable?

Why are healthy corals brightly colored?

Following the fusion of gametes in Obelia,the resulting cell divides via mitosis to become a _____.

Most fish deposit fertilized eggs,but some sharks keep the fertilized egg inside the female until she gives birth to a relatively well-developed pup.These sharks would thus be characterized as _____.

Comb jellies may not be the most familiar animal to you,but they are critical in the food chain because they make up a significant portion of the planktonic biomass.Their feeding strategy is predatory and involves adhesives or mucus on their tentacles or other body parts.What feeding tactic do these animals use?

What do all sponges have in common?

Which of the following is most likely to be aquatic?

Suppose you came across a novel organism you suspected belonged to one of the following animal phyla: Porifera,Cnidaria,Ctenophora,or Acoelomorpha.Which of the following characteristics would not be helpful in placing the organism into the correct phylum?

The digestive system of most animals is lined with cells through which nutrients are absorbed.What is the embryonic origin of these cells?

If humans were characterized as undergoing metamorphosis,human development from infant to adult would be better described as _____,and human infants would be described as _____.