Exam 30: An Introduction to Animals

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?

The evolution of animal species has been prolific the estimates go into the millions and tens of millions). To what does the text attribute much of this diversity?

A typical ectoparasite has all of the following characteristics EXCEPT that it

Due to its unusual habitat inside the digestive tracts of other animals), the tapeworm lacks

What do all sponges have in common?

From the information provided in the figure above, how would you classify the feeding strategy of organism C?

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. How would these sharks be characterized?

The embryo doesn't grow larger during the stage known as cleavage. What is going on in the embryo during this process?

Phylum Dll Activity in Developing Appendages Annelida Yes Arthropoda Yes Chordata No Echinodermata No Mollusca Yes Figure 30.4 -Dll is a gene known to direct limb development in the fruit fly. Researchers studying this gene have found that it is also expressed in developing appendages in animals from many other phyla as well, supporting the hypothesis that all animal appendages may be homologous. However, suppose researchers looking at Dll activity had instead found the results shown in Figure 30.4. What would these results suggest?

Which of the following combinations of embryonic features is common in the deuterostomes?

All of the following are true about choanoflagellates EXCEPT

Why might researchers choose to use molecular data such as ribosomal RNA sequences) rather than morphological data to study the evolutionary history of animals?

Most cnidarians are known to produce toxins. In fact, it has been claimed that one particular species produces the most deadly of all toxins on the planet. What feature of this group most likely evolved simultaneously with the development of these toxins?

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?

Which of the following species would you not classify as an animal?

Figure 30.1 -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, as a student of biology, you 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 30.1. Which organism would you classify as an animal?

Why are healthy corals brightly coloured?

Which of the following statements concerning animal taxonomy is/are true? 1) Animals are more closely related to plants than to fungi. 2) All animal clades based on body plan have been found to be incorrect. 3) Kingdom Animalia is monophyletic. 4) Animals only reproduce sexually. 5) Animals are thought to have evolved from flagellated protists similar to modern choanoflagellates.

Which of the following is not a feature of the tube- within- a- tube body plan in most animals?