Exam 33: Invertebrates

Our understanding of many of the evolutionary relationships among animals changed after those phylogenies were based on morphological and molecular data (as opposed to only using morphological data). Which of the following groups represents an example of this change?

Which phylum is characterized by animals that have a segmented body?

The increase in plant species diversity is correlated with which of the following events?

Soft-shell crab is a prized dish in many ocean-side resorts. Which of the following statements provides the best explanation for the soft shell of the crabs?

Which of the following characteristics is exhibited by the water vascular system of echinoderms?

Sexual reproduction leads to increased genetic variation, but male bdelloid rotifers have never been observed. Which of the following are correct statements with regard to evolution in bdelloid rotifers?

The water vascular system of echinoderms ________.

Which of the following combinations of phylum and description is incorrect?

Which of the following statements correctly describes one difference between nematodes and arthropods?

Which sponge cell is most structurally and functionally similar to the cnidocyte of a cnidarian?

Which one of these mollusc groups is classified as suspension feeders?

If you brush your fingers along the tentacles of a sea anemone, which of the following are you most likely to find upon microscopic examination of your fingers?

Which of the following animal groups is entirely aquatic?

Which of the following characteristics is exhibited by most hydrozoans?

In the below figure, assume that the two medusae shown at step 4 were produced by one polyp colony. Review Concept 12.1 and Concept 13.3, and then use your understanding of mitosis and meiosis to select which of the following is true.

Which of the following characteristics do all insects exhibit?

In a tide pool, a student encounters an organism with a hard outer covering that contains a large amount calcium carbonate, an open circulatory system, and gills. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which of the following structures would allow for the most definitive identification of the organism?

Against which of the following do the circular and longitudinal muscles of annelids work?

Which of the following structures can be found in the mesohyl of a sponge?

Echinoderms show enormous diversity in which of the following traits?