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BS2007Exam2 - BIS 1B Midterm 2 Lawler and Kimsey Winter...

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BIS 1B Midterm 2. Lawler and Kimsey Winter 2007 Questions 1-15: Multiple choice questions (3 points each; total 45 points) Select one best answer and mark SCANTRON form using a #2 pencil. Be sure to put your name and student ID on the SCANTRON (and circle answer on the exam). 1. The pseudocoelomate phyla may be distinguished from the other phyla we have studied so far in that they uniquely possess a. a spongy mass of irregular cells in a gelatinous matrix called mesenchyme b. a space between the gut and the body wall, but only the body wall is completely covered with a mesodermal lining c. no body cavity; internal organs and gut are contained in a solid matrix of mesodermal parenchyma d. a space between the enteron and the body wall, and the enteron is covered with mesoderm e. embryonic traits that persist into adulthood 2. What are some advantages of 'alternation of generations' in Cnidarian body forms? a. a different body form makes the individual less conspicuous to predators b. it allows an individual to reproduce as both a male and a female c. it allows the species to multiply in good habitats plus have an effective dispersal stage d. a species can occur in small forms to fit into small spaces, plus large forms for open areas. e. both B and D 3. In which of the following ways are Echinodermata known to feed?
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