mt2key2 - BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY...

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1 BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY Winter 2005 Questions 1-12: Multiple choice questions (4 points each; total 48 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. Land dwelling molluscs and terrestrial segmented worms share which of the following essential adaptations for invasion of terrestrial habitat a. extended larval development to overcome dry conditions b. loss of the trochophore c. development of a nacreous cuticular layer for water retention d. loss of the circum-esophageal ring e. development of radial muscles Answer: b 2. Torsion in molluscs is a. a developmental process found in gastropods and bivalves b. found in all molluscs that don’t have a coiled shell c. a process by which chromatophores are regulated in cephalopods d. a process independent of shell coiling, although often seen in molluscs with coiled shells e. found only in cephalopods Answer: d. 3. Which of the following coelomate traits are not found in pseudocoelomate animals? a. hydrostatic skeleton b. digestive tract with a mesodermal tissue covering c. mesenchyme tissue d. complete digestive tract e. an internal cavity containing the gut and organs Answer: b 4. The mechanism by which vicariance may redistribute organisms a. consists of such dispersal processes as riding jet streams or rafting on logs. b. mimics the process of sympatric speciation c. likely accounts for the present day distribution of lungfishes d. causes distribution of paraphyletic and polyphyletic species to be correlated e. accounts for the distribution of New and Old World monkeys Answer: c 5. Female sponges (Porifera) may reproduce by a. producing gemmules- internal buds which are fertilized by male sponges b. fragmenting into small parts each of which then unites with a male sponge fragment c. using mesoderm to trap sperm or eggs released from the mesoderm of nearby sponges d. totipotency e: none of the above is true Answer: e
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2 6. You have discovered a free-living developmental stage of an organism that completely differs in structure from the adult stage of the same species. This kind of developmental stage is a. not found in sponges b. found in no mollusc c. present in cephalopods
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mt2key2 - BIS 1B Midterm 2 Rosenheim and Kimsey ANSWER KEY...

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