BSsq-lect15-16 moll

BSsq-lect15-16 moll - BIS 1B(Winter 2008 Study Questions...

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BIS 1B (Winter 2008) Study Questions: Mollusca Lectures 15 and 16 1. Using what you know about surface area to volume ratios and about countercurrent exchangers, explain why your fingers get colder than your palms on cold days. What does this question have to do with mollusks? 2. There is a debate among zoologists about the relationship between annelids and mollusks. Can you summarize the arguments for and against a relationship? 3. What is the difference between hermaphroditism and parthenogenesis? What are some possible advantages and disadvantages of each mode of reproduction? (Hint: think in terms of both population numbers and genetic variance.) 4. Mollusks have been major objects of study among paleontologists. Why do you think this might be so? 5. What are the advantages of a shell in mollusks? Are the advantages the same for cephalopods and bottom or land living mollusks? Many mollusks have secondarily lost their shells. Have they compensated in any way for this loss?
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