Exam 4 - PLB 105 Heather Hallen Exam 4 Questions What is a...

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PLB 105 Heather Hallen Exam 4 Questions What is a possible problem with drinking cherry-bark tea? The bark contains amygdalin or cyanide and cyanide kills enzymes, which results in oxygen starvation at the cellular level. What toxic plant provides the majority of human calories in the tropics? Cassava Manihot esculenta What are the three conditions that must coincide for the furocoumarin reaction? Bare skin has contact with parsnips, hogweed etc. Exposure to sunshine Moisture on skin What is the “Exchange principle”? Give one example of its application to forensic botany. A criminal always leaves something at the crime scene, or takes something away. If a criminal uses a piece of wood to kill their victim, that wood may only be found in a specific area. The criminal may also leave some leaves behind, which are also only found in a specific area. Define Dendrochronology Commonly known as tree-ring dating. Trees produce an annual growth ring. Growth rings are relatively concentric. Growth rings also have variability
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This note was uploaded on 03/30/2008 for the course PLB 105 taught by Professor Heatherhallen during the Fall '07 term at Michigan State University.

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Exam 4 - PLB 105 Heather Hallen Exam 4 Questions What is a...

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