1.
Summarize the events that occur during the HR and SAR. In what way are these responses different? How are they complementary?
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2.
Why is it significant that R loci are usually clustered on the same chromosome? Why is it important that R loci are usually highly polymorphic?
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3.
What evidence suggested that a hormone travels from the site of insect damage to undamaged tissues? How did investigators discover systemin and confirm that it is the wound-response hormone?
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4.
Many of the fragrant molecules given off by plants to attract pollinators are secondary metabolites. Suggest a scenario for the evolution of these attractant compounds, analogous to the presentation in the text regarding the evolution of defense compounds.
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5.
Describe some of the similarities and differences in plant defenses against pathogens and herbivores.
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6.
The HR has been called "an efficient suicide program." Why?
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