BIOC61H3 Lecture 6: Lecture 6

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orangeherring876

12 Feb 2011

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We finished discussing the importance of chemical factors in determining herbivory from taking effect. All organisms die and decompose (pig example) and the importance of community ecology that occurs when things decompose. There are chemical factors that prevent the rapid decay as well as preventing organisms being feasted upon while they are still alive. If there are pharmacological affects that will affect the feasting animal then they won"t eat it i. e. caffeine, nicotine, and morphine will have quite sophisticated affects on the cns. They are all addictive as well as you know. There are 1,000s of chemicals that are routinely produced by plants. Microbes, fungi, algae, and animals also produce chemicals to prevent feasting by predatory organisms on them. The most sophisticated arsenals are made by plants probably because they can"t run away from anything. Saplings have to have some defence or they will be eaten completely.

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amaranthimpala915

1.The shikimic acid pathway is critical for producing aromatic amino acids in plants. Why is this important for animals?

a) They provide a sweet flavor for fruits and vegetables.

b) They are the source of essential amino acids (such as tryptophan); animals cannot synthesize these amino acids

c) They are used as the primary immune response in plants and convey passive immunity to animals

d) All of these are correct

2. Alkaloids are common in plants, and significant resources are devoted to their production. What benefit can they be to plants?

a) They are bitter, decreasing herbivory across taxa

b) Many are significantly toxic to animals

c) Some alkaloids have antibotic properties

d) They may havae significant pharmacological benefits

e) Two of these are correct

f) Three of these are correct

g) All of these are correct

BIOC61H3 Lecture 6: Lecture 6

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