SI FINAL REVIEW

SI FINAL REVIEW - SI FINAL REVIEW Tuesday, April 28, 2009...

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SI FINAL REVIEW Tuesday, April 28, 2009 3:03 PM 1. Plant Reproduction o Angiosperms (Flowering Plants) o Double Fertilization Egg=> zygote 2n endosperm=> 3n endosperm o Ovary => Fruit Female gametophyte turns into seed after fertilization o Female sporophyte membrane => seed coat 2. 2 germination events o Pollen hits stigma o Seed comes out of dormancy When environmental conditions are right 3. Relation to Evolution 4. Co evolution to plants and animals o What sacrifices plants make for animals so can distribute seeds o Mechanisms to prevent plant self pollination 5. 5 plant hormones o Auxin Made in shoots In shoots encourages elongation Inhibits elongation Response to gravity Gravotropism Phototropism Roots Opposite Encourages branching of the roots Receptors Different parts of different organisms have different responses because of receptor sites o Gibberellins Induce a plant to mature sexually
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Even if plant not naturally ready, can make start to produce Ex. Flower early, lengthen stem. o Cytokinin Cell division and growth o Ethylene Gas Positive Feedback Induces fruit ripening Closed box, induces ripening of other fruits. Causes more and more o Abscisic Acid (ABA) Plant dormancy Used in droughts. Conserves available resources. Allows plant to survive through period of low resource availability Leaf Drop, named for Abscission. Named incorrectly, doesn’t control this. 6. Sexual Reproduction
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This note was uploaded on 11/05/2011 for the course BIOL 101 taught by Professor Hogan during the Fall '08 term at UNC.

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SI FINAL REVIEW - SI FINAL REVIEW Tuesday, April 28, 2009...

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