BioII_notes_(april_12)

BioII_notes_(april_12) - April 12, 2010 Land plants: ferns,...

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April 12, 2010 Land plants : ferns, gymnosperms, angiosperms o Ferns are untouched by animals. Insects do not feed on them. Insects have a hormone (juvenile hormone) that keeps them from becoming an adult (when it goes down they become adults). Ferns produce juvenile or anti juvenile hormones (95% or so) Juvenile hormones keep them from becoming adults. Anti juveniles turns them into adults to soon and messes them up. o Gymnosperms (pines) Some have the hormones too but they mostly have sacks to protect them. Also have alternation of generations but are different from that of angiosperms. o Angiosperms Anthers: Spermophyte generation. Produces haploid pollen grains. Carpel (female part) consists of the stigma, style and ovary. Ovary produces the eggs. Petals: colorful Sepals: green that covers the flower and petals.
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This note was uploaded on 01/26/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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BioII_notes_(april_12) - April 12, 2010 Land plants: ferns,...

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