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Pollen
allows seed plants to disperse male gametophytes
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Ovules
allows seend plants to disperse female gametophytes
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Phylum Coniferophyta
- Conifers are mostly evergreen
- Simple pollen cones-leaflike structure bearing microsporangia producing pollen
- More complex ovule-bearing cones
- Mature pollen released to the wind
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Flowers has 4 type organs
- Sepals
- Petals
- Stamens-produce pollen
- Carpels-produce ovules
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Pedicel
tip of the flower stalk
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Perinath
petals and sepals
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Pistils
- Single and compound carpels
- Stigma-receives and recognizes pollen
- Style
- Ovary-encloses and protects ovules
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Coevolution
Process by which two or more species of organisms influence each other's evolutionary pathway
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Pollination coevolution
- Constancy or fidelity
- Attract appropriate pollinator using attractive colors, odors, shapes, sizes
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Pollination syndrome
- Some flowers specialized for particular pollinators
- Birds-odorless red flowers
- Bees-blue, purple, yellow or white flowers with sweet odor
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Seed-Dispersal Coevolution
- Influenced both plant fruit characteristics and animal seed-dispersal agent
- Plant may have juicy, sweey fruit w small seed to pass thru gut
- Plants may signal fruit ripeness with color change
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