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Chapter_44_to_post - Chapter 44 Plant Reproduction and...

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Unformatted text preview: Chapter 44 Plant Reproduction and Development Organ systems of flowering plants Asexual reproduction Asexual reproduction by fragmentation, either naturally (runners) or artificial (clippings) Evolution of flowers Evolution of flowers Gymnosperms (earliest seed plants) Evolution of flowers gymnosperms wind pollination used for fertilization Advantage - dont need any biological help Disadvantage - its an inefficient process Male pine cones Evolution of flowers gymnosperms wind pollination insects started carrying pollen grains from male to female plants ~150 million years ago Plants enticed insects with food in the form of pollen (protein rich) and female cones (sugar rich) Evolution of flowers gymnosperms wind pollination insects Angiosperms: flowering plants, developed ~130 million years ago. Flowers attract pollinators . Sexual reproduction: -combines genes from 2 different parents, offspring genetically different Flower structure : parts evolved from leaves Flower structure complete flowers have 4 parts Flower structure complete flowers 1. Sepals: sometimes colored, attractors Flower structure complete flowers 1. sepals 2. Petals: colored, patterned to attract Flower structure complete flowers 1. sepals 2. petals 3. Stamens: male reproductive parts, composed of filament and anther Flower structure complete flowers 1. sepals 2. petals 3. stamens 4. Carpels: female reproductive parts, composed of stigma, style and ovary Flower structure complete flowers 1. sepals 2. petals 3. stamens 4. carpels wind-pollinated flowers: inconspicuous and unscented, produce LOTS of pollen (hit-or-miss strategy) Coevolution of flowers and pollinators Coevolution of flowers and pollinators wind-pollinated flowers animal-pollinated flowers Coevolution of flowers and pollinators wind-pollinated flowers animal-pollinated flowers 1. attract pollinators using colors and scents What bees see and humans see is sometimes very different...
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Chapter_44_to_post - Chapter 44 Plant Reproduction and...

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