Biolog 23 - Chapter 23: Plant Evolution I. Evolution A....

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Chapter 23: Plant Evolution I. Evolution A. Charophytes is a group that has 200 known species today B. Rhyniophytes are the first seedless vascular plants C. Plants came from lowland swamps into diverse habitats II. Trends A. Xylem and phloem are vascular tissues that distribute water and nutrients respectively B. Gametophyte is a haploid multi-celled body in which gametes form C. Sporophyte is what forms when male and female gametes fuse at fertilization and form a zygote D. Spores are haploid reproductive cells that aren’t gametes and do not take part in fertilization E. Pollen grains have sturdy wall around a few cells that develop into a mature male sporophyte III. Bryophytes A. First plants that were small and lived in moist habitats B. Rhizoids absorb water and nutrients and anchor gametophytes to substrates C. Flagellated sperm reach non-motile eggs by swimming through water D. Sporophyte grows from gametophyte tissues IV. Seedless Vascular Plants A. Lycophytes, horsetails, and ferns
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Biolog 23 - Chapter 23: Plant Evolution I. Evolution A....

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