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Plant Diversity-1.5 - S10 Plant Diversity Land plants are...

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S10 Plant Diversity Land plants are monophyletic (aka all descend from a single common ancestor. One synapomorphy (shared derived characteristic): development from an embryo protected by tissue of the parent plant. (embryophytes) Plants first appeared on land between 400-500 million years ago. Adaptations were needed to survive in a dry environment Large plants needed a way to transport water to all parts of the plant. Land plants also needed support and methods to disperse gametes. All land plants have a life cycle with alternation of generations. o Includes multicellular diploid ( sporophyte-created spores through meisos) and multipcellular haploid ( gametophyte- make gametes my mitosis because body is haploid) individuals. 1. Vascular plants: (seven clades)- all have conducting cells called tracheids. The vascular system consists of tissue specialized for the transport of materials Xylem - conducts water and minerals from soil up to aerial parts of plant. Some cells have lignin which provides support. Phloem - conducts products of photosynthesis through the plant. o Non seeded Vasuclar plants (fern) In the seedless vascular plants, the large sporophyte is independent of the small, short-lived gametophtye.
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