Chapter 30 - Chapter 30 Plant Diversity I. Plant Evolution...

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Chapter 30 Plant Diversity I. Plant Evolution A. It’s believed that all arose from a single ancestral species B. Some type of green algae, 470 mya C. Adaptations to life on land 1. Waxy cuticle – prevents dessication 2. Stomata - for gas exchange 3. Structural support 4. protected embryo (seed) I I. Plant Groups Land plants are divided into two major groups A. More primitive Require moisture for reproduction B. Vascular plants have specialized tissues for these purposes Vascular tissue supports the plant Roots, rhizomes for water and mineral absorption I I I. Plant Life Cycles 1. Haplodiplontic – multicellular haploid and diploid stages
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Alternation of Generations a. halpoid generation = gametophyte (gametes) b. diploid stage = sporophyte (spores) 3. Process a. diploid sporophyte produces haploid spores (meiosis) b. spores divide (mitosis) forming haploid gametophyte c. gametophyte produces haploid gametes(male or female) d. gametes fuse forming diploid (zygote) sporophyte 4. Structures a. sporangia produce spores b. gametangia produce gametes IV. Non Vascular Plants 1. Phylum Bryophyta – mosses a. gametophyte = the dominant stage, the green part of moss is
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Chapter 30 - Chapter 30 Plant Diversity I. Plant Evolution...

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