Lab8_plant_pterophytya_Lycophyta

Lab8_plant_pterophytya_Lycophyta - Green Plants Plants are...

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1 Green Plants • Plants are autotrophic, contain chlorophyll a, and have cell walls containing cellulose. • Distinguish groups of plants by morphology , life cycle , and the presence or absence of vascular tissues - 12 most important phyla Nonvascular plants: • Bryophytes (mosses, liverworts, hornworts) – Exercise 28 Seedless vascular plants (have well-developed vascular tissue but do not make seeds) : • Ferns and fern allies – Exercise 29 Seed plants (have vascular tissue and make seeds) : • Gymnosperms – Exercise 30 • Angiosperms – Exercise 31 Molecular Phylogenies of Plants
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2 • All land plants undergo alternation of generations . – A multicellular haploid phase called the gametophyte. – A multicellular diploid phase known as the sporophyte . • The relationship between gametophyte and sporophyte is variable. Exercise 28 Bryophytes: Nonvascular plants • Bryophytes include liverworts, mosses, and hornworts. • Lack vascular tissue – specialized groups of cells that conduct water or dissolved nutrients from one part of plant body to another.
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3 Nonvascular plants • ~ 24,000 species •F ix CO 2 , degrade rock to soil, stabilize soil and reduce erosion. • Lack of vascular tissues limits bryophytes to moist habitats. – Rhizoids neither penetrate the soil very far nor absorb nutrients. – Small size • Used as fuel, in production of Scotch whiskey, packing
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Lab8_plant_pterophytya_Lycophyta - Green Plants Plants are...

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