Nonvascular Plants

Nonvascular Plants - o vascular xylem/phloem transport...

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Nonvascular Plants plants  - eukaryotic, multicellular, autotrophic  alternation of generations (heteromorphic) - haploid >> diploid (haplodiplontic) o humans have diplontic life cycles (only diploid form = multicellular) o sporophyte - diploid, creates spores through meiosis o gametophytes - haploid, creates gametes through mitosis adapted to terrestrial environment - cuticle (waxy covering), cork layers, bark prevent drying out gas exchange controlled by guard cells, stomata structural support - no more water to hold up the plant o lignin - stiffening substance >> plant stays vertical o guarantees maximum surface area for sunlight absorption phloem/xylem transport system evolves to replace intracellular transport 2 major plant groups - nonvascular, vascular o nonvascular - 3/12 phyla, no tissue for water/nutrient transport
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Unformatted text preview: o vascular - xylem/phloem transport system nonvascular plants - “bryophytes,” transition between aquatic algae and land plants • less than 7cm tall • no conducting vessels • lack true roots, stems, leaves • needs water for reproduction • Bryophyta- moss o anchored by rhizoid o 1-cell thick o gametophyte - small, leaf-like; archegonia (egg) and antheridia (sperm) • Hepaticophyta- leafy/thallose liverworts o grows prostrate (horizontal to ground) o gametangia - umbrella structure for sexual reproduction o gemmae for asexual reproduction • Anthrocerophyta- hornworts o sporophyte at top, attached to gametophyte o sporophyte continues to grow, not just for reproduction...
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Nonvascular Plants - o vascular xylem/phloem transport...

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