BY 108 Chapter Notes - Chapter 28: Non-Vascular Plant, Rhizoid, Lignin
Document Summary
Alternation of generations (heteromorphic) - haploid >> diploid (haplodiplontic) Humans have diplontic life cycles (only diploid form = multicellular) Sporophyte - diploid, creates spores through meiosis. 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 lignin - stiffening substance >> plant stays vertical. Guarantees maximum surface area for sunlight absorption. Phloem/xylem transport system evolves to replace intracellular transport. Nonvascular - 3/12 phyla, no tissue for water/nutrient transport. Vascular - xylem/phloem transport system nonvascular plants - bryophytes, transition between aquatic algae and land plants. Advertising inread invented by teads less than 7cm tall. No conducting vessels lack true roots, stems, leaves. Gametophyte - small, leaf-like; archegonia (egg) and antheridia (sperm) Hepaticophyta - leafy/thallose liverworts inread invented by teads. Gametangia - umbrella structure for sexual reproduction.
