Lab 6_Plants Part 1_2010_student

Lab 6_Plants Part 1_2010_student - Lab Topic 7 Nonvascular...

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Lab Topic 7: Nonvascular, and seedless vascular plants pp.123-141
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The move to land Problem on land Plant Solution Desiccation Waxy cuticle Gas Exchange Stomata Transport of materials within body Bryophytes have thin bodies, other groups use vascular tissue Reproduction is water-dependent (sperm need water to swim to egg) Early plants are confined to wet/moist environments. Seeded plants use pollen Protection of vulnerable embryos Embryos are retained in female gametophyte in seedless plants, later plants develop protective seed coats Reaching essential resources (light, CO2, water, minerals) Apical meristems (localized regions of growth) allow for increased exposure to Aquatic Chara
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Evolution & Diversity of land plants: 1. Earliest plants: Seedless, nonvascular 2. vascular tissue (xylem and phloem) 3. Seeds Today’s lab focuses on these 2 groups
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Alternation of Generations The plant life cycle alternates between gametophyte generation (everything that is 1n shown in blue) and sporophyte generation (everything that is 2n shown in red) Embryo (2n) Sporophyte(2n) Sporangia (2n) (special jacket where spores are produced) Spores (1n)
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