01:119:116 Lecture Notes - Lecture 7: Sorus, Marchantiophyta, Phloem
7 Mar 2016
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Document Summary
Formation of phragmoplast (groups of microtubules between daughter nuclei) Grow into multicell gametophyte by mitosis: multicell. Gametangia: gametangia - multicell gamete-producing organs, archegonia - produce eggs ii. 1: protections from microbes, stomata, tiny openings on surface that open/close, allows gas exchange & water evap. 2. lack specialized vascular systems form a grade - grp of orgs sharing key feature: vascular plants, seedless, lycophytes - club mosses, monilophytes - ferns, seeded, gymnosperm - naked seed eg. conifers, angiosperm - flowering plants. Byrophytes: 23 phyla - small, non woody, phylum hepatophyta - liverworts, phylum anthocerophyta - hornworts, phylum byrophyta - mosses, early divergence. 29. 5: non vascular, no specialized transport tissue, rely on diffusion, osmosis, require moist environment for, water, reproduction, moss life cycle. 2: importance of mosses, extremely common, can colonize bare soil help retain n in soil, peat- partially decayed organic matter. 3 (1) megasporangium: produces megaspores female gametophyte egg in archegonia (2) microsporangium: produces microspores male gametophyte sperm in antheridia.
