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AEBI 210- Nov 14th.doc

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Biology (Agric & Envir Sc)
AEBI 210
Jaswinder Singh

Organisms 1- AEBI-210 001 November 14th, 2012 Seedless Vascular Plants Evolution of Land Plants: Charophytes (algae) Bryophytes (moss) -No vascular tissue -Sporophyte depends entirely on the large gametophyte -Sporophyte is unbranched and has only one sporangium Seedless vascular plants (ferns, horsetails) -Lignified vascular tissue -Tiny gametophyte, large sporophyte that becomes independent from the gametophyte -Sporophyte is branched and may have many sporangia Gymnosperms (conifers, first seed plants) -Eusporangiate- sporangia are multicellular and produce many spores Angiosperms (flowering plants) Seedless Vascular Plants: Sporophyll is a leaf that bears the sporangia Homosporous sporophytes produce spores that germinate into bisexual gametophytes -Gametophyte has an antheridia and archegonia Heterosporous sporophytes produce spores which germinate into m or f gametophytes -Male gameto- phytes have an an- theridia and female gametophytes have an archegonia Lifecycle: -Tiny independent gametophytes make gametes -Gametes are fer- tilized and at- tached to the fe- male plant -The zygote grows Organisms 1- AEBI-210 001 into a mature independent sporophyte (visible plant) -Meiosis occurs in the sporocytes in the sporophyte’s sporangia -Haploid spores are release and grow into gametophytes Lycopodiophyta: Dominated in the Carboniferous, and could be very tall Lycopodiaceae are homosporous -Have spirally arranged microphylls -Sporangia are in sporophylls arranged in strobilus (cone) -Spores develop in the sporangia in the strobilus -Spores g
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