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Unformatted text preview: • Dovekies (“Li9le Auk”) in distress oﬀ Long Island • Small birds related to auks, breed in ArcGc circle, migrate south for the winter • 11 were found on land on eastern Long Island – usually only 1‐2 per year thanks to Joseph Pennino! today’s factoid • anemic and malnourished – Feathers could no longer repel water • Wildlife Rescue Center in Hampton Bays is a9empGng to rehabilitate them ‐ very diﬃcult • May have been blown in by unusually strong storms Alle alle (only member of the genus Alle) h9p://en.wikipedia.org/wiki/File:Alle_alle1.jpg STORY POSTED IN BIOLOGY IN THE NEWS ON BB st mid term exam 1
Wed. Feb. 24th IN CLASS on material through Wed. Feb. 17th 35 mulGple choice quesGons + 3 bonus factoid quesGons Average of 2 best mid term grades out of 3 consGtute 60% of ﬁnal course grade • BRING ONLY pencils, ID • • • • • BE ON TIME – all other items cannot be brought to your seat – doors close 10 min ajer exam starts – no other excuses accepted • ONLY DOCUMENTED MEDICAL/FAMILY BEREAVEMENT EMERGENCIES ARE ACCEPTABLE EXCUSES FOR MISSING EXAM Xylem systems in ﬂowering plants consist of tracheids and vessel member cells (two diﬀerent cell types) Eventually Most gymnosperms do not have vessel member cells. Vascular plants evolved secondary cell walls with lignin From Beona Selig, Gunilla Borgefors: h9p://www.cb.uu.se/ Lignin is bright green The most abundant organic material on earth ajer cellulose (in cell walls of green plants, some algae, also present in some bacteria) what about leaves and roots? • • (note the original version of this slide was in error about the development of leaves and roots) http://www.sandakanrfp.sabah.gov.my/ pteridophytes/lycopodiella.jpg Leaves: • microphylls – simple leaves • small • present in club mosses • thought to have evolved from sporangia • megaphylls – leaves as we generally know them • may have evolved as a ﬂa9ening of branching stem with “overtopping growth” but may have evolved at diﬀerent Gmes – shoot system – above ground – root system • develops analogously to shoot system in many ways, specializes for below ground funcGons • rhizomes are stems growing underground to produce new above ground growth nearby – present in Rhynia – roots likely evolved as rhizomes ﬁrst • Ferns ‐ (Vascular Plants) – make large (“true”) leaves with extensive vascular supply Tree ferns Cycads are not ferns, they are gymnosperms Fern spore dispersal in air: very eﬀecGve for an invasive plant • Lygodium microphyllum – "Old World climbing fern" – African/Asian naGve • currently invading Florida Everglades as a rapidly spreading weed h9p://www.anbg.gov.au/fern/images/p254.jpg h9p://upload.wikimedia.org/wikipedia/commons/3/39/ ARS_Lygodium_microphyllum.jpg have you eaten ferns? • ﬁddleheads of ferns – developing leaves • in Japanese cuisine: “warabi” • h9p://blog.jagaimo.com/images/ul/ Warabinoohitashi_1FF/warabi024_thumb.jpg homospory and heterospory • homospory – ancestral condiGon – single type of gametophyte produces both male and female spores • heterospory – sporophytes produce spores of two diﬀerent sexes • megasporangium produces megaspores, which become female gametophytes • microsporangium produces microspores, which become male gametophytes – sets the stage for sexual dimorphism of seed plants (2N) (N) (2N) (2N) (N) REVIEW TIMELINE Moss Moss Fern Cones = 1 example ...
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This note was uploaded on 02/18/2010 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.
- Spring '08