BIO 2137 Lecture Notes - Lecture 10: Gymnosperm, Xylem, Ginkgoales
17 Jul 2014
School
Department
Course
Professor
Document Summary
Changes in life cycle: 2 gametophytes (mega and microgametophyte, seeds start as ovule (female) Slide 7: stem cross section: bark, resin ducts, secondary phloem, bark, vascular cambium, secondary xylem, pith, development and fertilization in cone o. Medicinal uses: largest medical product in germany, used as treatment for memory loss and dementia, improved peripheral arterial disease (pain while walking) Gnetophyta: repoduction by cones but advanced wood like flowering plants. Cykadophyta: 11 genera and 140 species (all trpoical, palm like frond, no flowers, reproduction by cones, toxic roots, pockets of blue green algae in stem, produces nitrogen to help it grow. Conifer: 50 genera and 500 species, dominant in boreal forests, mediteranean climates and semi arid area, emergents in temperate and tropical forests, endemics in southern hemisphere. Slide 24: structure: epidermis, hypodermis, stoma, resin duct, endodermis, transfussion tissue, vascular bundle, xylem, phloem, life cycle*
