b112_Lecture_30

b112_Lecture_30 - 2/19/2008 TheUniquenessofSeeds

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2/19/2008 1 BIOL 112–Chapter 30 The Seed Plants The Uniqueness of Seeds Seed contains the embryo (derived from female gametophyte) and is for dispersal. Pollen contains the male gametophyte. Gametophytes in seed plants are never free living. Gymnosperms Gymnosperm = naked seed Lack ovaries in which seeds can develop 4 divisions: Cycadophyta Ginkgophyta Gnetophyta Coniferophyta
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2/19/2008 2 Cycas revoluta Cycas rumphii Zamia fischeri Pollen Cones Zamia inermis seed cone Ginkgo biloba Ephedra aspera Ephedra trifurca male cones Ephedra trifurca female cones Welwitschia mirabilis
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2/19/2008 3 Welwitschia mirabilis Female Cones Male Cones Division Anthophyta Most diverse and geographically widespread of all plants. 2 Classes: Magnoliopsida – Dicotyledons (Dicots) Liliopsida – Monocotyledons (Monocots) More refined vascular system with vessel elements (instead of tracheids) and fiber cells.
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b112_Lecture_30 - 2/19/2008 TheUniquenessofSeeds

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