The Plant Kingdom I

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The Plant Kingdom I

• BIOL 100
• 8 December 2009

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Plantae Table 22.1 p. 453

• Divided into 10 divisions ( phyla)
• This class 8 major phyla

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Fig 22.3 p. 455
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The Plant Life CycleAlternation of Generations

• Found in all plant taxa
• Gametophyte 1N plant with gametangia
• Site of mitotic production of 1N sperm and eggs
• These undergo fertilization to produce
• Sporophyte 2N plant with sporangia
• Site of meiosis, making 1N spores
• These undergo mitotic growth to become 1N
  gametophytes

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Fig 22.5 p. 457

• Phylum Bryophyta
• 24,000 species of mosses, liverworts, and
  hornworts
• All very small
• No vascular tissues
• 1N gametophyte is larger stage

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Fig 22.6 p. 458

• Vascular Tissues
• In 9 of 10 divisions
• Sporophyte is larger stage (by far) in all
  vascular plants
• Xylem transports water and soil nutrients
• Latin for wood
• Phloem transports sucrose, in sap

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Fig 22.7 p. 459

• Phylum Pteridophyta
• 13,000 species of ferns
• Typically with fronds
• Sori (sing. sorus) are clusters of sporangia

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Fig 22.8 p. 460

• Phylum Lycopodophyta
• 1100 species of club mosses (aka princess pines,
  ground cedars, etc.) spike mosses and
  quillworts
• Strobilus is series of leaves holding sporangia

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Fig 22.9 p. 460

• Phylum Equisetophyta
• 15 species of horsetails
• Silicon ribs
• Tiny leaf whorls
• Strobilus on tip of unbranching stem houses
  sporangia

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Horsetail Strobilus