Plant Diversity II

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Chapter 30

• Plant Diversity II

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Evolution of Seed Plants
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Evolution of Seeds

• Means to disperse offspring
• Seed consists of a sporophyte embryo, a food
  supply with a protective coating.
• Megasporangia female egg containing
• Microsporangia male pollen producers
• Pollen may be air borne or dispersed by animals /
  insects

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GymnospermsNaked Seeds
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Phylum Ginkgophyta

• Ginko biloba

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Phylum Cycadophyta

• Cycads

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Phylum Coniferophyta

• Most are evergreens
• Pines, firs, spruces, yews, junipers, cedars,
  cypress, and red woods.
• 550 species
• Conifer means cone
• Needle shaped leaves

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Seeds and Pollen
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Pacific Yew Tree
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Cypress
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Pine Farm
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Phylum AnthophytaFlowering Plants

• Monocots and dicots
• Use flowers to refine reproductive strategy
• Reproduce very quickly
• Very successful land plants
• Use fruits to hold and disperse the mature ovum
• Used refinements in xylem to grow larger and to
  spread more quickly.

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Pea Flower and Fruit
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