Plant Diversity II: The Evolution of Seed Plants - PowerPoint PPT Presentation

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Plant Diversity II: The Evolution of Seed Plants

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Title: The Evolution of Seed Plants Author: BlugeD Last modified by: BlugeD Created Date: 1/15/2003 2:36:12 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: Plant Diversity II: The Evolution of Seed Plants


1
Plant Diversity IIThe Evolution of Seed Plants
  • Overview of Reproductive Adaptations
  • Gymnosperms
  • Angiosperms

2
Reproductive Adaptations of Seed Plants
  • Reduced gametophyte-retained within the
    sporophyte
  • Origin of the seed-protected embryo and key
    dispersal structure
  • Pollen-no longer a need for external water for
    fertilization

3
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4
Gymnosperms
  • Evolved during Mesozoic era
  • naked seed
  • Conifers are largest division
  • Characterized by
  • 1. Thick cuticle
  • 2. Recessed stomata
  • 3. Long, thin leaves (needles)

5
Figure 30.9 The life cycle of a pine (Layer 1)
6
Figure 30.9 The life cycle of a pine (Layer 2)
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8
Role of Cones
  • Two types
  • 1. Pollinate cone-male, pollen producting,
  • contains microgametophyte, seasonal
  • 2. Ovulate cone-female, contains
  • megagametophyte

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10
Angiosperms
  • Flowering plants
  • Monocots and dicots
  • Many dependent upon insects for pollen dispersal
  • Flower-key reproductive adaptation, many
    variations
  • Importance of fruit

11
Flower
  • Evolved from modified leaves
  • Four evolutionary trends
  • 1. Number of parts have become reduced
  • 2. Parts fused
  • 3. Radial?bilateral symmetry
  • 4. Position of ovary changed

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13
Pollen Grains
14
Seed and Fruit
  • The seed contains
  • Embryo
  • Cotyledon(s)
  • Seed coat
  • Function
  • Dispersal
  • Protection
  • Dormancy?
  • Functions of the fruit
  • Protection?
  • Dispersal?

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Videos and Websites
  • http//www.youtube.com/watch?v35vPjdTNRU0
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