Plant Unit

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Plant Unit

• Plant Diversity 1 The Colonization of Land

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The Colonization of Land

• An Overview of Plant Evolution
• Structural, chemical, and reproductive
  adaptations enabled plants to colonize land
• The history of terrestrial adaptation is the key
  to modern plant diversity
• The Origin of Plants
• Plants probably evolved from green algae called
  charophytes
• Alternation of generations in plants may have
  originated by delayed meiosis
• Adaptations to shallow water preadapted plants
  for living on land

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The Colonization of Land

• Bryophytes
• The embryophyte adaptation evolved into
  bryophytes
• The gametophyte is the dominant generation I the
  life cycle of bryophytes
• The three divisions of bryophytes are mosses,
  liverworts, and hornworts
• The Origin of Vascular Plants
• Additional terrestrial adaptations evolved as
  vascular plants descended from bryophyte-like
  anscestors
• The branched sporophytes of vascular plants
  amplified the production of spores and made
  complex bodies possible
• Seedless Vascular Plants
• A sporophyte-dominant life-cycle evolved in
  seedless vascular plants
• The three divisions of seedless vascular plants
  are lycophytes, horsetails, and ferns
• Seedless vascular plants formed vast coal
  forests during the carboniferous period

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Chara
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Coleochaete
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Charophyceans
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Apical Meristems
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Marchantia Embryo
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Embryos of Land Plants
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Alternation of Generation
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Fern Spore
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Hornwort Sporangium
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Archegonium
Antheridium
Gametangia
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Cuticle
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Polypodium Stem
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Phloem and Xylem
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Fossil Spores and Tissue
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Plant Alternation of Generation Hypothesis
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Bryophyte collage Thalloid Liverwort, Leafy
Liverwort, Hornwort and Moss
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Quillwort
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Polytrichum Life- Cycle
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Gametophytes
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Archegonium
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Sporophytes
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Sporangium
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Spores
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Protonemata
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Moss Life Cycle
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Sporophyte Section
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Moss Sporangium
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Peat Moss Bog
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Sphagnum Moss
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Sphagnum Leaf
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Pteridophytes Club Moss, Whisk Fern, Horsetail,
Polypodium Fern
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Lycophyte
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Leaf Evolution Hypothesis
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Fern Life Cycle
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Mature Fern
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Sorus
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Sporgangium
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Mature Sporangium
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Germinating Spore
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Gametophyte
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Archegonia
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Sporophytes
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Polypodium Fern
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Polypodium Sori
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Polypodium Sorus
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Carboniferous (replica)
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The Colonization of Land

• An Overview of Plant Evolution
• Structural, chemical, and reproductive
  adaptations enabled plants to colonize land
• The history of terrestrial adaptation is the key
  to modern plant diversity
• The Origin of Plants
• Plants probably evolved from green algae called
  charophytes
• Alternation of generations in plants may have
  originated by delayed meiosis
• Adaptations to shallow water preadapted plants
  for living on land

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The Colonization of Land

• Bryophytes
• The embryophyte adaptation evolved into
  bryophytes
• The gametophyte is the dominant generation I the
  life cycle of bryophytes
• The three divisions of bryophytes are mosses,
  liverworts, and hornworts
• The Origin of Vascular Plants
• Additional terrestrial adaptations evolved as
  vascular plants descended from bryophyte-like
  anscestors
• The branched sporophytes of vascular plants
  amplified the production of spores and made
  complex bodies possible
• Seedless Vascular Plants
• A sporophyte-dominant life-cycle evolved in
  seedless vascular plants
• The three divisions of seedless vascular plants
  are lycophytes, horsetails, and ferns
• Seedless vascular plants formed vast coal
  forests during the carboniferous period