Evolution of Plants Plant Evolution All Plants have

Evolution of Plants Plant Evolution All Plants have

Evolution of Plants Plant Evolution All Plants have Alternation of Generations gametophyte.

plant body that produces gametes Sporophyte plant body makes spores Spore =

reproductive structure protected by hard wall. Used for dispersal. germinates by breaking out of wall. Spores (1n) germinate and grow into

gametophytes (1n) Gametes fuse and grow into sporophytes(2n) Sporophytes 2n.make spores (1n) by meiosis Gametophytes 1n make gametes by

mitosis Charophytes: Link btwn plants & algae Charophytes no alternation of generation so not plant Produce cellulose cells walls in same

unique fashion, Chloroplast DNA similar Only non-plant with anti-photorespiration enzymes True plants with alternation of generations (evolved 50 mya)

Primitive plants have: a) swimming sperm b) gametophyte dominant c) sporophyte supported by gametophyte d) no veins e) no seeds

Ordovician : Ozone allows first land plants shared derived trait: waxy cuticle Advantages to life on land More direct sunlight

Higher CO2 concentration Soil nutrients No herbivores Challenges to Life on Land

Desiccation Lack of support vs gravity Silurian : 1st vascular plants = have veins to transport H2O & sugars

Rhyniophytes Seedless, only stems but no roots or leaves Devoinan: Seedless vascular

plants : Lycophytes, horsetails & ferns New trait: upright growth due to lignin in cell walls First dominant sporophyte But still primitive with swimming sperm

& no seeds Underwent adaptive radiation took over Devonian swamps Lycophytes :club moss or ground pines

Horse tails: scouring rushes Ferns These are sporophytes sori full of spores

Gametophytes microscopic Carboniferous Period: coal deposits form Seedless vascular plants as tall as trees sea level dry out and flood swamps

Layers of dead plants build up faster than they decompose Carboniferous = first conifers

Conifers = seed plants with cones Gymnosperms = naked seeds Ovules fertilized by sperm nuclei carried in pollen Pollen = freedom from water, it is carried by wind so can disperse on land

Advantage of Seeds Multicellular vs spores unicellular Have stored energy

(starch/oil) 1) allows delayed germination

2)enhanced early growth Protective coating over embryo May have Fruit or dispersal aids

Angiosperms = flowering plants Seed plants with flowers Seeds form in Ovary of flower Ovary may form fruit Most modern group now 90% of all

plant species Reproductive adaptation to pollinators All but bryophytes Dominant sporophyte (2n)

grows from embryo Small gametophyte (1n)

Recently Viewed Presentations

  • To Kill a Mockingbird - Mr. Jason Spitzer, English Language Arts

    To Kill a Mockingbird - Mr. Jason Spitzer, English Language Arts

    Steinbeck's title was inspired by an eighteenth century poem called "To a Mouse [on turning her up in her nest with the plough]" by Scottish poet Robert Burns. In the poem, a man incidentally ploughs over a mouse's den while...
  • BIM Ex Plan Research Integration Model Codes Looking

    BIM Ex Plan Research Integration Model Codes Looking

    Use BIM as a tool to improve our building design & construction process- Achieve LEED Certification for the building - Understand the effects of discipline specific decisions on the broader project team. Model. Bim Ex Plan. Integration. Codes. Looking Forward....
  • Distribution of Power

    Distribution of Power

    Explain how most countries have a mixed economy located on a continuum between pure market and pure command. c. Compare and contrast the basic types of economic systems found in Canada, Cuba, and Brazil. What is Economics? Economics is the...
  • Name Grade School Floral Teacher - Texas State Florists ...

    Name Grade School Floral Teacher - Texas State Florists ...

    Dozen carnations or roses in a vase designed in 20 minutes or less. Make a bow and dress a plant with that bow. #9 or #40 Ribbon recommended. Stylized Permanent Silk Botanical Arrangement. Similar to the examples on the TSFA...
  • Other facets of invertebrate embryology

    Other facets of invertebrate embryology

    Other facets of invertebrate embryology ... in blastocoel Schizocoely--split in the mesoderm to form the coelom Deuterostomates Budding off of the archenteron enterocoely Outcomes in the pattern of development Protostomates, have spiral cleavage Determinate--cell futures are predictable ...
  • mining an unexpected source of innovation: lessons from

    mining an unexpected source of innovation: lessons from

    Where the brand name isn't what's important—it's the functionality and features of the device itself. And I'll talk more about this in a bit. * Shanzhai manufacturing has also come to include the idea of indigenous innovation. So this is...
  • Windows Server 2012 Overview - ITProGuru Blog

    Windows Server 2012 Overview - ITProGuru Blog

    Start developing your "Personal Mission Statement". Follow it every day. Find Community Groups in your area… Visit many of them and volunteer for the one(s) that interest you. Bing.com: ... Samsung 900x / Dell Precision M4600. Execute Disable * Hardware...
  • Perceptual Development I. Introduction A. What is the

    Perceptual Development I. Introduction A. What is the

    Perceptual Development Introduction What is the infant's phenomenological world like? How can we answer this question? Infant methodologies Localization techniques