gymnosperms n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Gymnosperms PowerPoint Presentation
Download Presentation
Gymnosperms

Loading in 2 Seconds...

play fullscreen
1 / 17

Gymnosperms - PowerPoint PPT Presentation


  • 359 Views
  • Uploaded on

Gymnosperms. Biology 11. KINGDOM PLANTAE. Vascular Plants Phylum Tracheophyta. Seeds. No Seeds. Seeds enclosed. Seeds ‘naked’. Ferns. Phylum Cycadophyta (cycads) Ginkgophyta (ginkgo) Gnetophyta (shrubs, vines, tuberous root)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Gymnosperms' - rosine


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
gymnosperms

Gymnosperms

Biology 11

slide2

KINGDOM PLANTAE

Vascular Plants

Phylum Tracheophyta

Seeds

No Seeds

Seeds enclosed

Seeds ‘naked’

Ferns

Phylum

Cycadophyta (cycads)

Ginkgophyta (ginkgo)

Gnetophyta (shrubs, vines, tuberous root)

Coniferophyta (cone-bearing tree)

seed plants
Seed Plants
  • Protective covering around embryo (seed)
  • Produce cones with seeds on cone scales
  • Seed develops on each scale of cone
  • Seed is not covered therefore naked
    • Gymnosperms: “naked seed”
    • Seeds arenot enclosed by a fruit (ovary)
slide4

Reproduction occurs without water

  • Improved conducting tissue: thicker and stronger xylem. Became taller
  • Large, branching root system
adaptations for life on land
Adaptations for life on land
  • Gametophytes are reduced in size, often staying within the parent sporophyte
  • Swimming sperm are replaced with pollen which is dispersed by wind and insects
  • Produce seeds
slide6

Seed Plants

Vascular

cycadophyta the cycads
Cycadophyta- The cycads
  • Resemble palm trees but are cone bearing
  • Have fleshy stems and leathery, featherlike leaves
  • Motile sperm that swim to egg in ovule
ginkgophyta the ginkgos
Ginkgophyta- The Ginkgos
  • Primitive tree
  • Dioecious: has separate male and female trees
  • Leaves are fan shaped and thick with leathery veins
  • Have motile sperm that swim to the egg in the ovule
gnetophyta the gnetophytes
Gnetophyta- the gnetophytes
  • Can be found as shrubs, vines, or massive squat stems
  • Have sperm with no flagella
    • Pollen is transported to ovule (egg) by insects or wind
coniferophyta the conifers
Coniferophyta- the conifers
  • Conifers – cone bearers (separate male and female cones)
  • Many are evergreen and keep their leaves in the winter
  • Can grow very large and to old ages
slide12

Are adapted to severe climates and conserving water with leaves, called needles, that are covered with waxy cuticles and are long, sharp, and tend to be flat

  • Have sperm withno flagella
    • Pollen is transported to ovule (egg) by insects or wind
reproduction
Reproduction
  • There are 2 types of cones:
    • Male cone (Pollen cone)
      • Produces pollen grains (male gametophyte)
    • Female cone (Seed cone)
      • Have female gametophyte that produces ovules (eggs)
slide14

Some species of conifers have male and female cones on the same tree, others have separate trees with male and female cones

slide15

A female cone lives and grows for several years, becoming much larger than a male cone.

  • An ovule develops on each scale of a female cone. 
    • Inside the ovule, an egg cell is produced. 
  • Male cones produce pollen (male gametophyte)

MALE CONES (with pollen)

FEMALE CONE

With ovules

slide16

If fertilization occurs, an embryo grows inside the ovule.  The ovule hardens, becoming a seed.

  • Eventually the scales spread, allowing the seeds to fall. 
  • If conditions are favourable where it falls, the embryo inside the pine seed will grow into a new tree.
  • Growing

Sporophyte called

A seedling

reproductive cycle
Reproductive Cycle
  • Alternation of generations