1 / 11

Conifers

2 kinds of cones. Conifers. Male vs. Female Cones. Male Pollen cones. Female Seed cones immature. Male. Female immature. Mature Immature. “ Naked” and “Covered”. Reproduction. Scales Male cones produce male gametophytes called pollen grain

byron
Download Presentation

Conifers

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 2 kinds of cones Conifers

  2. Male vs. Female Cones Male Pollen cones Female Seed cones immature

  3. Male Female immature

  4. Mature Immature

  5. “Naked” and “Covered”

  6. Reproduction • Scales • Male cones produce male gametophytes called pollen grain • Female cones (seed cone) produce female gametophytes called ovules(eggs) • Embryo – same idea as zygote (egg+sperm)

  7. Conifer Reproduction In this example we are using a pine cone seed coat Egg (n) Female gametophyte (n) Unfertilized ovule

  8. Unfertilized ovule

  9. Conifer Reproduction Fertilization initiates the transformation of the ovule into a seed Female gametophyte (n) Discharged sperm nucleus (n) Micropyle Male gametophyte (pollen grain) (n)

  10. Conifer Reproduction Compared to a single-celled spore, a seed is much more resistant and complex Seed coat Food supply Embryo (2n) Inside the seed (new sporophyte)

  11. Rise to the Angiosperms Seed plants appeared ~360 mya with the rise of the Gymnosperms Flowering plants (Angiosperms) – the other surviving lineage – appeared ~200 million years later

More Related