Gymnosperms

• What are the advantages to having a seeds?


  Can remain dormant for long periods of time
• What are the advantages to having a seeds?

  Seeds can aid in the dispersal of long distance
• When did seed plants evolve?

  350 million years ago
• DO gymnosperms have naked seeds?

  Yes
• What causes the easten spruce gall? (pinophyta)

  Adelges abietes
• What causes the eastern spruce gall? (pinophyta)

  Adelges abietes

  
• What is the classification of the Norway Spruce? (pinophyta)

  Picea abies

  
• What is the classification of the easten hemlock? (pinophyta)

  Tsuga canadensis

  
• What is the classification of the bald cypress? (pinophyta)

  Taxodium distichum
• What is the classification of the American larch? (pinophyta)

  Larix laricina

  
• What is the classification of the bald cypress? (pinophyta)

  Taxodium distichum

  
• What is the classification of the dawn redwood? (pinophyta)

  Metasequoia glyptostroboides

  
• What is the classification of the giant redwood? (pinophyta)

  Sequoia sempervirens

  
• What is the classification of the Canada yew? (pinophyta)

  Taxus canadensis

  
• Is the Wollemi pine a living fossil?

  Yes
• What are cycads in? (pinophyta)

  Cycadophyta, they have motile sperm
• What are gingkos in? (pinophyta)

  Gingkophyta, have motile sperm and a fleshy seed covering

  
• What is the classification of ephedra? (pinophyta)

  Ephedra antisyphilitica

  
• What is the classification of gnetum?

  Gnetum sp.
• What is the classification of Welwitschia?

  Welwitschia spp.

  
• Do gymnosperms have heterospory?

  YEs
• What happens to the female cone in gymnosperms?

  Megasporocyte undergoes meiosis to produce 4 megaspores. 3 degenerate and one becomes the female gametophtye
• What happens to the male gametophyte in gymnosperms?

  Reduced to 4 cells, no antheridia