In Lab 13 (“Flowers”), we looked at Fern fronds. The large fronds are the sporophyte generation of the fern, and underneath the fronds, in a linear tribal-face-paint-like pattern that would make any burning man participant jealous, are the sori. Each sorus is a group of immature sporangia that will eventually undergo meiosis and give rise to the gametophyte generation. Under the dissecting scope, the sori are clearly seen to be masses of sporangium, covered by a transparent indusium. We also looked at a variety of flowers. We identified the different parts of a flower and different forms a flower can take. Flowers can be classified as perfect (possessing both male and female sex organs) or imperfect (possessing either male or female sex organs), and complete (possessing all parts of a flower) or incomplete (missing a few parts) As a wise woman once said (cough.. Dr. L.-P…), flowers show us that it is possible to be perfect AND incomplete (cue group “Awww”). Images below: LEFT: Helleborus flower, dicot, perfect and complete. Picture taken by Katie Pardee MIDDLE: Cross-section of carpel, superior ovary (other flower organs are attached below the ovary). Picture taken by Jena Ozenna. RIGHT: Cross-section of the Alstromeria flower, monocot, inferior ovary (other flower organs are attached above the ovary). Picture taken by Jena Ozenna. -Katie Pardee
0 Comments
Leave a Reply. |
AuthorContent is created by students participating in the Plant Structure course at Oregon State University for Winter 2017. Archives
March 2017
Categories
All
|