BIOL 1130 Lecture Notes - Meiosis, Bract, Pollination
27 Sep 2013
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Embryo protected in a seed coat with a supply of food for the developing embryo. Gametophytes develop on the sporophyte and they are dependent on the sporophyte. Oldest living organism (4600 years) bristle-cone piddle california, Resin canals in 2nd growth for protection from fungi and bacterial growth as well as insect damage. Have tracheids but no vessels in the xylem tissue. Bark is present can be 5-7 cm thick in some trees. No companion cells in phloem have albuminous cells same function. Spirally arranged microscoprophylls attached to a central axis. Each has 2 microsporangia attached to its lower surface contain the microsporocytes. Each complex consists of a sterile bract & ovulate scale that was formed from the fusion of megasporophylls. Each ovulate scale 2 ovules on the upper surface. These ovules are protected by an integument which has small opening (microphyle) that leads into the ovule.
