BIO_SC 1200 Lecture Notes - Lecture 1: Conifer Cone, Sporophyte, Sporangium
15 Jan 2015
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Gymnosperms: have vascular tissue and produce seeds. Have cones instead of flowers: some have leaves called needles, have roots, dominant sporophyte (diploid) stage, don"t need to be near water. Don"t need it to reproduce: life cycle. Sporophyte: has male pollen cone, has female seed cones, both have scales. These are the sporangium: cells in scales undergo meiosis to produce the gametophyte, sperm find their way into the seed cone. Two sperm fertilize two eggs: both zygotes have ability to grow to sporophytes. Makes the seed which can grow into a new plant: types. Pines: evergreens with needles for leaves, modified leaves, have sunken stomata, which better control water loss, slightly different vascular tissues. Were sponsored by ginkgo sellers, though: french group found positive effect with memory on young women. Sample size of 12, though: national institute of health found no correlation , increases risk of internal bleeding. Cycads: look similar to ferns, but have cones.
