BIOL 112 Lecture Notes - Lecture 1: Conifer Cone, Pollen Tube, Megaspore
Document Summary
Vascular tissue=conducting tissue that transports water and nutrients internally. Seed=embryonic plant enclosed in a protective outer covering. Chloroplast w/ photosynthetic pigments large central vacuole for water storage cell wall with cellulose. Made in special cell/tissue called sporangium via meiosis. Made in special cell/tissue called gametangium via mitosis. Depending on the species, gametophytes can be male, female, or hermaphroditic. ^some plants are gametophyte dominant (mosses), most are sporophyte dominant (fern, conifers, flowering plants) Mosses (phylum bryophyta) have the simplest life cycle: Spores (n( are made in a capsule (sporangium) and are dispersed by wind or water. Sperm (n) made in antheridia are dispersed by water to the egg (n) made in the archegonia. Zygote (2n) formed through fertilization, sporophytes (2n) grows out of gametophyte(via mitosis), Seed plants have miniaturized and segregated their sporangium. Conifers: -male (pollen) cones contain microsporangia female (ovulate) cones contain. Flowering plants: -male section of flower (stamen) contains microsporangia.
