01:119:116 Lecture Notes - Lecture 10: Cork Cambium, Primary Cell, Coleoptile
28 Feb 2017
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Lecture 10 - plant anatomy: plant organization, two systems. Systems are comprised of cells, tissues, organs, systems: plant systems are composed of three organs, roots. Absorbs water (root hairs are where water enters, 1 cell thick and permeable to allow osmosis to take place) Water absorption at root hairs: ground tissue system. Short distance (cell to cell) transport: vascular tissue system. Water evaporates from leaves and draws water up from roots. Sun rises photosynthesis occurs stomata open transpiration. H2o sticks to other things with h-bonds. Allows unbroken water column to form and adhere to xylem walls. Translocation of sugars - moves source sink. Pressure-flow hypothesis - pressure gradient exists between source where sugar is loaded into phloem (high pressure) and sink where sugar is removed from phloem (low. Plasmodesma - provide a path connecting the cytoplasm of one cell to another. Remember - plants grow only at meristems: primary growth. Up and down from the tips: secondary growth.
