BSC 2011 Chapter Notes - Chapter 37: Active Transport, Glyceraldehyde 3-Phosphate, Cytoplasmic Streaming
2 Oct 2016
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Transport overview: plants need co2, sunlight and h2o in the leaves. Only h2o needs to be transported to the leaves. Co2 gets in via stomata: water is most of the mass of a plant, carbon accounts for most of the mass of a dried plant. Fundamental forces: physical forces drive transport of materials in plants, movement by concentration gradient. Diffusion or facilitated diffusion for things other than water: osmosis is for water. Solutes move independently of water concentration: movement by pressure gradient. Bulk flow movement of water and solvents due to pressure gradient. 3 types of transport in vascular plants: transport of water & solutes by individual cells. Always accomplished by diffusion: short-distance transport of substances between cells at the tissue level. Always accomplished by diffusion: long-distance transport within the xylem & phloem among the entire plant. Always accomplished by bulk flow (pressure gradient) Individual cell movement: passive transport movement down a gradient.
