BIOL 1202 Lecture Notes - Lecture 4: Water Potential, Passive Transport, Osmosis
30 Oct 2017
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Document Summary
Adaptations for acquiring resources were key steps in the evolution of vascular plants. The broad category of nutrition includes all of the materials and energy needed for an organism to live and reproduce. Nutrition in all organisms involves four main steps: Required to break large molecules down to building blocks. Must acquire some through diet: transport of water and solutes by individual cells, short-distance transport of substances from cell to cell at the level of tissues and organs, long-distance transport (bulk flow) within xylem and phloem. Plants acquire all their nutrients from soil (minerals), water (hydrogen and oxygen), or air (co2) Transport in vascular plants occurs on three scales: Transport of water (by osmosis) and solutes (by diffusion or active transport) by individual cells occurs via a transmembrane route. Plasma membrane controls movement of solutes into and out of the cell. Concentration of solutes controls the movement of water osmosis. Solute potential ( s) determined by concentration of dissolved molecules.
