Biology 2601A/B Lecture Notes - Lecture 20: Boundary Layer, Root Pressure, Wind Speed

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Plants need water: for biochemical reactions, to maintain structure (turgor pressure, for photosynthesis. Due to this, less water is lost from the leaf tissues when the stomata is open. Roots: the root cap is not very permeable; therefore water will not be exchanged at the top, the root hair zone is where water and nutrients will be transported into the plant. Root hairs: root hairs enhance water uptake by their ability to penetrate water-containing capillary spaces between soil particles. Increase several fold the volume of water extracted from the soil: extend between the film grains into films of water. 2: apoplastic: around the outside of the cells, transmembrane: across cell"s membranes into different cells. Symplastic: water moves through the cell wall without any cell membranes. Aquaporins allow h o to move passively along a concentration gradient leave salt behind: the problem with saline/salty environments is that h o will evaporate and.

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