1202L8 - Ch. 36 Transport in Plants Understand how proton...

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Ch. 36 Transport in Plants Understand how proton pumps and solute co-transport are involved in moving ions and solutes across plant cell membrane Understand how solute concentration and back pressure determine water potential Understand the basic mechanism for water flow upwards, and sugar flow downwards in plants Plant Transport o Water is transported from roots to leaves, driven by __transportation_________ o Sugars are transported from leaves to roots o Selective ___permeability______ of cm, ion channels, and cotransport mechanisms important 0. Potassium channels allow K + to cross cm 1. Transport proteins in membrane allow other solutes to be actively transported Fig. 36.2 Proton Pump o ____ATP provides energy to pump H + out, creating negative membrane potential o Cations (Like K + ) flow into cell because of __potential______ o Cotransport of anions and neutral solutes back in along with H + Figure 36.7
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Water Potential Water moves across membrane from high to lower water potential P=back pressure from cell wall S=solute pressure (know equation) Figure 36.8 Figure 36.9
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Figure 36.10 Absorption of water and minerals o Root hairs increase __surface______ area for absorption o fungal __symbionts______, mycorrhizae, increase uptake rate o endodermis (surrounding the stele where the xylem is found) is selective barrier Figure 36.5 Figure 36.11 Xylem Transport o Root Pressure: 2. __active____ transport increases minerals in roots at nite, generate negative pressure, drawing water in 3. Guttation is when root pressure causes dew in the morning 4. Transpirational Pull: 5. evaporation of water from leaves creates __negative_____ water potential, drawing water up through xylem
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6. Water molecules adhere because of
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1202L8 - Ch. 36 Transport in Plants Understand how proton...

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