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The Chapter 29 Homework is due on Monday, March 30 at 11:59 pm The Chapter 29 Test is on Tuesday, March 31.

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Presentation on theme: "The Chapter 29 Homework is due on Monday, March 30 at 11:59 pm The Chapter 29 Test is on Tuesday, March 31."— Presentation transcript:

1 The Chapter 29 Homework is due on Monday, March 30 at 11:59 pm The Chapter 29 Test is on Tuesday, March 31.

2 Chapter 29 Transport and Water Potential

3 You Must Know How passive transport, active transport, and cotransport function to move materials across plant cell membranes. The role of water potential in predicting movement of water in plants.

4 Concept 29.1: Adaptations for acquiring resources were key steps in the evolution of vascular plants © 2014 Pearson Education, Inc.

5 Figure H 2 O and minerals H2OH2O Xylem The plant does not have to expend any energy to transport water through the xylem What substances do plants need for photosynthesis? What substances do plants need for respiration?

6 Figure H 2 O and minerals H2OH2O O2O2 CO 2 O2O2

7 Figure Light H 2 O and minerals H2OH2O Sugar O2O2 CO 2 O2O2 Phloem transports photosynthetic products from sources to sinks.

8 Video clip of water transport.

9 Adaptations in each species represent compromises between enhancing photosynthesis and minimizing water loss. © 2014 Pearson Education, Inc. Sugarcane Corn Switch grass

10 CYTOPLASM EXTRACELLULAR FLUID Proton pump Hydrogen ion (a) H  and membrane potential HH HH HH HH HH HH HH HH Figure 29.5 Solute transport across plant cell plasma membranes Sucrose (neutral solute) (b) H  and cotransport of neutral solutes H  /sucrose cotransporter S HH HH HH HH HH HH HH HH HH HH HH S S S S S Nitrate (c) H  and cotransport of ions H  /NO 3 − cotransporter NO 3 − HH HH HH HH HH HH HH HH HH HH HH Potassium ion Ion channel (d) Ion channels KK KK KK KK KK KK KK

11 Short-Distance Transport of Water Across Plasma Membranes To survive, plants must balance water uptake and loss. Osmosis determines the net uptake or water loss by a cell and is affected by solute concentration and pressure. © 2014 Pearson Education, Inc.

12 Water potential is a measurement that combines the effects of solute concentration and pressure. Water potential determines the direction of movement of water. Water flows from regions of higher water potential to regions of lower water potential. Potential refers to water’s capacity to perform work. © 2014 Pearson Education, Inc.

13 Water potential is abbreviated as  and measured in a unit of pressure called the megapascal (MPa)   0 MPa for pure water at sea level and at room temperature.   S  P  S  P © 2014 Pearson Education, Inc.

14 Turgor pressure is the pressure exerted by the plasma membrane against the cell wall, and the cell wall against the protoplast. © 2014 Pearson Education, Inc. Flaccid Turgid

15 −0.7 Figure 29.6b Initial flaccid cell: −0.7 MPa   PSPS Turgid cell at osmotic equilibrium with its surroundings Pure water: (b) Initial conditions: cellular   environmental  0 MPa  0000  PSPS  0.7  PSPS 0 −0.7

16 −0.9 Figure 29.6a Plasmolyzed cell at osmotic equilibrium with its surroundings 0.4 M sucrose solution: (a) Initial conditions: cellular   environmental  −0.9 MPa   −0.9  PSPS Initial flaccid cell: −0.9 MPa    PSPS −0.7 MPa  −0.7  PSPS 0 0 0

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