Lecture+18+-+Water+_+Plant+Cells

Lecture+18+-+Water+_+Plant+Cells - Water &...

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Unformatted text preview: Water & Plant Cells 3.1 Corn yield as a function of water availability Water and Plant Cells Water is an important factor in plant growth 3.2 Productivity of various ecosystems as a function of annual precipitation Water is necessary for plants- All living functions are performed in aqueous medium- Photosynthesis- 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2- Heat dissipation- mechanical support (herbaceous plants) Water transport in plant cells Different mechanisms of water transport are involved 1) Diffusion (water movement along a concentration gradient) 2) Osmosis (Water movement through selectively permeable membranes) 3) Mass flow (transport through vessel elements) 3.3 Diagram of the water molecule Mechanisms of water transport is related to chemical & physical properties of water Water is a polar molecule Polarity of water results in hydrogen bonds- Water is an excellent solvent due to hydrogen bonding- Water creates hydration shells- Thermal properties of water are decided by hydrogen bonding- Specific heat : heat energy necessary to raise the temperature of water by a specific amount...
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Lecture+18+-+Water+_+Plant+Cells - Water &...

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