Transpiration - Transpiration (25 points) For this...

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1 Transpiration (25 points) For this assignment you will examine some of the physiological principles that enable plants to do the amazing things that they do. As you know, we are dependent upon plants as a source of the oxygen that we breathe and, directly or indirectly, the food that we eat. Plants, unlike us, are able to take the energy in sunlight and use it to convert simple inorganic compounds, water and carbon dioxide , into complex, organic compounds that all living things use for energy to grow, develop and reproduce. Plant roots absorb the minerals and water they need for photosynthesis and nutrition from the soil. The carbon dioxide enters the plants from the atmosphere through tiny pores in their leaves called stomata. Stomata must be open for carbon dioxide to enter the leaves but this leads to a dilemma! At the same time carbon dioxide enters the leaf through the stomatal opening, water vapor is lost. This evaporation of water from leaves is called transpiration . The amount of water vapor that is transpired from plant leaves is astounding; a single date palm like those on our campus is estimated to lose over 100 gallons of water every day! Transpiration is however, a necessary process. It is the evaporation of water from the stomatal pores on the surface of leaves that creates a pull on the water column that
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This note was uploaded on 01/30/2010 for the course NATS 104 taught by Professor Lewis during the Winter '08 term at University of Arizona- Tucson.

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Transpiration - Transpiration (25 points) For this...

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