1. Transpiration

2. Is the process in which the plant losses water vapor

3. Transpiration Water is first absorbed by the root hairs of the plant Root hairs protrude from the tap or fibrous roots

5. Transpiration From the roots, water moves to the leaves by means of the xylem

7. Transpiration Water exits the leaves through openings in the leaves called stomata

9. Factors Affecting Transpiration Temperature Humidity Air Currents CO 2 Soil Water Availability

10. Affects of Temperature and Humidity

11. Air Currents Affect Transpiration Wind removes water vapor that is in the area immediate to the plant. This removal of water vapor decreases the water potential of the air in that area. Since water moves from higher to lower potential areas, the decrease in potential increases the rate of transpiration

12. Affects of CO 2 on Transpiration If carbon dioxide concentration in the air increases, the plant will have its stomata open less. With the stomata open less, the amount of transpiration decreases.

13. Soil Water Availability As soil water availability increases, the plant will have more excess water to move through the plant. Therefore, increasing water availability in the soil will increase the rate of transpiration.