Results – provided Analysis of results To calculate the leafs surface area, each leaf was laid down a grid and traced. The trace was then counted for each 1-cm it covered on the grid(56). The total surface area was divided by the number of leafs which was 4 to get the leaf surface area for meter squared (14m). A graph was then made for the data of the each reading of the potometer for every 3 minutes. The independent variable was the time in minutes, and the dependent variable was the amount of water loss in the potometer in milliliters. Discussion A cross section of the stem is found on page two under the introduction. An increase of light increases transpiration because photosynthesis is occuring at a higher rate. Wind speed or the fan in the experimental group increases transpiration because it moves water vapor away from the plant, thus lowering the water potentail outside the plant allowing more water to evaporate out the plant. A misty environment would decrease transpiration because since the environment has a higher water concentration the plant has a lower water potentail inside the plant’s leaves. Osmosis would not occur effeciently due to equal water potentails inside the plant and outside the plant. The role of water potential in the movement of water from soil through the plant and into the air is to cause osmosis and passive transport of water throughout the plant. Water moves from high to lower concentrations without the use of energy and therefore makes the plants ability to control water potentail important because it needs a specific water potentails to move water efficiently from the root system and out the plant. The disadvantages of a closed
You've reached the end of your free preview.
Want to read all 4 pages?