Prelab9

Shelby Johnson Pre-Lab 9 11/4/09
  1. If plants are placed in different environments, then the plant under a floodlight will exhibit the fastest rate of water loss because water is lost through the process of transpiration and guttation and the light will evaporate the water and dry up the plant.
  2. The controlled variable in this experiment is the room temperature plant.
  3. The dependent variable is the amount of water loss in the plants.
  4. The independent variable is the amount of time.
  5. Constants of this experiment include the amount of water each plant is given, the time period, the room temperature, and the same plant seed that is used.
  6. The water loss in mL is what is being measured for this experiment.
  7. The time frame of this experiment is 30 minutes and every 3 minutes I will record the water level in my data chart.
  8. The rate of calculation is the calculated class data for this experiment.
  9. I will verify my results through sample size and repetition.
  10. I will represent my data on a line graph for this experiment.
  11. My conclusion for this experiment is for my hypothesis to be correct by showing the fastest rate of water loss because the heat of the light will evaporate the plant’s moisture. Plants loss a lot of water through transpiration, which is the evaporation of water from the plant surface, and guttation, the loss of liquids from the ends of vascular tissues at the margins of leaves. If the water is not replaced then the plant will wilt and eventually die. The water moves by osmosis when it enters the xylem and then forces the fluid up by root pressure. Transpiration continues the movement of water upward and causes tension, which is from cohesion and adhesion of the water molecules.