Peka Science F3

Name: Nabil Jazli Bin Jazlan Class: 3S Date: 14 April 2009

Factor Affecting Rate of Transpiration (Wind) Aim: To study how wind affects the rate of transpiration

Problem Statement: Is the rate of transpiration affected by wind? Hypothesis: Windy condition increases the rate of transpiration in plants. Fixed variables: Size and type of plant, light, humidity, temperature and time. Manipulated variable: Presence of Wind Responding variable: Rate of difference in weight of the apparatus

transpiration

and

Materials and apparatus: Young balsam plants of similar size with the same number of leaves, cooking oil, cotton wool, water, conical flask, stopwatch, fan and beam balance. Procedure: Two weight potometers are setup. 2. Take the initial reading of the beam balance. 3. Place Potometer K under room condition as a control experiment. 4. Place Potometer L near a fan. Switch on the fan. 5. Take the final reading of the beam balance after 2 hours. 6. Results are tabulated and the rate of transpiration is calculated. 1.

Result/Observation:

Initial reading (g) Potometer K Potometer L

31.8 31.8

Final reading The (g) difference in reading 31.6 0.2 31.1 0.7

Interpreting data: • Calculation Potometer K: Rate of transpiration = 0.2g/2 hours = 0.1g/hour Potometer L: Rate of transpiration = 0.7g/2 hours = 0./hour

• Relationship between manipulated variable and responding variable The stronger the wind, the faster the rate of transpiration.

Conclusion: The presents of wind, the facts of the rate of transpiration.