Measuring Rate of Rater Uptake by a Leafy Shoot :: Papers

Measuring Rate of Rater Uptake by a Leafy Shoot The water uptake can be measured easily and because very high proportion of the water taken up by a stem is lost in transpiration, it enables the rate of transpiration to be measured. Key Factors to be kept Constant: - ================================== v Temperature - room temperature (approximately 25Â ºC) v Wind speed - No artificial wind was produced to affect results v Light intensity - Extra light was not used v Humidity - it was not humid on the day experiments were conducted The water uptake for the control Experiment. Time (minutes) Initial meniscus position of the air bubble (cm) Final meniscus positionof the air bubble (cm) Water uptake (Distance moved) (cm) Total water uptake (cm) 1 10.0 10.7 0.7 0.7 2 10.7 11.5 0.8 1.5 3 11.5 12.3 0.8 2.3 4 12.3 13.0 0.7 3.0 5 13.0 14.0 1.0 4.0 6 14.0 14.8 0.8 4.8 The water uptake when Vaseline is applied on the top surface of the leaves. Time (minutes) Initial meniscus position of the air bubble (cm) Final meniscus positionof the air bubble (cm) Water uptake (Distance moved) (cm) Total water uptake (cm) 1 6.0 6.6 0.6 0.6 2 6.6 7.2 0.6 1.2 3 7.2 7.9 0.7 1.9 4 7.9 8.5 0.6 2.5 5 8.5 9.2 0.7 3.2 6 9.2 9.7 0.5 3.7 Time (minutes) Initial meniscus position of the air bubble (cm)