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# internal assessment rate of transpiration

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Introduction

Research question How can the rate of transpiration of plant at different atmospheric condition namely light, humidity of air, and speed of air be measured? Hypothesis Transpiration is a process where plant losses its water in form of water vapuor to surrounding via stomata. This will cause losses of amount of water initially from apparatus to surrounding. Therefore, rate of transpiration under different atmospheric condition can be obtained by measuring the weight loss of of entire apparatus by using spring balance. As the light intensity is hihg, humidity of air is low, and speed of wind is high, the rate of transpiration will be higher. Introduction Transpiration is a process where plant losses its water in form of water vapuor to surrounding via stomata. Transpiration process can be affected by different atmospheric condition such as light, humidity of air, temperature and also speed of winds. Aim To measure the rate of transpiration of a cut twig under different atmospheric condition namely light, humidity of air, and speed of wind. Materials and method Refer to attachment page 83 Variables There were three sets of apparatus arrangement. Each apparatus has different variables. The apparatus were categorized to SET A, SET B, and SET C. Variable for SET A Independent : Intensity of light Dependant : Amount of weight loss of entire apparatus Constant : Humidity of air, speed of wind, type of plant, numbers of leaf. ...read more.

Middle

Changes mass of entire apparatus, grams (g) � 0.1 Rate of transpiration, gram per minutes ( ) Normal humidity of air in room condition Less humidity of air with present of sodium bicarbonate 30.00 0.00 0.00 2.0 0.07 Table 5; the rate of transpiration of plant at different humidity of air with respect to time. Graph 2; the rate of transpiration versus different humidity of air. SET C Total time taken, minutes (min) � 0.01 Changes of mass of entire apparatus, grams (g) � 0.1 Rate of transpiration, gram per minutes ( ) Changes mass of entire apparatus, grams (g) � 0.1 Rate of transpiration, gram per minutes ( ) High speed of wind (under fan) Low speed of wind (normal room condition) 30.00 4.5 0.1 1.5 0.03 Table 6; the rate of transpiration of plant at different speed of wind with respect to time. Graph 3; the rate of transpiration versus speed of wind. Discussion and evaluation 1. Transpiration is a process where plants losses its water in form of water vapour, to surrounding via stomata. This process can be affected by atmospheric condition namely light intensity, humidity of air, and speed of air. 2. According to theory, as the light intensity is higher, the rate of transpiration will also increase. This is because; guard cells will close the stomata during darkness. ...read more.

Conclusion

And the rate of transpiration can be measeured accurately. Questions 1. How would an air column drawn into the xylem affect your result? An air column would disturb the continuous flow of water in the xylem vessel. This will cause huge impact on the normal function of the cohesive forces as it is vital for transpiration to occur. As cohesive forces can only be formed between molecules which are alike, the presence of air column will not allow any cohesion of water to take place. This will cause the water column below not to be pulled together and hence cannot be transpired. 2. State the other precautions you take? a. A layer of oil is added in the boiling tube so that to ensure that the weight loss is caused solely by transpiration, not via evaporation. b. The stem was cut under water to prevent air column to be drawn into the xylem. 3. Is there a trend in the result? No. The rate of transpiration showed different rate according to different atmospheric condition. 4. Under what condition does transpiration occur at greatest rate? Transpiration will occur at greatest rate under conditions whereby light intensity and wind speed are relatively high but at low level of humidity. ?? ?? ?? ?? To measure the rate of transpiration of a cut twig under different atmospheric condition AMAHD UNONIS, MUHAMAD NAZRI M08L 1 ...read more.

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