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Introduction

Design lab for the IB Internal Assessment Background information According to "ATMOSPHERIC SCIENCES", transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. Plants absorb soil water through their roots and this water can originate from deep in the soil. Plants pump the water up from the soil to deliver nutrients to their leaves. This pumping is driven by the evaporation of water through small pores called "stomates", which are found on the undersides of leaves. ASPECT 1 Research question The effect of temperature on the rate of transpiration of Hibiscus sp? Hypothesis If the temperature increases, then the rate of transpiration will increase as well as the rate of diffusion between the air spaces inside the leaf and the air outside. ...read more.

Middle

Light intensity Use the same light bulb and keep the distance between the light and the photometer constant in all the experiments. Potometer Use the same potometer in order to prevent any anomalies. Moreover, the water syringe and the tube placed in the potometer should also be the same, so the volume of the water can be kept constant. Time The time to equilibrate and the time in measuring the air bubbles should be the same for all the experiments. Materials - Potometer - Plant specimen - Incubator - Stopwatch - Ruler - Water Procedure 1. Make sure experimenters use the same room during the experiment, in order to have a constant wind speed and humidity. ...read more.

Conclusion

10. Repeat steps 1 to 9, changing the water temperature in the incubator to 15�C, 25�C, 35�C and 45�C. Ensure that all the other variables are kept constant ASPECT 3 Data Collection The effect of temperature on the rate of transpiration of Hibiscus sp Temperature of the water placed in the syringe as well as the potometer tube (�C) Distance moved by the air bubble (mm) Trials Average 1 2 3 5 15 25 35 45 1 1 "Transport and Water Relations." Skoool. 2007. Intel Corporation. <http://www.skoool.co.za/studynotes/science/id222.htm>. 2 "Transpiration." ATMOSPHERIC SCIENCES: University of Illinois at Urbana-Champaign. Department of Atmospheric Sciences (DAS) at University of Illinois at Urbana-Champaign. <http://ww2010.atmos.uiuc.edu/(gh)/guides/mtr/hyd/trsp.rxml>. ?? ?? ?? ?? Biology IBS October 13, 2008 Kyung Jin Kim Biology IBS October 09, 2008 Kyung Jin Kim Biology IBS October 09, 2008 ...read more.

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