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Transpiration Coursework

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Introduction

Transpiration Coursework -Planning I plan on conducting an experiment to find out whether the surface area and number of leaves on an individual stem has any effect on the change of weight of the leaves. Hypothesis- I predict that the leaves will all become lighter, and the more leaves on the stem, the more weight will be lost. I predict this because the water is taken back into the leaves, and is lost through the tiny holes in the leaves called stomata. The stems with more leaves on them will lose more weight, as there are more holes for the water to be lost through, also, the leave with the largest surface area will lose the most weight for the same reason. Apparatus- Test- tubes Privet bush cuttings Beaker Balance Scales Water- 15 ml Oil Measurements- I will use a balance to measure the new weight of each test- tube. I will measure the specific amount of water being poured into each test-tube, and I will measure the surface area of an average sized leaf on each stem. ...read more.

Middle

All of the test-tubes will always be kept together, so that no test-tube has any advantages or disadvantages over each other. I will weigh the starting weights (day 0) on the balance scales, and record this. I will then weigh all the leaves for 5 days. I will record and analyse my results. Diagram- (attached is a general diagram of how Transpiration occurs in plants)- Results- Day No. Leaves Surface Area Weight Weight Lost 0 6 8 10 12 14.5cm2 14.0cm2 12cm2 10.5cm2 35.16g 35.22g 33.76g 35.83g _ _ _ _ 1 6 8 10 12 14.5cm2 14.0cm2 12cm2 10.5cm2 34.47g 35.51g 33.13g 34.87g 0.69g 0.71g 0.63g 0.96g AV- 0.75g Lost 2 6 8 10 12 14.5cm2 14.0cm2 12cm2 10.5cm2 33.89g 34.70g 32.54g 34.87g 1.30g 1.52g 1.22g 1.79g AV- 1.46g Lost 3 6 8 10 12 14.5cm2 14.0cm2 12cm2 10.5cm2 32.84g 33.24g 31.45g 32.66g 2.32g 2.98g 2.31g 3.17g AV- 2.70g Lost 4 6 8 10 12 14.5cm2 14.0cm2 12cm2 10.5cm2 32.44g 32.64g 31.00g 32.08g 2.72g 3.58g 2.76g 3.75g AV- 3.09g Lost N.B- An average sized leaf from each test tube was taken for the surface area measurements. ...read more.

Conclusion

I could measure the temperature of the environment the leaves are being tested in, as it is known that temperature and the atmosphere have a great effect on the rate of transpiration. I could also vary the types of cuttings used, as the leaves used in my particular experiment were privet cuttings. I could see if the different types of leaves had different amounts of holes or had different rates in transpiration. I could have tried putting the cuttings in different solutions, instead of tap water; I could have varied temperatures or by using salt solutions. By doing this, I would have obtained a much wider variety of results, which would give me a deeper insight to the experiment. I could have varied the brightness of the environment that each test-tube was placed in, for example; light, dark, etc. I could have obtained a larger variety of results by doing the experiment for a longer period of time, which would show a more of a decreasing in weight. I could have also used more than four test tubes, as four test-tubes gave me a slightly limited group of results, although they were sufficient. ...read more.

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