Semester One EEI Water Movement In Plants
Group Members: Daniel Turner, Long Nguyen
The objective of this investigation was to determine the effect of one specific environmental condition on the rate of transpiration in plants. This particular investigation looked at the number of leaves in a plant and how it would affect the rate of transpiration in plants. The aim of this investigation was to find out if the larger the number of leaves a plant had, the higher the rate of transpiration would be. The results from this investigation showed increased transpiration in the plants with the greater number of leaves compared to the ones with less leaves. To determine the validity of this claim, the same plants with different numbers of leaves were tested with same amounts of water, same temperature, and same apparatus and other carefully controlled variables. Introduction
1Plants draw water in through their roots, and then transport it through the xylem up to the branches and leaves. Water exits the leaves through the stomata in the form of water vapour. Polarity causes the water exiting through the stomata to draw after it the water in the xylem, which then pulls in more water through the roots. This process is known as transpiration (Raven, 2002). This report will talk about biological theories and values on transpiration as well as transpiration rates and how the results of this investigation can be applied and shown in real world applications. Finding a successful method to grow plants and food can be very difficult; there are so many variables to cope with such as water, the pH of water, the temperature, wind, sunlight, temperature and other crucial variables. Plants that are grown in the ground have many more variables and factors to deal with compared to plants in science labs. 2For example plants that are grown in soil have to deal with Turgor pressure (turgidity) which is the main pressure of the cells contents against the cell wall in plant cells; this force gives the plant structural balance and physical growth as it expands the plant cells. Transpiration is a vitally important process in plants, and to study it further the experimenters designed and conducted an experiment to measure the rate of transpiration in the same plants with different numbers of leaves. The numbers of leaves for each different plant in the experiment being 0, 4, 8 & 12 respectively.
The aim of this investigation was to find out if the greater the number of leaves a plant had, the higher the rate of transpiration would be. The hypothesis of this investigation is that the more leaves and the larger the leaves a plant had the more water would be transpired. Materials
* 4x 250mL graduated cylinders
* 4x plants of the same species with different numbers of leaves (0,4,8,12) * Distilled Water
* Vegetable Oil
* 1 pipette
This investigation had many variables to control such as wind, sunlight, fertiliser, temperature and water. The experimenters tried to control all variables by allowing the plants to be grown in an open space where all plants receive equal shade, sunlight, wind and nutrients in the soil.
1. All plants and apparatus were gathered and labelled.
2. All five graduated cylinders were filled with distilled water to 190mL. 3. Plants with appropriate numbers of leaves were placed into the cylinders. 4. A thin layer of oil (approx 1mL) was poured into each cylinder. 5. The original volume of water (190mL) of each graduated cylinder was recorded. 6. Results were taken every 24 hours.
7. All plants and apparatus were gathered, cleaned and put away. Results
Results of Experiment One
| Plant 1 (0 leaves)
| Plant 2 (4 leaves)
| Plant 3 (8 leaves)
| Plant 4 (12 leaves)
| 190 mL
| 190 mL
| 190 mL
| 190 mL
| 188 mL
| 187 mL
Bibliography: Book Sources
Raven, P. H., G. B. Johnson, J. B. Losos, S. R. Singer. 2002. Biology, Seventh Edition. McGraw Hill, Boston. 1250 pp.
Greenaway, T.G, 2000, “The Plant Kingdom”, Steck-Vaughn Publishers, Austin
Barret, Dent, R.B, P.D, Australian Environments Place, Pattern and Process, Second Edition, MacMillan Education Australia PTY LTD
LetUsFindOutTeam(author), 2008, Why do plants need water?-Solvent, Transport, Photosynthesis, Evaporation, Turgidity, accessed 24 April.
Unknown, 2009, Transpiration, accessed 25 April.
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