Hannah DeYoung Cramer Pride October 12, 2017 Transpiration Lab Report Statement of the Problem: The problem for this lab activity is to determine how different environmental conditions affect the rate of transpiration in corn plants. Hypothesis: If there is a relationship between environmental conditions and the transpiration rate of corn plants, then the plant exposed to high temperatures should have the highest transpiration rate because higher temperatures cause the plant cells which control the stoma (or openings) where water is released to the atmosphere to open. Stomata and Guard cells: Stomata are tiny openings under the surface of plant leaves that are used for gas exchange that include a cell wall, chloroplasts, vacuoles, and nucleus. Stomata have a pair of guard cells for each stoma, surrounding them like kidney beans. Guard cells help with opening and closing the stomata to regulate the rate of transpiration. When the guard cells become flaccid, the stoma opening (an individual pore) closes and keeps water in. When the guard cells become swollen, the stoma opening gets large and allows water to exit which is referred to as transpiration. The Control: The "control" is a parallel experiment in which everything is identical except for the independent variables which are being investigated for their effect and the dependent variables which are the effect itself. A control has a neutral outcome. The control’s purpose in an experiment is to have a baseline comparison of the results of the effect of the independent and dependant variables. The
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