Transpiration Project and Gravitropism Investigation

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Bree Howard
October 4, 2010
BISC 208 Sect. 34
Transpiration Project and Gravitropism Investigation
Introduction:
Transpiration is similar to evaporation; it’s the evaporation of water from plants. It mainly occurs at the leaves while their stomata are open. In a previous experiment we observed the transpiration rate of a plant and then we observed the transpiration rate after the leaves were cut off. In this experiment we observed the transpiration rate again, but instead of cutting the leaves off we observed the transpiration rate of wind on the plant. Thinking about wind I ask the scientific question: How does wind affect the transpiration rate? When you don’t have a breeze around the leaves on the plant it gets humid and can reduce the transpiration rate. Knowing this, we came to the hypothesis that if wind is increased the amount of transpiration will increase. Results:

The data below in (Fig.1) was obtained with having wind directly towards the leaves of the plant. The trend of wind vs. no wind is clearly seen with the increase in data numbers.

Figure1. One plant was used and the transpiration rate was measure over a period of 10 seconds. Discussion:
In this experiment we carried out our hypothesis: We predict that if the wind is increased the amount of transpiration will increase. Our data was acquired by using a plant and measuring the transpiration of the plant over a 4 min time period with each minute starting a new level of transpiration. At five minutes we changed the positions on the potometer and added wind to the plant and observed the transpiration rate of the plant with the affect of wind. After viewing the graph of the transpiration we analyzed the slop of each minute up to 10 minutes. Our slopes were kpa/min multiplying by 20. Once all of our numbers were calculated and graphed the data, with the minute intervals and the transpiration rate, we observed the data from 1-5 minutes being the transpiration rate without wind. Then we...
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