# Investigating Transpiration in Plants

Investigating Transpiration in Plants Hypothesis I predict that the plant will loose more water through transpiration when the fan is closer to the plant. I think that the distance of the fan from the plant and the water loss are inversely proportional, that is the greater the distance between fan and plant, the smaller the percentage loss of mass. I predict also that at a certain distance, the fan will no longer have an effect, or minimal effect, on the transpiration of the plant and the water loss will be constant. At this point the best fit line will be a near-horizontal line close to the axis, showing virtually zero water loss (excluding evaporation and other effects). These two predictions together suggest that the best fit for the two trends described will be a curve as shown.. Analysis (see graph overleaf) ========= The graph shows the relationship between the distance of the fan from the plant, and the % change of mass in the plant. From the graph, I can see that:- 1. The plant is losing water/transpiring when placed near a fan, because all the % changes in mass are negative numbers, and this shows the mass is going down. 2. There is an anomalous result at 100cm. This is so far away from the other readings that it should be disregarded. 3. There is a pattern in my results, disregarding the anomalous result. I can see that there is the greatest water loss when the fan is closest and least at the furthest distance. For example, at 40cm the % change of mass is -0.31%, and at 60cm the % change of mass is -0.28. It is losing more water when the fan is closest, so the water loss is inversely proportional to the distance of the fan from the plant. The line of best fit illustrates this trend.