Zandile found that as the temperature increased, the transpiration rate also increased, leading to increased water loss from the plant. This experiment helped her conclude that temperature directly affects transpiration rates.
Transpiration is the process of water movement through the plants from roots to leaves, and eventually lost by evaporation from the stomata. Various factors, including temperature, humidity, light, and wind, influence the transpiration rate.
Temperature affects transpiration as it affects the diffusion rate of water vapor from the leaves into the surrounding air.
To investigate how temperature affects transpiration rate, Zandile set up an apparatus comprising a potted plant, a beaker, and a thermometer. The plant was selected for the experiment, and its leaves were covered with a plastic bag to prevent any water loss through the leaves' surface.
The apparatus was set up in the following way: The plant was placed in a beaker containing water. The beaker was placed on a heat source, and the temperature was monitored with the help of a thermometer. The plastic bag was tied around the stem to ensure no air entered the plastic bag, making the experiment airtight.
Zandile then increased the temperature by placing the beaker on a heat source. She noted the temperature of the water in the beaker and the temperature inside the plastic bag. She continued to monitor the temperature and the rate of water loss from the plant.
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