Practical - lab report transpiration PDF

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lab report transpiration ...

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Biology 1108 section 13 Transpiration Lab

1.

a. Graph 1 is of the rate at which water is loss in the Helianthus annus plant under three conditions: the control, fan, and shade. 200

182

180

Average Transpiration Rate

160 140 2 Average 120Transpiration mmole/m /sec

106

100 80

69.27

60 40 20 0

2.

Control

Fan

Shade

a. Graph 2 is of the rate of transpiration loss in the Helianthus annus plant under three conditions: the control, fan, and shade.

3.

a. Graph 3 is of the average mole fraction gradient in the Helianthus annus plant under three conditions: the control, fan, and shade. 200

182

180

Average Conductance Rate

160 140

Conductance (mmole/m2/sec) 120 06

100 80

69.27

60 40 20 0

4.

Control

Fan

Shade

a. Graph 4 is of the average conductance rate in the Helianthus annus plant under three conditions: the control, fan, and shade. Transpiration is the rate at which water is loss through the leaves when the stomata are open. The water is escaped as water vapor and transpiration serves to cool down the temperature inside the plant. Our hypothesis was that the rate of transpiration will be faster with a fan and slower with the shade. As the experiment concluded, our hypothesis was proven to be true. We found out that with the fan, the wind takes away a layer of saturated water therefore producing a faster rate of transpiration. When the plant is put in the shade, the stomata close. The opening of the stomata is triggered by sunlight. Without enough sunlight, the levels of carbon dioxide are decreased, thus making photosynthesis harder complete and transpiration rates lower. Likely sources of error occurred during the fan treatment of our experiment, and during 1 and 3 minutes of the shade treatment. We recorded the pipet level a few seconds over the ideal time, so

in our graphs it is evident when the rate of water loss had a sudden jump in in data compared to the other minutes....