Plant Transpiration

1. Describe the process of transpiration in vascular plants.
1. Transpiration is the process in which vascular plants gain nutrients and lose excess water/moisture. 
2. Describe any experimental controls used in the Investigation.
1. The amount of time 
3. What environmental factors that you tested increased the rate of transpiration? Was the rate of transpiration increased for all plants tested?
1. Temperature, heat, light, and wind. 
2. Yes, the rate of transpiration was increased for all plants.
4. Did any of the environmental factors (heat, light, or wind) increase the transpiration rate more than the others? Why?
1. Yes, the wind from the fan increased the transpiration rate more than the others, probably because 
5. Which species of plants that you tested had the highest transpiration rates? Why do you think different species of plants transpire at different rates?
1. Rubber plants had the highest transpiration rates. 
2. Maybe because they come from different environments.
6. Suppose you coated the leaves of a plant with petroleum jelly. How would the plant's rate of transpiration be affected?
1. The process of transpiration would completely stop, stopping the loss of water.
7. Of what value to a plant is the ability to lose water through transpiration?
1. Because water has cohesion between molecules it is drawn up when the water evaporates, carrying any dissolved nutrients upwards with the water. Having the ability to draw water and nutrients upwards to the leaves allows plants to spread the leaves to intercept more sunlight. Transpiration raises the air humidity and moderates the daily change in temperature.

Table

3.6	7.5	6.6	4.0
0.9	6.0	3.9	3.0
2.9	4.6	4.1	3.0
4.1	7.7	6.0	3.9
1.8	5.1	3.2	2.1
1.2	4.7	5.8	2.4
4.9	8.4	6.8	4.3
3.3	6.1	4.9	2.5
4.2	7.6	6.1	3.2