Here is my data table:
Normal With Fan With Heat With Lamp
3.6
|
7.5
|
6.6
|
4
|
0.9
|
6
|
3.9
|
3
|
2.9
|
4.6
|
4.1
|
3
|
4.1
|
7.7
|
6
|
3.9
|
1.8
|
5.1
|
3.2
|
2.1
|
1.2
|
4.7
|
5.8
|
2.4
|
4.9
|
8.4
|
6.8
|
4.5
|
3.3
|
6.1
|
4.9
|
2.5
|
4.2
|
7.6
|
6.1
|
3.2
|
Journal Questions:
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- Describe the process of transpiration in vascular plants.
- Transpiration is the evaporation of water from the leaves and stems of plants into the atmosphere. Water travels from the soil into the roots and then to the stomates, which are small openings underneath leaves that are connected to the vascular tissue of plants. Transpiration is regulated by humidity in the atmosphere and moisture in the soil.
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- Describe any experimental controls used in the Investigation.
- The controls were the "normal" ones. Instead of using outside factors to affect transpiration, each plant had one time where no external efects were imposing on the plant.
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- What environmental factors that you tested increased the rate of transpiration? Was the rate of transpiration increased for all plants tested?
- The fan had the most increased rate of traspiration. Every plant had an increased rate with the fan. Heat, Light, and the fan all increased the rate. The zebra plant was the only one that had less rate for the light than the normal.
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- Did any of the environmental factors (heat, light, or wind) increase the transpiration rate more than the others? Why?
- The wind from the fan had the most increased rate. This is because wind removes the boundary layer which is a still layer of water that hugs the surface of the leaf. Wind also increases the movement of water on the surface of the leaf.
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- Which species of plants that you tested had the highest transpiration rates? Why do you think different species of plants transpire at different rates?
- The Rubber Plant had one of the most highest rates. The larger the leaf, the larger the surface area so more opportunity to do transpiration. Also the moisture of the soil and the nutrients available factor in.
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- Suppose you coated the leaves of a plant with petroleum jelly. How would the plant's rate of transpiration be affected?
- The petroleum jelly would block the stomates and transpiration would not be in effect.
- -----------------
- Of what value to a plant is the ability to lose water through transpiration?
- Transpiration raises air humidity and moderates daily change in temperature. Evaportaion cools the leaves. Transpiration allows the leaves to spread and they will get more sunlight. There is a transpiration flow in the xylem which carries dissolved nutrients up with the water.
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