# Transpiration Lab.docx - INTRODUCTION Question Background...

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Chapter 9 / Exercise 35
Mathematics for Elementary School Teachers
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INTRODUCTION Question Background Hypothesis Does light intensity affect the rate of transpiration of the leaf? Transpiration is the water loss in the leaves as water moves in, through, and out of the plant. The loss of water occurs in the stomata as the guard cells open and close in response gas exchange for photosynthesis. The guard cells control the stomata to minimize the water loss of a plant. When the guard cells are full of water, the stomata open, and when the guard cells lack water, the stomata close. As water leaves the stomata, there is a decrease in water potential in air spaces. Since water potential moves from a concentration of high to low, water is pulled up from the soil into the roots by osmosis, and the the water moves up the xylem. The water sticks together using cohesion and adhesion as it moves up the xylem to the leaves. From there, the stomata opens as water is released from the leaf and evaporated into the air. However, plants must maintain a balance of transpiration and photosynthesis because if too much water is lost, then photosynthesis decreases causing the plant to wilt. If the amount of light exposed to the plant increases, then the rate of transpiration will also increase? The Effect of Light Intensity on the Rate of Transpiration By: Lauren Baccari
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Chapter 9 / Exercise 35
Mathematics for Elementary School Teachers
Bassarear
Expert Verified
METHODOLOGY Procedure Materials Variables 1) Put the tip of the 1.0 mL pipette into the 16 inch tube. 2) Submerge the tubing and pipette into a tray of water. 3) Use the syringe to draw out water through the tubing to get rid of air bubbles. 4) While the tubing is submerged, insert the freshly cut stem leaf into the open end of the tubing and apply vaseline to the stem to avoid water loss.