Transpiration Lab Write Up

Topics: Photosynthesis, Leaf, Transpiration Pages: 3 (759 words) Published: March 20, 2013
Transpiration Lab Write Up

How do environmental factors affect the transpiration process in plants?

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves. It occurs chiefly at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis. Transpiration is not simply a hazard of plant life. It is the "engine" that pulls water up from the roots to supply photosynthesis (1%-2% of the total), bring minerals from the roots for biosynthesis within the leaf, and cool the leaf. There are four different conditions that affect transpiration. They are wind, humidity, heat, and light. These four conditions may change rate of water loss through transpiration by either losing more water, or less. Plants have adapted to create the C4, and CAM pathway. In the both pathway the plant takes CO2 and stored. Since CO2 can be taken up and stored for later use in photosynthesis, the plant reduces water loss by having less stomata open during the day since most of its needed CO2 has already been taken up at night. With the abundance of CO2 stored, the plant can then use the stored CO2 for photosynthesis and reducing photorespiration by reducing or completely eliminating accidental O2 uptake. Materials:

1) 5 small plants
2) Fish tank
3) Water spray bottle
4) Water
5) Heat lamp
6) Fan
7) Regular lamp
8) Mass weighter
9) Place to record weight
Place Lamp, Heat lamp, fan, and fish tank in different areas where they won’t affect the other. Spray the fish tank with water and to make a humid environment and keep spraying everyday to ensure the tank is wet. Water all of your plants. Weigh all the plants on the original day, Monday, and record the weight. Place a plant in every...
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