Investigating Transpiration Rate

 

What is "Investigating Transpiration Rate"?

Idea: You’re finding out how fast a plant loses water from its leaves. It’s like timing how quickly a wet towel dries in the sun—the faster it dries, the faster water is leaving.

 

How Do We Measure It?

Tool Used: A potometer, which measures how much water a plant takes up as it transpires.

How a Potometer Works:

1. A cut plant stem is placed in a water-filled tube.
2. An air bubble is introduced.
3. As the plant transpires, it “pulls” water up, moving the bubble along.
4. Measure how far the bubble moves in a given time to find the transpiration rate.

Think of it like a tiny thermometer, but instead of mercury rising, a bubble moves as the plant “drinks” water!

 

Changing Conditions to Test Rate

You can alter:

• Light intensity: Brighter light often means faster transpiration.
• Temperature: Warmer surroundings can speed up water loss.
• Wind: More breeze often increases the rate.