AP Biology Lab 9: Transpiration

The video tutorial provides a walkthrough of AP Biology Lab 9, focusing on transpiration. It explains the process of water moving up a tree, the role of stomata, and how different conditions affect transpiration rates. The lab setups include experiments with light, mist, and air flow. Data analysis shows a linear relationship between conditions and transpiration rate, with light being the fastest. The tutorial concludes with a summary of how temperature, humidity, air, and light intensity affect transpiration.

What is the primary role of stomata in the process of transpiration?

• To transport nutrients

• To allow water to evaporate

• To facilitate gas exchange

• To absorb sunlight

In the lab setup with a leaf inside a bag with mist, what is the expected effect on transpiration?

• Transpiration stops completely

• Increased transpiration

• Decreased transpiration

• No change in transpiration

Which lab setup is expected to show the fastest rate of transpiration?

• Leaf in a bag with mist

• Leaf in front of a light bulb

• Standard room setup

• Leaf with a fan blowing on it

What does the slope of the line in the transpiration data represent?

• The rate of transpiration

• The total amount of water evaporated

• The temperature of the environment

• The humidity level

How does increasing temperature affect the rate of transpiration?

• It stops transpiration

• It increases the rate

• It has no effect

• It decreases the rate

What is the relationship between humidity and transpiration rate?

• Direct relationship

• Inverse relationship

• No relationship

• Exponential relationship

Which factor directly increases the movement of water molecules away from the leaf?

• Leaf size

• Air movement

• Humidity

• Soil moisture