Aiming for Grade 4 LOs:

• Recognise the factors that affect transpiration.
• Describe how a potometer can be used to estimate the volume of water lost by a plant.
• Identify control variables when investigating rate of transpiration.

Aiming for Grade 6 LOs:

• Explain why temperature, humidity, light intensity, and amount of air flow affect the rate of transpiration.
• Describe the differences between a moving bubble potometer and a mass potometer.
• Make a prediction using scientific knowledge when investigating rate of transpiration.

Aiming for Grade 8 LOs:

• Apply particle model to explain in detail why temperature, humidity, light intensity, and amount of air flow affect the rate of transpiration.
• Summarise plant adaptations to control water loss, and explain how they work.
• Evaluate in detail the use of a potometer to measure the rate of transpiration.