Edexcel IGCSE Biology 2.58B Transpiration practical
Practise planning and analysing leafy shoot transpiration investigations using potometers, bubbles, repeats and rate calculations.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- describe a potometer setup with a sealed shoot, capillary tube, bubble and scale
- calculate water uptake rate from bubble movement, tube dimensions or mass change over time
- explain why repeats, controlled conditions and a comparison plant improve reliability
2.58B Transpiration practical question 1
A student investigates the rate of evaporation from a clay pot and the rate of transpiration by a plant. The clay pot is porous and has small holes that allow water to evaporate.
The student keeps the clay pot and the plant in the same conditions next to a closed window. He measures the rates at different times of the day.
The table shows the student's results.
Draw a labelled diagram of the apparatus the student could use to determine the rate of transpiration by a plant.
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