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Edexcel IGCSE Biology 2 58b Transpiration Practical Questions

Practise planning and analysing leafy-shoot transpiration investigations. Set up bubble or mass potometers, control environmental conditions, repeat measurements, and calculate rates from water movement or mass change.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • Describe how to set up a potometer, including cutting the shoot under water, sealing connections, introducing or resetting a bubble, and measuring movement over a set time.
  • Calculate water-uptake or transpiration rate from bubble distance, capillary-tube dimensions, volume, or mass change, with appropriate time units.
  • Explain how repeats and controlled environmental conditions improve reliability or validity, and use a comparison plant or shoot when testing an environmental factor.

Edexcel IGCSE Biology 2 58b Transpiration Practical Questions question 1

[Maximum number: 4]

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.

Table for Question Edexcel IGCSE Biology 2 58b Transpiration Practical Questions question 1 — Edexcel IGCSE Biology

Draw a labelled diagram of the apparatus the student could use to determine the rate of transpiration by a plant.

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