A student investigates the effect of temperature on water uptake by a leafy shoot. The student also moves a fan closer to the shoot when the temperature is increased.
Why does this make the results difficult to interpret?
Air movement prevents evaporation, so temperature cannot affect water uptake.
Air movement also affects water uptake, so two variables have changed.
Air movement only affects sucrose transport, so two variables have changed.
Air movement closes all stomata, so temperature cannot affect water uptake.
43 exam-style questions on Edexcel GCSE Biology 6.2 Transport in plants, covering 6.2.1 Root hair cell adaptations, 6.2.2 Structure of xylem and phloem, 6.2.3 Transpiration and stomata, 6.2.4 Translocation of sucrose, 6.2.5 Leaf structure for photosynthesis, 6.2.6 Environmental factors on water uptake, 6.2.7 Rate calculations for transpiration, and 6.2.8 Plant adaptations to extreme environments. Each one has a worked solution and a mark scheme showing where the marks go.