A student increases the temperature around a well-watered shoot from 18 ∘C18\,^\circ\text{C}18∘C to 28 ∘C28\,^\circ\text{C}28∘C. Light intensity, air movement and relative humidity are controlled. Stomatal opening does not change.
Which explanation accounts for an increased rate of water uptake?
Faster evaporation from mesophyll surfaces increases water loss and xylem flow.
Faster translocation from mesophyll surfaces decreases water loss and xylem flow.
Faster translocation from mesophyll surfaces increases water loss and xylem flow.
Faster evaporation from mesophyll surfaces decreases water loss and xylem flow.
80 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.