Some farmland near the coast was flooded by seawater. After the flood, the soil water had a higher concentration of salt than the cytoplasm of the root hair cells of the crop plants.
Explain why the crop plants growing in this soil wilted.
When plants start to wilt, their stomata close.
Explain one advantage and one disadvantage to the plant of closing its stomata.
The concentration of potassium ions in the soil is lower than the concentration of potassium ions inside the root hair cells.
Explain how the root hair cells can still absorb potassium ions.
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.