A plant has an underground storage organ that is breaking down its carbohydrate store into soluble sugar. Roots below the storage organ are growing. Higher up the stem, a mature leaf is photosynthesising, and the shoot tip above this leaf is growing.
Explain how sucrose moves from the storage organ to the growing roots, and explain whether sucrose could move upwards from the mature leaf to the shoot tip at the same time.
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.