A soft clamp is fitted around the stem of a sunflower. The clamp stops movement through the phloem but leaves the xylem working. All of the leaves are above the clamp and the roots are below it.
Which change in the stem will the clamp cause?
The amount of water will decrease above the clamp because water cannot move up past the clamp
The concentration of mineral ions will increase below the clamp because movement to the leaves is reduced
The concentration of dissolved sugars will increase below the clamp because phloem carries them upwards
The concentration of dissolved sugars will increase above the clamp because transport towards the roots is reduced
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.