Which row in the table is the correct description for the transpiration stream?
| Structure involved | Substance(s) transported | Direction of movement | |
|---|---|---|---|
| A | xylem | water and mineral ions | upwards only |
| B | xylem | sucrose and amino acids | upwards and downwards |
| C | phloem | water and mineral ions | upwards only |
| D | phloem | sucrose and amino acids | upwards and downwards |
Row A
Row B
Row C
Row D
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.