A nursery investigates the use of tissue culture to produce plants for sale.
Small groups of cells from one parent plant are placed on growth media containing different concentrations of auxin. At each concentration, 40 groups of cells are used.
The table shows the results after six weeks.
| Auxin concentration in mg dm⁻³ | Number of groups that developed into plantlets |
|---|---|
| 0.0 | 5 |
| 0.8 | 34 |
| 1.6 | 26 |
Calculate the percentage of the groups of cells that developed into plantlets at an auxin concentration of 0.8 mg dm⁻³.
Explain why the nursery chose an auxin concentration of 0.8 mg dm⁻³ and why tissue culture is suitable for producing plants for sale.
87 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.