A student investigated the effect of different mineral solutions on the growth of barley seedlings. They set up three test tubes, each containing a seedling and a different solution.
The table below shows the results of their investigation.
| Seedling | Solution provided | Height at start in cm | Height after 10 days in cm |
|---|---|---|---|
| A | Complete nutrient solution | 1.5 | 6.5 |
| B | Distilled water (no minerals) | 1.5 | 2.5 |
| C | Solution lacking magnesium ions | 1.5 | 3.5 |
Explain the differences in the growth of seedling A compared to seedlings B and C.
