Equal-sized strips of celery stalk were placed in sodium chloride solutions for two hours. Each strip was blotted before its final mass was measured. The same force was then applied to the middle of each strip, and the distance it bent was recorded.
| Sodium chloride concentration (mol dm−3\text{mol dm}^{-3}mol dm−3) | Initial mass (g) | Final mass (g) | Distance bent (mm) |
|---|---|---|---|
| 0.00 | 8.00 | 8.60 | 3 |
| 0.30 | 8.10 | 7.90 | 9 |
| 0.60 | 8.00 | 7.00 | 18 |
Explain the pattern in the mass of the celery strips and the distance they bent as the sodium chloride concentration increased.
Explain why the mass of the strip in the 0.00 mol dm-3 solution would eventually stop increasing if it were left in the solution for longer.
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.