A student investigated the water potential of sweet potato tissue. They cut a cylinder of sweet potato, recorded its initial mass, and immersed it in a 0.8 mol dm-3 sucrose solution. After 24 hours, they gently blotted the cylinder dry and recorded its final mass. The results are shown in the table below:
| Mass of sweet potato cylinder before (g) | Mass of sweet potato cylinder after (g) |
|---|---|
| 8.2 | 7.1 |
What is the percentage change in mass of the sweet potato cylinder to 3 significant figures?
−1.1%-1.1\%−1.1%
−13.4%-13.4\%−13.4%
−15.5%-15.5\%−15.5%
−86.6%-86.6\%−86.6%
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.