Complete Table 5 - AQA - GCSE Biology - Question 7 - 2010 - Paper 1

Chloroplasts are responsible for photosynthesis, allowing plants to convert sunlight into glucose.

One type of cell in a potato plant that does not contain chloroplasts is the root hair cell.

The independent variable in the investigation is the concentration of salt solution.

The student dried the surface to ensure that only the potato mass was measured and that excess water did not affect the mass.

The increase in mass is calculated as follows:

Increase in mass = final mass - initial mass = 2.7 g - 2.5 g = 0.2 g.

Using the formula:

$\text{percentage increase in mass} = \frac{0.2 \, g}{2.5 \, g} \times 100 = 8\%$

In Figure 9, label the x-axis as 'Concentration of salt solution (mol/dm³)', ensure the scale is appropriate to accommodate all data from Table 6, and plot all points accurately. Finally, draw a line of best fit that appropriately represents the data.

The concentration that was equal to that inside the potato pieces can be determined from Figure 9, typically around 0.3 - 0.31 mol/dm³.

The potato pieces in the 0.4 mol/dm³ salt solution decreased in mass due to osmosis. Water moves out of the potato cells where the concentration of solute (salt) is higher outside the cells than inside, leading to a loss of mass.