GCSE AQA Biology Combined Science Cell Structure: A student investigated the effec

Question

A student investigated the effect of different concentrations of sugar solution on pieces of potato.

This is the method used.

1. Cut five pieces of potato.
2. Record the starting mass of each piece of potato.
3. Place each piece of potato in a different concentration of sugar solution.
4. After 24 hours remove the pieces of potato from the solutions.
5. Record the final mass of each piece of potato.
6. Calculate the change in mass for each piece of potato.

What is the independent variable?

Tick (*) one box.

Change in mass of the pieces of potato
Concentration of the sugar solution
Length of time the pieces of potato are in the solution
Starting mass of the pieces of potato

Table 1 shows the results.

Table 1

| Concentration of sugar solution in mol/dm² | Mass of potato at start in grams | Mass of potato after 24 hours in grams | Change in mass in grams |
|---------------------------------------------|------------------------------------|------------------------------------------|--------------------------|
| 0.0                                         | 7.94                               | 10.14                                    | 2.20                     |
| 0.1                                         | 7.95                               | 9.10                                     | 1.15                     |
| 0.2                                         | 7.96                               | 8.21                                     | 0.25                     |
| 0.3                                         | 7.93                               | 7.53                                     | -0.40                    |
| 0.4                                         | 7.93                               | 7.18                                     | -0.75                    |
| 0.5                                         | 7.95                               | 7.00                                     | -0.95                    |

Explain why the potato in 0.0 mol/dm² sugar solution increased in mass.

Complete Figure 1.

Some of the results have been plotted for you.
You should:
- plot the data from Table 1
- draw a line of best fit through all the points.

The mass of a piece of potato does not change when:

concentration of solution inside cells = concentration of solution outside cells.

Determine the concentration of sugar solution inside the potato cells.

Calculate the percentage change in mass for the potato in 0.2 mol/dm² sugar solution.

Use Table 1.

Use the equation:

percentage change in mass = $ \frac{\text{change in mass}}{\text{mass of potato at start}} \times 100 $

Give your answer to 3 significant figures.

A student investigated the effect of different concentrations of sugar solution on pieces of potato - AQA - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1

Worked Solution & Example Answer:A student investigated the effect of different concentrations of sugar solution on pieces of potato - AQA - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1

What is the independent variable?

Explain why the potato in 0.0 mol/dm² sugar solution increased in mass.

Complete Figure 1.

Determine the concentration of sugar solution inside the potato cells.

Calculate the percentage change in mass for the potato in 0.2 mol/dm² sugar solution.

Join the GCSE students using SimpleStudy...