Complete Table 5.
Table 5
| Name of cell part | Function of cell part |
|-------------------|-----------------------|
| | Contains genetic inform... show full transcript
Worked Solution & Example Answer:Complete Table 5 - AQA - GCSE Biology - Question 7 - 2010 - Paper 1
Step 1
Complete Table 5.
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Answer
| Nucleus | Contains genetic information |
| Mitochondria | Produces ATP / releases energy |
| Cell membrane | Controls the movement of substances in and out of the cell |
Step 2
What is the function of chloroplasts?
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Answer
The function of chloroplasts is to conduct photosynthesis, allowing the plant to produce glucose and other organic molecules using sunlight.
Step 3
Name one type of cell in a potato plant that does not contain chloroplasts.
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Answer
Sclerenchyma cell.
Step 4
What is the independent variable in the investigation?
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The independent variable is the concentration of salt solution.
Step 5
Why did the student dry the surface of each potato piece with a paper towel in step 5?
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The student dried the surface to make sure only the potato mass was measured, avoiding the effect of excess water or liquid on the mass.
Step 6
Calculate the percentage increase in mass of the potato piece.
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To calculate the percentage increase in mass, use the formula:
percentageincreaseinmass=2.5g2.7g−2.5g×100
This simplifies to:
percentageincreaseinmass=2.5g0.2g×100=8%.
Step 7
Complete Figure 9.
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Answer
Label the x-axis as "Concentration of salt solution (mol/dm³)". Ensure the scale covers at least 50% of the grid and plot the data accurately. Draw a smooth curve as the line of best fit.
Step 8
What concentration of salt solution was equal to the concentration of the solution inside the potato pieces?
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The concentration is determined from Figure 9, which indicates a concentration of approximately 0.3 mol/dm³.
Step 9
Explain why the potato pieces in the 0.4 mol/dm³ salt solution decreased in mass.
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Water moves out of the potato cells by osmosis because the concentration of the salt solution (0.4 mol/dm³) is higher than the concentration of the solution inside the potato cells, leading to a decrease in mass.
