This question is about cells and transport - AQA - GCSE Biology - Question 1 - 2022 - Paper 1
Question 1
This question is about cells and transport.
Complete Table 1.
| Name of cell part | Function of cell part |
|-----------------------|--... show full transcript
Worked Solution & Example Answer:This question is about cells and transport - AQA - GCSE Biology - Question 1 - 2022 - Paper 1
Step 1
Complete Table 1.
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Answer
Name of cell part
Function of cell part
Nucleus
Contains genetic information
Mitochondria
(site of aerobic) respiration
Cell membrane
Controls the movement of substances into and out of the cell
Step 2
What is the function of chloroplasts?
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Answer
Chloroplasts are involved in photosynthesis, allowing plants to convert light energy into chemical energy in the form of glucose.
Step 3
Name one type of cell in a potato plant that does not contain chloroplasts.
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Root hair cells do not contain chloroplasts.
Step 4
What is the independent variable in the investigation?
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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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To make sure only the potato mass was measured.
Step 6
Calculate the percentage increase in mass of the potato piece.
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Percentage increase in mass = ((end mass - starting mass) / starting mass) × 100 = ((2.7 - 2.5) / 2.5) × 100 = 8%.
Step 7
Complete Figure 1.
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The x-axis should be labeled with concentration of salt solution (in mol/dm³) and have an appropriate scale. The data from Table 2 should be plotted with a curve or 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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Concentration = 0.31 - 0.33 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 cells / potato by osmosis because the solution in the cells / potato is less concentrated than outside.
