This question is about cells and transport - AQA - GCSE Biology - Question 7 - 2010 - Paper 1
Question 7
This question is about cells and transport.
Complete Table 5.
What is the function of chloroplasts?
Name one type of cell in a potato plant that does not contain ... show full transcript
Worked Solution & Example Answer:This question is about cells and transport - AQA - GCSE Biology - Question 7 - 2010 - Paper 1
Step 1
Complete Table 5.
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Answer
Nucleus
(Site of) aerobic respiration / releases energy / makes ATP
(Cell) membrane
Step 2
What is the function of chloroplasts?
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Answer
The main function of chloroplasts is photosynthesis, where they 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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Answer
One type of cell in a potato plant that does not contain chloroplasts is a root cell.
Step 4
What is the independent variable in the investigation?
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Answer
The independent variable in the investigation 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 of each potato piece to ensure that only the mass of the potato itself was measured, without any excess water or solution affecting the results.
Step 6
Calculate the percentage increase in mass of the potato piece.
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Answer
To calculate the percentage increase in mass, use the formula:
ext{percentage increase in mass} = rac{ ext{increase in mass}}{ ext{starting mass}} imes 100
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Answer
Label the x-axis as 'Concentration of salt solution (mol/dm³)'.
Use a suitable scale that covers the data range effectively, ensuring that it takes up at least 50% of the graph area.
Plot the points from Table 6 and draw a smooth line of best fit that represents the trend of the data.
Step 8
What concentration of salt solution was equal to the concentration of the solution inside the potato pieces?
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Answer
Based on Figure 9, the concentration of salt solution that was equal to the concentration of the solution inside the potato pieces is approximately 0.2 mol/dm³.
Step 9
Explain why the potato pieces in the 0.4 mol/dm³ salt solution decreased in mass.
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The potato pieces in the 0.4 mol/dm³ salt solution decreased in mass because water moved out of the potato cells by osmosis. In the higher concentration solution, the water concentration inside the potato cells was greater than outside, causing water to diffuse out to the less concentrated solution outside, leading to a decrease in mass.
