Complete Table 1.
Table 1
Name of cell part
Function of cell part
Mitochondria
Contains genetic information
Controls the movement of substances into and out o... show full transcript
Worked Solution & Example Answer:Complete Table 1 - AQA - GCSE Biology - Question 1 - 2022 - Paper 1
Step 1
Complete Table 1.
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Answer
Nucleus - Contains genetic information.
Mitochondria - Site of aerobic respiration (release of energy).
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
The function of chloroplasts is to carry out photosynthesis, converting 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 cell.
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 ensure that only the mass of the potato itself was measured without the excess water or solution affecting the result.
Step 6
Calculate the percentage increase in mass of the potato piece.
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Starting mass = 2.5 g, End mass = 2.7 g.
Increase in mass = 2.7 g - 2.5 g = 0.2 g.
Percentage increase in mass = ( \frac{0.2}{2.5} \times 100 = 8% )
Step 7
Complete Figure 1.
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Label the x-axis as 'Concentration of Salt Solution (mol/dm³)'. Ensure the scale is appropriate and the data from Table 2 is correctly plotted, with a curve drawn 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 can be identified by referring to the graph in Figure 1 and is approximately 0.3 - 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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The potato pieces lost mass because water moves out of the cells by osmosis, as the solution outside the potato is more concentrated than the solution inside the cells.
