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
Component
Function
Nucleus
Site of aerobic respiration
(Site of) aerobic respiration
Produces/makes ATP or releases energy
Cell membrane
Regulates what enters and leaves the cell
Step 2
What is the function of chloroplasts?
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Answer
The function of chloroplasts is to carry out photosynthesis, allowing the plant to absorb sunlight and convert it into glucose and oxygen.
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 hair 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 was measured. If any excess water or solution was left on the potato, it would affect the mass and the results of the investigation.
Step 6
Calculate the percentage increase in mass of the potato piece.
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To calculate the percentage increase in mass of the potato piece, use the formula:
ext{percentage increase in mass} = rac{ ext{increase in mass}}{ ext{starting mass}} imes 100
First, calculate the increase in mass:
Increase in mass = End mass - Starting mass = 2.7 g - 2.5 g = 0.2 g
Now, substituting into the formula:
ext{percentage increase in mass} = rac{0.2}{2.5} imes 100 = 8\%
Step 7
Complete Figure 9.
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Answer
To complete Figure 9, label the x-axis as 'Concentration of salt solution (mol/dm³)', ensure the scale is suitable and covers at least 50% of the grid, plot the data from Table 6 accurately, and draw a smooth line of best fit through the points.
Step 8
What concentration of salt solution was equal to the concentration of the solution inside the potato pieces?
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Answer
The concentration of salt solution equal to the concentration of the solution inside the potato pieces is approximately 0.3 mol/dm³, based on the data represented in Figure 9.
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 moves out of the potato cells by osmosis. In this case, the concentration of the salt solution outside the cells is higher than that inside, causing water to flow out to balance the concentration, resulting in a loss of mass.
