A-Level AQA Biology Respiration (A Level only): Other than those stated, suggest

Question

Other than those stated, suggest two variables the student needed to keep constant in her investigation.

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2

Figure 3 shows the result she obtained for yeast in glucose solution.

Figure 3

Bubble containing carbon dioxide produced

Use Figure 2 and Figure 3 to calculate the rate of carbon dioxide production in mm s⁻¹ for yeast in glucose solution.

Give your answer in standard form and to 2 significant figures.

Show your working.

Answer __________________ mm s⁻¹

The student repeated the experiment using yeast in maltose solution. She found the rate of carbon dioxide production was slower than yeast in glucose solution. Suggest.

A second student used a different method to investigate the effect of different sugars on the rate of respiration in yeast.

He set up a tube with yeast in glucose solution and added bromothymol blue. Bromothymol blue changes from blue to yellow when carbon dioxide is produced.

Suggest:

• why the method the second student used would be less accurate than the method the first student used
• how the accuracy of the method the second student used could be improved.

This method would be less accurate because.

Complete the boxes A to D in Figure 4 to show the link reaction.

Figure 4

Other than those stated, suggest two variables the student needed to keep constant in her investigation - AQA - A-Level Biology - Question 2 - 2023 - Paper 3

Worked Solution & Example Answer:Other than those stated, suggest two variables the student needed to keep constant in her investigation - AQA - A-Level Biology - Question 2 - 2023 - Paper 3

Suggest two variables the student needed to keep constant.

Use Figure 2 and Figure 3 to calculate the rate of carbon dioxide production in mm s⁻¹ for yeast in glucose solution.

Suggest why the method the second student used would be less accurate than the method the first student used.

Suggest how the accuracy of the method the second student used could be improved.

Complete the boxes A to D in Figure 4 to show the link reaction.

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