plumiAntioxidants and vitamin C: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 1.3.4 Antioxidants and vitamin C, 2019–2025, with mark schemes and examiner’s reports where available.
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All 28 questions on Antioxidants and vitamin C, as a list
- June 2024, AS Unit 3, Q3(a)(i) (2 marks): The percentage decrease in the vitamin C content of the fruit with no coating, over the 60-day period, was 43.75%. Calculate the difference in the percentage de
- June 2024, AS Unit 3, Q3(a)(iv) (3 marks): A coating made from a combination of chitosan and cinnamon oil was also tested. Describe an investigation to determine if this coating is more effective than th
- January 2024, AS Unit 3, Q1(a) (3 marks): Explain the link between dietary antioxidants and the risk of cardiovascular disease (CVD). (3)
- January 2024, AS Unit 3, Q1(b) (5 marks): The vitamin C content of the leaves from spinach plants was investigated. Describe how comparative measurements of the vitamin C content of the leaves from two
- October 2023, AS Unit 1, Q8(b)(i) (3 marks): Explain why eating these rhizomes may help to prevent CVD. (3)
- October 2023, Unit 6, Q1(a) (1 mark): A student found the vitamin C content of camu camu fruits changed with the length of time in storage. Freshly picked fruits had a mean vitamin C content of 2 40
- October 2023, Unit 6, Q1(b) (6 marks): The student read that ‘the vitamin C content of these fruits decreases the most during the first 14 days of storage.’ Describe an experiment to investigate the
- June 2023, AS Unit 1, Q6(d) (4 marks): Explain why dietary antioxidants are important. (4)
- June 2023, AS Unit 1, Q6(e)(i) (1 mark): The antioxidant activity of orange juice is 0.80 a.u. per 100 g. Calculate how many times more antioxidant activity there is in 100 g of grasshopper extract. Gi
- June 2023, AS Unit 1, Q6(e)(ii) (1 mark): Calculate the percentage difference between the antioxidant activity in black scorpions and crickets. (1) Answer %
- June 2023, AS Unit 1, Q6(e)(iii) (3 marks): Comment on the results of this investigation. Use the information in the table and the graph to support your answer. (3)
- October 2022, AS Unit 3, Q1(a) (3 marks): Explain how increasing the quantity of plant foods that contain vitamin C in the diet may protect against heart disease. (3)
- October 2022, AS Unit 3, Q1(b)(i) (5 marks): Describe a method to allow a quantitative comparison of the vitamin C content of two of these foods. (5)
- October 2022, AS Unit 3, Q1(c)(i) (2 marks): Calculate the rate of change of vitamin C content in oranges for the first 3 weeks of storage at 4 °C. Give your answer to 2 significant figures. (2) Answer g d
- October 2022, AS Unit 3, Q1(c)(ii) (4 marks): Comment on the effects of storage time and temperature on the vitamin C content of these juices. (4)
- June 2022, Unit 6, Q2(a) (6 marks): Describe an experiment to measure the vitamin C content of each type of fruit. (6)
- June 2022, Unit 6, Q2(b) (2 marks): The student found the vitamin C content of the fruits to be: kiwifruit 92.7 mg 100 g–1 guava fruit 223.3 mg 100 g–1 Calculate the percentage difference in vitam
- January 2022, AS Unit 1, Q7(b)(i) (3 marks): Explain why antioxidants in the diet reduce the risk of CVD. (3)
- October 2021, AS Unit 1, Q7(b)(ii) (3 marks): The antioxidant properties of altered HDL are reduced. Explain the effect that this has on reducing the risk of heart disease. (3)
- January 2021, AS Unit 1, Q7(c)(i) (3 marks): Explain how dietary antioxidants reduce the risk of CVD. (3)
- January 2020, AS Unit 3, Q1(a) (2 marks): Explain what is meant by this statement. (2)
- January 2020, AS Unit 3, Q1(b)(i) (2 marks): Explain what happens to DCPIP in the presence of vitamin C. (2)
- January 2020, AS Unit 3, Q1(b)(ii) (2 marks): In an investigation, a student compared the vitamin C concentration of freshly squeezed fruit juice and fruit juice stored in a carton. The table shows the resu
- January 2020, AS Unit 3, Q1(b)(iii) (2 marks): Calculate the concentration of vitamin C in lime juice from a carton as a percentage of fresh lime juice. (2) Answer %
- January 2020, AS Unit 3, Q1(b)(v) (3 marks): Comment on the vitamin C content of fresh juice compared with juice from a carton. (3)
- June 2019, AS Unit 1, Q6(a) (3 marks): Explain how dietary antioxidants reduce the risk of CVD. (3)
- June 2019, AS Unit 1, Q6(b)(i) (4 marks): Explain whether eating dark chocolate is likely to reduce the risk of CVD more than eating milk chocolate. Use the information in the table to support your answ
- June 2019, AS Unit 1, Q6(b)(ii) (1 mark): The table gives some information about ingredients in three different brands of milk chocolate and dark chocolate. Percentage of ingredient in Percentage of ing
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