plumiTensile strength of plant fibres: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 4.2.4 Tensile strength of plant fibres, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(b)(i)
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All 14 questions on Tensile strength of plant fibres, as a list
- January 2025, AS Unit 3, Q1(b)(i) (1 mark): State what is meant by the term tensile strength. (1)
- January 2025, AS Unit 3, Q1(b)(ii) (4 marks): Describe how to investigate the relationship between the length of these fibres and their tensile strength. (4)
- January 2025, AS Unit 3, Q1(d)(i) (1 mark): State the relationship represented by the gradient. (1)
- January 2025, AS Unit 3, Q1(d)(ii) (3 marks): Suggest how differences in the structure of these three fibres could affect their tensile strength. Use the information in the graph, the drawing and the table
- October 2024, Unit 6, Q2(b) (3 marks): The table shows the results of this investigation. Force needed to break a fibre treated Force needed to break an untreated fibre with hydrogen peroxide / MPa /
- June 2023, AS Unit 3, Q1(b)(ii) (3 marks): After soaking, the diameter of each fibre was measured. Describe how fibre diameter could be measured accurately using a microscope. (3)
- June 2023, AS Unit 3, Q1(b)(iii) (2 marks): Give two reasons why fibre diameter was measured. (2) 1 2
- June 2023, AS Unit 3, Q1(c)(ii) (3 marks): Describe the results of this investigation. (3)
- January 2022, AS Unit 3, Q2(b)(i) (4 marks): Describe how you could use this apparatus to make a valid comparison of the tensile strength of fibres with different diameters. (4)
- January 2022, AS Unit 3, Q2(b)(iii) (3 marks): Describe the relationship between the diameter and the tensile strength of these fibres. (3)
- January 2022, Unit 6, Q1(a) (6 marks): Describe an experiment to measure the tensile strength of fibres that have been extracted from these plants. (6)
- January 2020, AS Unit 3, Q2(a) (4 marks): Describe a valid method that could be used to compare the breaking force of these fibres. (4)
- January 2020, AS Unit 3, Q2(b)(i) (5 marks): Devise a method to determine the cross-sectional area of a fibre, using the following equipment: • a sharp blade • a microscope • a microscope slide and coversl
- January 2020, AS Unit 3, Q2(b)(iii) (3 marks): The breaking force of a jute fibre is 1.08 newtons. Calculate the cross-sectional area of a jute fibre, using the information in the graph and the following for
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