plumiRoot tip squash and mitotic index: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 3.4.2 Root tip squash and mitotic index, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(c)(i)
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All 25 questions on Root tip squash and mitotic index, as a list
- June 2025, AS Unit 3, Q1(c)(i) (4 marks): Describe how a root sample could have been prepared and examined to obtain these results. (4)
- June 2025, AS Unit 3, Q1(c)(ii) (2 marks): There were 98 cells seen in total in the samples from the seedlings in the solvent with trifluralin. Calculate how many cells were at stage 2 in the samples fro
- January 2025, AS Unit 2, Q4(d) (1 mark): State how the mitotic index of a tissue could be calculated. (1)
- June 2024, AS Unit 2, Q2(b) (2 marks): The mitotic index of a tissue was calculated. The tissue had 450 cells in mitosis and the mitotic index was 37.5%. Calculate the number of cells in this tissue
- January 2024, AS Unit 2, Q7(b)(i) (1 mark): This sample was stained before being viewed using a microscope. State why the cells in this sample were stained before being viewed using a microscope, in order
- January 2024, AS Unit 2, Q7(b)(ii) (2 marks): Describe how the mitotic index of the tissue sample would be determined. (2)
- October 2023, AS Unit 2, Q7(c)(i) (2 marks): Two thousand OVCAR8 cells were studied. Calculate how many OVCAR8 cells were in interphase. (2) Answer
- October 2023, AS Unit 2, Q7(c)(ii) (1 mark): Which cancer cell culture has the highest proportion of cells undergoing nuclear division? (1) A HOC8 B OVCAR5 C OVCAR8 D SKOV3
- October 2023, AS Unit 3, Q3(b)(ii) (5 marks): Describe a suitable and safe procedure to obtain all the data shown in the graph. (5)
- October 2023, AS Unit 3, Q3(b)(iv) (2 marks): In control group cells 14.0 % are in mitosis. Calculate the percentage of cells in mitosis in those treated with lectin. (2) Answer %
- October 2023, AS Unit 3, Q3(b)(v) (2 marks): Comment on the conclusion that these results show that lectin does stimulate mitosis. Use the information in the graph and your answer to (b)(iv) to support you
- June 2023, AS Unit 2, Q4(b) (1 mark): Structure A contained 60 cells. The mitotic index of cells from structure A was calculated as 15%. Calculate the number of cells in structure A which were in mi
- June 2023, Unit 6, Q1(b)(i) (6 marks): Describe an experiment to measure the mitotic index of cells from onion roots treated with different concentrations of caffeine solution. (6)
- January 2023, AS Unit 2, Q4(b)(ii) (1 mark): State how the blastocyst cell was treated to show the stage of mitosis. (1)
- October 2022, AS Unit 2, Q8(d) (6 marks): Paclitaxel is a drug used to treat some tumours. In one study, the effect of paclitaxel on the cell cycle in human lung tumours was investigated. The table show
- June 2022, AS Unit 3, Q2(a) (5 marks): Describe a safe method to observe the stages of mitosis in these roots. (5)
- June 2022, AS Unit 3, Q2(b) (2 marks): The photograph shows part of a root tip from this investigation. (Source: © Rattiya Thongdumhyu/shutterstock) Calculate the mitotic index of this root tip. Give
- January 2022, AS Unit 2, Q4(c) (2 marks): The photograph shows a section through a root tip, as seen using a microscope. (Source: © agefotostock / Alamy Stock Photo) Describe how to determine the mitoti
- June 2021, AS Unit 3, Q2(b)(i) (4 marks): Describe how the mitotic index of roots can be determined. (4)
- June 2021, AS Unit 3, Q2(b)(ii) (3 marks): Seeds can be treated to artificially age them. In an investigation, untreated and treated samples of seeds were germinated and the roots allowed to grow. Roots
- June 2021, AS Unit 3, Q2(b)(iv) (3 marks): Identify the conclusions that can be drawn from these data. (3)
- October 2020, AS Unit 2, Q5(a)(ii) (3 marks): Using the data in the table, determine the stages of cancer in patients P and R. (3)
- January 2020, AS Unit 2, Q4(a)(i) (1 mark): Give one reason why the cells were stained in this investigation. (1)
- January 2020, AS Unit 2, Q4(a)(ii) (1 mark): The photograph shows these cells, as seen using a light microscope. Q R P S (Source: © Steve Gschmeissner/Science Photo Library) Which labelled cell is in the m
- January 2020, AS Unit 2, Q4(a)(iii) (2 marks): The table shows the results of this investigation. Stage Number of cells Interphase 117 Prophase 15 Metaphase 3 Anaphase 10 Telophase 5 Calculate the mitotic in
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