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Pearson Edexcel A-Level Biology Advanced UNIT 6: Practical Biology and Investigative Skills January 2024 Authentic Marking Scheme Attached
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Pearson Edexcel A-Level Biology Advanced UNIT 6: Practical Biology and Investigative Skills January 2024 Authentic Marking Scheme Attached

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  • April 13, 2024
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Please check the examination details below before entering your candidate information
Candidate surname Other names


Centre Number Candidate Number




Pearson Edexcel International Advanced Level
Tuesday 23 January 2024
Morning (Time: 1 hour 20 minutes) Paper
reference WBI16/01
Biology  


Advanced
UNIT 6: Practical Biology and Investigative Skills

You must have: Total Marks
Scientific calculator, ruler, HB pencil



Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.

Information
•• The total mark for this paper is 50.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.

Advice
•• Read each question carefully before you start to answer it.
Keep an eye on the time.
•• Try to answer every question.
Check your answers if you have time at the end.




Turn over


P73454A
©2024 Pearson Education Ltd.
S:1/1/1/1/
*P73454A0120*

, Answer ALL questions.
1 The photograph shows parts of Tussilago farfara. This is a native species of plant that




DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
grows in North Africa and Central Asia.




© Zoonar GmbH / Alamy Stock Photo

This plant can be used as a medicine.
(a) Describe how the antibacterial activity of different parts of this plant could
be compared.
(6)

. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .



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2
*P73454A0220* 

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. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA




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. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .



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(b) Scientists have isolated antibacterial compounds from plants such as
Tussilago farfara.
(i) State what is meant by the terms bacteriostatic and bactericidal antibiotics.
(2)

. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .



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(ii) Explain how the code of practice for prescribing antibiotics helps to
control infections.
(2)

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. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .


(Total for Question 1 = 10 marks)

3
 *P73454A0320* Turn over

, 2 The photograph shows a pollen tube growing in a culture medium on a glass slide.




DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
© Garry Delong / Science Photo Library

Pollen grains were placed on glass slides covered in growth medium.
Eight slides were incubated at 24 °C.
After one hour, one slide was placed under a microscope and the lengths of 10 pollen
tubes were measured.
The measurements were repeated at hourly intervals with the remaining seven slides.
The graph shows the results.




4



*P73454A0420* 

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