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Pearson Edexcel International Advanced Level International Advanced Subsidiary / Advanced Level UNIT 4: Energy, Environment, Microbiology and Immunity QP January 2024

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Pearson Edexcel International Advanced Level International Advanced Subsidiary / Advanced Level UNIT 4: Energy, Environment, Microbiology and Immunity QP January 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
Thursday 11 January 2024
Morning (Time: 1 hour 45 minutes) Paper
reference WBI14/01
Biology ⯁ ⯁


International Advanced Subsidiary / Advanced Level
UNIT 4: Energy, Environment, Microbiology
and Immunity

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 90.
The marks for each question are shown in brackets

• Questions
– use this as a guide as to how much time to spend on each question.
labelled with an asterisk (*) marks will be awarded for your ability to
structure your answer logically, showing how the points that you make are related
or follow on from each other where appropriate.

Advice
• Read each question carefully before you start to answer it.
• Try to answer every question.
• your answers if you have time at the end.
Check
Pearson Edexcel International Advanced Level International Advanced Subsidiary / Advanced Level UNIT 4:
Energy, Environment, Microbiology and Immunity QP January 2024 Turn over


P73452A
©2024 Pearson Education Ltd.
S:1/1/1/1/

, Answer ALL questions. Write your answers in the spaces provided.

Some questions must be answered with a cross in a box . If you change your mind about an




DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 Skin flora provide a barrier, protecting the body from infection by bacteria.

(a) Which of the following also act as barriers, protecting the body from infection
by bacteria?
(1)
A antigens and stomach acid

B antigens and interferon

C interferon and skin
D skin and stomach acid


(b) The diagrams show the effects of different methods of washing hands on
skin flora.




DO NOT WRITE IN THIS AREA
The dark areas show the presence of microorganisms and the light areas show
clean areas.

1. before washing 2. “rinse and shake” 3. six seconds, no soap




4. six seconds with soap 5. fifteen seconds with soap 6. thirty seconds with soap
DO NOT WRITE IN THIS AREA




2
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, (i) Describe two conclusions that can be made about the different methods of
washing hands.
(2)
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(ii) Explain the differences in the effects that these methods of washing hands
have on the skin flora.
(2)

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(Total for Question 1 = 5 marks)
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3
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