Pearson Edexcel International Advanced Level WBI15/01 Biology International Advanced Level UNIT 5: Respiration, Internal Environment, Coordination and Gene Technology October 2024 + mark scheme

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Centre Number Candidate Number




Pearson Edexcel International Advanced Level
Thursday 24 October 2024
Morning (Time: 1 hour 45 minutes) Paper
reference WBI15/01
Biology  


International Advanced Level
UNIT 5: Respiration, Internal Environment,
Coordination and Gene Technology

You must have: Total Marks
Scientific article (enclosed), 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
– use this as a guide as to how much time to spend on each question.
• Instructure
questions labelled with an asterisk (*), marks will be awarded for your ability to
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.
• Check your answers if you have time at the end.
Turn over


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V:1/1/1/1/1/
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, Answer ALL questions.
Write your answers in the spaces provided.




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Some questions must be answered with a cross in a box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
1 Neurones transmit impulses between receptors and effectors.
The diagram shows a neurone.




(a) Draw an arrow on the diagram to show the direction of a nerve impulse.
(1)




(b) Nerve impulses travel along axons due to changes in membrane potentials.
The graph shows an action potential in a neurone.

70
V
50

30

10
Membrane
potential –10
/ mV W
–30 U
X
–50

–70

–90
0 1 2 3 4 5 6
Time / ms




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, (i) Which is the resting potential for this neurone?
(1)
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A –90 mV

B –70 mV

C +48 mV

D +70 mV

(ii) Which letter on the graph shows where the neurone is hyperpolarised?
(1)

A U

B V

C W

D X

(iii) Which is the difference in membrane potential between points V and W on
the graph?
(1)
A 40 mV

B 50 mV

C 90 mV

D 140 mV




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, (c) Give two differences between the functions of a motor neurone and a
sensory neurone.
(2)




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(Total for Question 1 = 6 marks)




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