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Exam (elaborations)

Jan 2025 Unit 6 Exam Paper | Verified Questions & Mark Scheme | A Level Revision

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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 23 January 2025
Afternoon (Time: 1 hour 20 minutes) Paper
reference WBI16/01
Biology  


International Advanced Level
UNIT 6: Practical Skills in Biology II


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.
Try to answer every question.
• Check your answers if you have time at the end.

Turn over


P78390A
©2025 Pearson Education Ltd.
H:1/1/1/1/
*P78390A0120*

, Answer ALL questions.

1 The photograph shows a brine shrimp that is found in salt lakes in North America.




DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(Source: © Nature Picture Library / Alamy Stock Photo)

These brine shrimps hatch from eggs and feed on algae.
Some salt lakes contain copper ions from industrial activity. The concentration of
copper ions is increasing, as the lakes are drying out.
A student hypothesised that an increasing concentration of copper ions may affect
the time taken for the brine shrimps to hatch from the eggs.
(a) Describe an experiment to investigate the effect of the concentration of
copper ions on the time taken for the brine shrimps to hatch from eggs.
(6)

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2
*P78390A0220* 

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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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(b) Suggest why using brine shrimps in this investigation does not create any
ethical concerns.
(1)

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3



 *P78390A0320* Turn over
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