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*jun25 7402301* IB/M/Jun25/G4007/V7 7402/3
For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL
Wednesday 18 June 2025 Morning Time allowed: 2 hours
Materials
For this paper you must have:
• a ruler with millimetre measurements • a scientific calculator.
Instructions • Use black ink or black ball-point pen.• Fill in the boxes at the top of this page.• Answer all questions in Section A.• Answer one question from Section B.• You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages.• If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s).• Show all your working.• Do all rough work in this book. Cross through any work you do not want to be marked.
Information • The marks for the questions are shown in brackets.• The maximum mark for this paper is 78.
Please write clearly in block capitals.Centre number
Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.A-level
BIOLOGY
Paper 3 1 / 4
2
*02* IB/M/Jun25/ 7402/3
Do not write outside the box
There are no questions printed on this page
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
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*03* Turn over ►
IB/M/Jun25/7402/3
Do not write outside the box Section A
Answer all questions in this section.
You are advised to spend no more than 1 hour and 15 minutes on this section.
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. 1 Describe binary fission in bacteria.[3 marks]
Question 1 continues on the next page
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*04* IB/M/Jun25/ 7402/3
Do not write outside the box
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. 2
Microbiologists investigated the effect of two temperatures on the population growth of a species of bacterium.
They grew separate bacterial cultures in identical nutrient media at 20 °C and 24 ° C for 8 hours.
Figure 1 shows the estimated final population size of each culture.
Figure 1
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