AQA A LEVEL BIOLOGY 7402/2 Paper 2 June 2025 Actual
Exam 2026/2027 | Complete Exam-Style Questions with
Detailed Rationales | Pass Guaranteed – A+ Graded
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.
● You must answer the questions in the spaces provided.
● Do all rough work in this book. Cross through any work you do not want to be
marked.
● Show all your working.
Information
● The marks for questions are shown in brackets.
● The maximum mark for this paper is 91.
● You are expected to use a calculator where appropriate.
● You will be marked on your ability to:
○ use good English
○ organise information clearly
○ use specialist vocabulary where appropriate.
SECTION A: Short-answer and Structured Questions
Question 1 (9 marks) – Respiration
, 1.1 The diagram shows the link reaction and the Krebs cycle. Complete the table by
identifying the missing substances labelled 1–4.
Table
Number Substance
1
2
3
4
[4 marks]
1.2 Explain why the link reaction and Krebs cycle occur twice per molecule of glucose.
[2 marks]
1.3 In the final stage of aerobic respiration, oxygen acts as the final electron acceptor.
Explain why a decrease in oxygen uptake would result in a decrease in ATP production.
[3 marks]
Question 2 (10 marks) – Homeostasis and the Nervous System
2.1 Define the term homeostasis.
Exam 2026/2027 | Complete Exam-Style Questions with
Detailed Rationales | Pass Guaranteed – A+ Graded
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.
● You must answer the questions in the spaces provided.
● Do all rough work in this book. Cross through any work you do not want to be
marked.
● Show all your working.
Information
● The marks for questions are shown in brackets.
● The maximum mark for this paper is 91.
● You are expected to use a calculator where appropriate.
● You will be marked on your ability to:
○ use good English
○ organise information clearly
○ use specialist vocabulary where appropriate.
SECTION A: Short-answer and Structured Questions
Question 1 (9 marks) – Respiration
, 1.1 The diagram shows the link reaction and the Krebs cycle. Complete the table by
identifying the missing substances labelled 1–4.
Table
Number Substance
1
2
3
4
[4 marks]
1.2 Explain why the link reaction and Krebs cycle occur twice per molecule of glucose.
[2 marks]
1.3 In the final stage of aerobic respiration, oxygen acts as the final electron acceptor.
Explain why a decrease in oxygen uptake would result in a decrease in ATP production.
[3 marks]
Question 2 (10 marks) – Homeostasis and the Nervous System
2.1 Define the term homeostasis.
