From Paper 2: Advanced Physiology, Evolution and Ecology
1(a)4 marks
Explain why fetal haemoglobin has a higher affinity for oxygen than adult haemoglobin, and why this is important.
From Paper 2: Advanced Physiology, Evolution and Ecology
1(b)4 marks
Describe the events of the cardiac cycle, including the role of the valves.
From Paper 2: Advanced Physiology, Evolution and Ecology
1(c)4 marks
Describe the clotting cascade.
From Paper 2: Advanced Physiology, Evolution and Ecology
10*6 marks
Explain how the structure of the alveoli and the control of breathing allow gas exchange to keep pace with demand during exercise.
From Paper 3: General and Practical Principles in Biology
2(c)3 marks
Suggest why shade leaves have a larger surface area.
From Paper 3: General and Practical Principles in Biology
4(a)4 marks
A student measured the heart rate of 10 volunteers before and after drinking caffeinated coffee. Describe how the investigation could be improved to give valid results.
From Paper 3: General and Practical Principles in Biology
4(c)4 marks
Mean heart rate rose from 68 to 80 beats per minute after the coffee. Calculate the percentage increase and explain how caffeine could cause this effect.
From Paper 3: General and Practical Principles in Biology
5(a)4 marks
Describe how you would use a dissected mammalian heart to compare the thickness of the left and right ventricle walls, and explain the difference you would expect.
From Paper 3: General and Practical Principles in Biology
5(b)4 marks
Describe how you would determine the water potential of potato tissue.
Score 0 / 37 · 0 of 9 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Biology exam. It is not a past paper and is not produced or endorsed by the exam board.
Exchange and transport Exam Questions: Edexcel A-Level Biology | Plasmo