Which feature of the lungs maintains a steep concentration gradient for oxygen?
From Paper 1: Biological processes
81 mark
Which vessel carries blood at the highest pressure?
From Paper 1: Biological processes
91 mark
Which of these increases the rate of transpiration?
From Paper 1: Biological processes
19(a)4 marks
Describe the mechanism of inspiration in a mammal.
From Paper 1: Biological processes
19(b)4 marks
A spirometer trace showed 18 breaths in 1 minute, each with a tidal volume of 0.45 dm³. The oxygen chamber volume fell by 1.2 dm³ in 3 minutes.
Calculate the ventilation rate and the rate of oxygen uptake.
From Paper 1: Biological processes
20(a)5 marks
Explain how sucrose is transported from a leaf to a root by translocation.
From Paper 1: Biological processes
20(b)3 marks
Describe three adaptations of marram grass that reduce water loss.
From Paper 1: Biological processes
26(a)5 marks
Describe how the electrical activity of the heart coordinates the cardiac cycle.
From Paper 3: Unified biology
2(a)5 marks
Explain how the movement of water through a plant depends on water potential gradients.
From Paper 3: Unified biology
4(a)4 marks
Explain how the structure of capillaries and the formation of tissue fluid allow cells in a muscle to receive glucose during exercise.
From Paper 3: Unified biology
6*9 marks
Discuss how the structure of proteins is related to their functions in living organisms. Use examples from different areas of biology.
Score 0 / 42 · 0 of 11 marked
This paper is written by Plasmo in the style of the OCR 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: OCR A-Level Biology | Plasmo