Oxford Cambridge and RSA - 2025
Thursday 22 May 2025 – Morning
AS Level Biology B (Advancing Biology)
H022/02 Biology in depth
Time allowed: 1 hour 30 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
, INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra
space use the lined pages at the end of this booklet. The question numbers
must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working.
Marks might be given for a correct method, even if your answer is
wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an
asterisk (*).
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025
OCR is an exempt
[601/4721/0] DC
Charity Turn over
(LK/CB) 329634/3
, 2
1
(a) The mammalian circulatory system is described as a closed double circulatory system.
(i) Explain what is meant by a closed circulatory system.
..............................................................................................................................................
............
.................................................................................................................................. [1]
(ii) The diagram below shows the circulatory system of a frog.
Capillaries in the lungs and skin
right left
side side
Capillaries in the muscles
Blood leaving the heart of a frog is less oxygenated than blood leaving the heart of a
mammal.
Explain why blood leaving the heart of a frog is less oxygenated than blood leaving the
heart of a mammal.
..............................................................................................................................................
............
..............................................................................................................................................
............
..............................................................................................................................................
............
..............................................................................................................................................
............
.................................................................................................................................. [2]
© OCR
2025
, 3
(b) The image below shows a section through the wall of an artery.
X Y
×500
Calculate the actual width of the artery wall between points X
and Y. Give your answer to the nearest whole number.
Actual width =............................................μm [2]
© OCR Turn over
2025
Thursday 22 May 2025 – Morning
AS Level Biology B (Advancing Biology)
H022/02 Biology in depth
Time allowed: 1 hour 30 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
, INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra
space use the lined pages at the end of this booklet. The question numbers
must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working.
Marks might be given for a correct method, even if your answer is
wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an
asterisk (*).
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025
OCR is an exempt
[601/4721/0] DC
Charity Turn over
(LK/CB) 329634/3
, 2
1
(a) The mammalian circulatory system is described as a closed double circulatory system.
(i) Explain what is meant by a closed circulatory system.
..............................................................................................................................................
............
.................................................................................................................................. [1]
(ii) The diagram below shows the circulatory system of a frog.
Capillaries in the lungs and skin
right left
side side
Capillaries in the muscles
Blood leaving the heart of a frog is less oxygenated than blood leaving the heart of a
mammal.
Explain why blood leaving the heart of a frog is less oxygenated than blood leaving the
heart of a mammal.
..............................................................................................................................................
............
..............................................................................................................................................
............
..............................................................................................................................................
............
..............................................................................................................................................
............
.................................................................................................................................. [2]
© OCR
2025
, 3
(b) The image below shows a section through the wall of an artery.
X Y
×500
Calculate the actual width of the artery wall between points X
and Y. Give your answer to the nearest whole number.
Actual width =............................................μm [2]
© OCR Turn over
2025
