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ACTUAL OCR 2024 OCR AS Level Biology A May-June 2024 Question Paper 1 WITH MARK SCHEME
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ACTUAL OCR 2024 OCR AS Level Biology A May-June 2024 Question Paper 1 WITH MARK SCHEME
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000287
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer for each question in the box provided.
1 Which process occurs during ventilation in bony fish?
A During expiration, the operculum opens
B During expiration, the volume in the buccal cavity increases and the pressure decreases
C During inspiration, the mouth opens causing the operculum to open
D During inspiration, the volume in the buccal cavity decreases and the pressure decreases
Your answer [1]
2 Which change in the mammalian gas exchange system takes place only during forced
expiration?
A Abdominal muscles relax
B Diaphragm contracts to become dome-shaped
C External intercostal muscles contract
D Internal intercostal muscles contract
Your answer [1]
3 The blue whale can grow up to 30 m long and can weigh up to 200 000 kg.
Whales have specialised surfaces for gas exchange.
Which option is not a reason why blue whales need a specialised surface for gas exchange?
A Transport of gases by diffusion is too slow
B Whales are multicellular organisms
C Whales have a high metabolic demand
D Whales have a large surface area to volume ratio
Your answer [1]
© OCR 2024
000288
, 3
4 The graph shows a trace recorded by a spirometer.
The trace shows a period of normal breathing whilst at rest, followed by a maximum inhalation
and maximum exhalation.
5.0
4.5
4.0
3.5
3.0
Volume of
air in air
chamber 2.5
(dm3)
2.0
1.5
1.0
0.5
0
0 20 40 60 80 100
Time (s)
What is the value for vital capacity?
A 0.70 dm3
B 0.90 dm3
C 3.15 dm3
D 4.50 dm3
Your answer [1]
© OCR 2024 Turn over
000289
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