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ocr AS Level Biology A (H020-01) Question Paper May2024.
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ocr AS Level Biology A (H020-01) Question Paper May2024.
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ocrMonday 13 May 2024 – Morning
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
You can use:
a scientific or graphical calculator
a ruler (cm/mm)
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
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 using 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 [ ].
• This document has 28 pages.
ADVICE
• Read each question carefully before you start your answer.
Turn over
verified
, 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]
verified
, 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 2.5
chamber
(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]
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