An AS-level Biology exam paper is structured to comprehensively evaluate students' grasp of fundamental biological concepts. Divided into various sections, each corresponds to specific themes within the AS-level Biology curriculum, including cell biology, genetics, ecology, evolution, and physiolog...
Monday 11 October 2021 – Morning
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
You can use:
* 8 9 3 4 6 3 3 8 4 9 *
• a ruler (cm/mm)
• a scientific or graphical calculator
* H 0 2 0 0 1 *
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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
3
4 The sounds of the heartbeat due to heart valves closing can be described as ‘lub-dub’. The ‘lub’
sound occurs at the beginning of ventricular systole.
Which of the options, A to D, describes what is happening when the ‘lub’ sound is heard?
A semilunar valves opening and blood entering the ventricles
B semilunar valves closing and blood entering the ventricles
C atrio-ventricular valves opening and blood leaving the ventricles
D atrio-ventricular valves closing and blood leaving the ventricles
Your answer [1]
5 The rate of transpiration of water can be estimated by recording the rate of water uptake using
a potometer. Two potometers were set up, one with large leaves and one with small leaves.
A calibrated capillary tube that had a diameter of 1 mm was used to introduce the bubble.
Which of the options, A to D, shows the most appropriate units to compare the rate of
transpiration of large leaves compared to small leaves?
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