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A Level Biology B (Advancing Biology)H422/03 Practical skills in biology 2022
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A Level Biology B (Advancing Biology)H422/03 Practical skills in biology 2022
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Oxford Cambridge and RSATuesday 19 October 2021 – Afternoon
A Level Biology B (Advancing Biology)
H422/03 Practical skills in biology
Time allowed: 1 hour 30 minutes
You must have:
* 8 9 5 9 4 3 8 9 2 9 *
• the Insert (inside this document)
• a ruler (cm/mm)
You can use:
• a scientific or graphical calculator
* H 4 2 2 0 3 *
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 60.
• 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 2021 [601/4720/9] OCR is an exempt Charity
DC (LK/CB) 300441/3 Turn over
, 2
BLANK PAGE
PLEASE DO NOT WRITE ON THIS PAGE
© OCR 2021
, 3
Answer all the questions.
1 Memory loss occurs as part of the normal ageing process in the human brain.
Researchers carried out an investigation into the effect of ageing on short-term memory using a
word recall task as described below.
• 40 participants were divided into two groups, A and B, dependent on age.
• Group A consisted of 20 people aged between 25 and 45 years old.
• Group B consisted of 20 people aged between 55 and 75 years old.
• A list of 12 words was read out to each participant.
• After a short pause, each participant was asked to recall words from the list and write
them down.
• The researchers recorded the number of words that had been correctly and incorrectly
recalled.
• Correctly recalled words were on the list of 12 words read out. Incorrectly recalled words
were not on the list.
(a) (i) State the independent variable for this investigation.
...................................................................................................................................... [1]
(ii) The sex of the participants was controlled during the investigation by ensuring that there
were an equal number of men and women in each group.
Apart from sex, state one other variable that needed to be controlled and suggest how it
could have been controlled by the researchers.
Variable .............................................................................................................................
How it could have been controlled ....................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
© OCR 2021 Turn over
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