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OCR AS-level Biology A 2023 Paper 1
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Full 2023 past paper - OCR AS-level Biology A Paper 1 - mark scheme included in the same document
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- Ian Ching Hei Chau , ianchau.1228@gmail.com , 1C Anglesey Drive, , Stockport, England, United Kingdom, SK12 1BTOxford Cambridge and RSA
Monday 15 May 2023 – Morning
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
You can use:
* 9 8 7 8 2 8 7 3 5 6 *
• a scientific or graphical calculator
• a ruler (cm/mm)
* 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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2023 [601/4261/3] OCR is an exempt Charity
DC (PQ/CB) 325488/7 Turn over
,-
-
Ian Ching Hei Chau , ianchau.1228@gmail.com , 1C Anglesey Drive, , Stockport, England, United Kingdom, SK12 1BT
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 statement describes a problem that has resulted from the increased use of antibiotics?
A Penicillin can no longer be used to treat infections.
B Rates of MRSA infection have increased.
C Some bacteria and fungi have evolved resistance to antibiotics.
D Viral infections can no longer be treated with antibiotics.
Your answer [1]
2 The diagram shows a computer model of the structure of an antibody.
A B
C
Constant region
D
Which part of the antibody, A, B, C or D, is an antigen-binding site?
Your answer [1]
© OCR 2023
,-
Ian Ching Hei Chau , ianchau.1228@gmail.com , 1C Anglesey Drive, , Stockport, England, United Kingdom, SK12 1BT
3
3 Simpson’s Index of Diversity (D) can be used to estimate the biodiversity of a habitat.
D=1– ∑ n
N ( ( ))2
Scientists calculated D for a grassland habitat. One year later, the scientists calculated D again
for the same habitat.
The number of plants recorded from one of the species increased from 100 to 400. All the other
values remained the same.
What would be the result of this change?
A Species richness would increase.
B The estimate of biodiversity would increase.
C The value of D would decrease.
D The value of N would decrease.
Your answer [1]
4 What is an example of in situ conservation?
A A botanical garden
B A breeding programme in a zoo
C A marine conservation zone
D A seed bank
Your answer [1]
© OCR 2023 Turn over
, - Ian Ching Hei Chau , ianchau.1228@gmail.com , 1C Anglesey Drive, , Stockport, England, United Kingdom, SK12 1BT
4
5 The giraffe is a species of mammal with the species name ‘camelopardalis’ and the genus name
‘Giraffa’.
What is the correct format for the binomial name of the giraffe?
A camelopardalis giraffa
B Camelopardalis giraffa
C G. camelopardalis
D Giraffa camelopardalis
Your answer [1]
6 Which kingdom contains species that are heterotrophic and composed of hyphae?
A Fungi
B Plantae
C Prokaryotae
D Protoctista
Your answer [1]
© OCR 2023
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