Exam (elaborations)

AQA A level Biology - Paper 2 June 2022 (Mark Scheme)

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A level Biology (7402)

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AQA

This is the Mark scheme for the AQA A level Biology - Paper 2 June 2022 exam paper. The document is official and only sold for a limited time. It is locked on the AQA website. This is normally used as mock exams by your teachers !!

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Uploaded on June 22, 2023
Number of pages 22
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A-level
BIOLOGY
7402/2
Paper 2
Mark scheme
June 2022
Version: 1.0 Final

*226A7402/2/MS*

, lOMoARcPSD|27239690

MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022

Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant
questions, by a panel of subject teachers. This mark scheme includes any amendments made at the
standardisation events which all associates participate in and is the scheme which was used by them in
this examination. The standardisation process ensures that the mark scheme covers the students’
responses to questions and that every associate understands and applies it in the same correct way.
As preparation for standardisation each associate analyses a number of students’ scripts. Alternative
answers not already covered by the mark scheme are discussed and legislated for. If, after the
standardisation process, associates encounter unusual answers which have not been raised they are
required to refer these to the Lead Examiner.

It must be stressed that a mark scheme is a working document, in many cases further developed and
expanded on the basis of students’ reactions to a particular paper. Assumptions about future mark
schemes on the basis of one year’s document should be avoided; whilst the guiding principles of
assessment remain constant, details will change, depending on the content of a particular examination
paper.

Further copies of this mark scheme are available from aqa.org.uk

Copyright information

AQA retains the copyright on all its publications. However, registered schools/colleges for AQA are permitted to copy material from this booklet for their own
internal use, with the following important exception: AQA cannot give permission to schools/colleges to photocopy any material that is acknowledged to a third
party even for internal use within the centre.

Copyright © 2022 AQA and its licensors. All rights reserved.

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, lOMoARcPSD|27239690

MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022

Mark scheme instructions to examiners

1. General
The mark scheme for each question shows:
• the marks available for each part of the question
• the total marks available for the question
• the typical answer or answers which are expected
• extra information to help the examiner make his or her judgement and help to delineate what
is acceptable or not worthy of credit or, in discursive answers, to give an overview of the area
in which a mark or marks may be awarded.

The extra information in the ‘Comments’ column is aligned to the appropriate answer in the left-
hand part of the mark scheme and should only be applied to that item in the mark scheme.
At the beginning of a part of a question a reminder may be given, for example: where
consequential marking needs to be considered in a calculation; or the answer may be on the
diagram or at a different place on the script.
In general the right-hand side of the mark scheme is there to provide those extra details which
confuse the main part of the mark scheme yet may be helpful in ensuring that marking is
straightforward and consistent.

2. Emboldening
2.1 In a list of acceptable answers where more than one mark is available ‘any two from’ is
used, with the number of marks emboldened. Each of the following bullet points is a
potential mark.

2.2 A bold and is used to indicate that both parts of the answer are required to award the
mark.

2.3 Alternative answers acceptable for the same mark are indicated by the use of OR.
Different terms in the mark scheme are shown by a / ; eg allow smooth / free movement.

3. Marking points
3.1 Marking of lists
This applies to questions requiring a set number of responses, but for which students
have provided extra responses. The general principle to be followed in such a situation is
that ‘right + wrong = wrong’.
Each error / contradiction negates each correct response. So, if the number of errors /
contradictions equals or exceeds the number of marks available for the question, no
marks can be awarded.
However, responses considered to be neutral (often prefaced by ‘Ignore’ in the
‘Comments’ column of the mark scheme) are not penalised.

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, lOMoARcPSD|27239690

MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022

3.2 Marking procedure for calculations
Full marks can be given for a correct numerical answer, without any working shown.
However, if the answer is incorrect, mark(s) can usually be gained by correct substitution /
working and this is shown in the ‘Comments’ column or by each stage of a longer
calculation.

3.3 Interpretation of ‘it’
Answers using the word ‘it’ should be given credit only if it is clear that the ‘it’ refers to the
correct subject.

3.4 Errors carried forward, consequential marking and arithmetic errors
Allowances for errors carried forward are most likely to be restricted to calculation
questions and should be shown by the abbreviation ECF or consequential in the mark
scheme.
An arithmetic error should be penalised for one mark only unless otherwise amplified in
the mark scheme. Arithmetic errors may arise from a slip in a calculation or from an
incorrect transfer of a numerical value from data given in a question.

3.5 Phonetic spelling
The phonetic spelling of correct scientific terminology should be credited unless there is a
possible confusion with another technical term.

3.6 Brackets
(…..) are used to indicate information which is not essential for the mark to be awarded
but is included to help the examiner identify the sense of the answer required.

3.7 Ignore / Insufficient / Do not allow
Ignore or insufficient is used when the information given is irrelevant to the question or not
enough to gain the marking point. Any further correct amplification could gain the marking
point.
Do not allow means that this is a wrong answer which, even if the correct answer is
given, will still mean that the mark is not awarded.

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, lOMoARcPSD|27239690

MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022

Question Marking Guidance Mark Comments

1. Organic 2 4 correct = 2 marks
(2 x 2–3 correct = 1 mark
2. Respiration AO1)
0–1correct = 0 marks

3. Carbon 2. Ignore aerobic/anaerobic.
3. Accept
01.1 4. Calorimetry;; cells/tissue(s)/plant(s)/animal(s)/organism(s)/
NPP/ living material/biological molecules.
3. Ignore biomass/biological
materials/organic matter and reference to
‘dry’.
4. Accept calorimeter but reject colorimeter.
4. Accept phonetic spellings.

Question Marking Guidance Mark Comments

1. Carbon dioxide 6 1 to 6. Accept marks in suitable diagram.
combines/reacts with ribulose
bisphosphate/RuBP; (6 x 1. Accept idea of fixation for ‘reacts’.
AO1)
2. Accept: any answer which indicates that
2. Produces two glycerate (3- 2 × as much GP produced from one RuBP
)phosphate/GP using catalysed by Rubisco.
(enzyme) Rubisco; 2 and 3. Reject GP once if incorrectly named
e.g., glucose 3- phosphate.
3. GP reduced to triose
phosphate; 3. Must have idea of reduction. This may be
conveyed by stating mp4.
01.2 4. Using reduced NADP; 3 and 6. Only accept TP if triose phosphate
is also in the answer. However only penalise
5. Using energy from ATP; once.
4. Accept NADPH or NADPH2 or NADPH +
6. Triose phosphate converted to H for reduced NADP.
glucose/hexose/RuBP/ribulose
bisphosphate/named organic 4. Reject: Any reference to reduced NAD for
substance; mp4 but allow reference to reduction for
mp3.
4. and 5. must be in context of GP to triose
phosphate.

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Exam (elaborations)

AQA A level Biology - Paper 2 June 2022 (Mark Scheme)

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