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GCSE BIOLOGY PAPER 2H Mark scheme Specimen 2018 Version 1.0

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Question 1 Question Answers Extra information Mark AO / Spec. Ref. 01.1 (Jean Baptiste) Lamarck allow phonetic spelling 1 AO1/1 4.6.3.1 01.2 (snake is) covered in sediment / mud or sinks into the mud (then) the soft parts decay / are eaten or bones / hard parts do not decay (so) minerals enter bones or bones are replaced by minerals 1 1 1 AO2/1 4.6.3.5 AO2/1 4.6.3.5 AO1/1 4.6.3.5MARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL 7 Question 1 continued Question Answers Mark AO / Spec. Ref. 01.3 Level 2: A detailed and coherent explanation is provided. Logical links between clearly identified, relevant points explain how the rat snake evolved through the process of natural selection. 3–4 AO2/1 4.6.3.1 Level 1: Simple statements made, but not precisely. The logic is unclear. 1–2 AO1/1 4.6.3.1 No relevant content 0 Indicative content statements: • there are lots of different colours of snakes • some shades of green are closer to the colour of the environment (in Japan) than others • survivors (in each generation) will breed and produce offspring explanations: • different colours are controlled by different genes / alleles / are caused by mutations • being green means they are best suited to grassy / green environments • being green means they are camouflaged • those that are camouflaged best will be able to catch more food • those that are camouflaged best will be able to avoid being eaten • survivors’ offspring will inherit the genes / alleles / mutation for the shade of green colouration additional examiner guidance: • allow converse points relating to the Texas rat snake if they clearly identify the reasons why this snake was at an evolutionary disadvantage, ie more likely to be caught and eaten by a predator • a good level 2 answer will clearly link survival and breeding to the passing on of the advantageous genes / alleles / mutations and link the idea of colour (AO2) to a correct explanation of its significance for survival Question 1 continues on the next pageMARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL 8 Question 1 continued Question Answers Mark AO / Spec. Ref. 01.4 any one from: • changes to the environment • new predators • new diseases • new (more successful) competitors • catastrophic event / described event 1 AO1/1 4.6.3.6 Total 9MARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL 9 Question 2 Question Answers Extra information Mark AO / Spec. Ref. 02.1 methane is produced which is a greenhouse gas / causes global warming ignore bad smell 1 1 AO1/1 4.7.2.3 AO1/1 4.7.3.5 02.2 (9.80/0.20 = 49 therefore) 49:1 1 AO2/2 4.4.1.3 02.3 horse (manure) closest to 25:1 (ratio) allow ecf from 02.2 1 AO3/2a 4.7.2.3

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SPECIMEN MATERIAL




GCSE
BIOLOGY
PAPER 2H

Mark scheme
Specimen 2018
Version 1.0

, MARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL



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 Assessment Writer.

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




2

, MARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL



Information 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 Assessment Objectives and specification content that each question is intended to cover.
The extra information 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 and underlining
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 a mark are indicated by the use of or. Different terms in the
mark scheme are shown by a / ; eg allow smooth / free movement.
2.4 Any wording that is underlined is essential for the marking point to be awarded.

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 error / contradictions
equals or exceeds the number of marks available for the question, no marks can be awarded.
However, responses considered to be neutral (indicated as * in example 1) are not penalised.
Example 1: What is the pH of an acidic solution? (1 mark)

Student Response Marks
awarded
1 green, 5 0
2 red*, 5 1
3 red*, 8 0




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