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OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of pupils of all ages and abilities. OCR qualifications include
AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry
Level qualifications, NVQs and vocational qualifications in areas such as IT, business,
languages, teaching/training, administration and secretarial skills.
It is also responsible for developing new specifications to meet national requirements and the
needs of students and teachers.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
1 (a) upper epidermis (1) 1 allow labelled on diagram by part X
(b) more or many chloroplasts or chlorophyll (to 2 allow densely packed
absorb light) (1) ignore large surface area
at or near top of leaf (to absorb light) (1) ignore simply `next to surface' i.e.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
2 (a) 2 second mark is dependent on first marking point
blue tits (area 30 squares)
allow scale drawing non-pyramid
caterpillars (area 50 squares) e.g.
cabbages (area 450 squares)
correct labelled pyramid i.e.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
(c) 2 ignore (mechanism of transfer) run-off / leaching / spray drift from land
into river
ignore references to eutrophication
idea that herons' food is killed or reduced / e.g.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
3 (a) high temperature kills microorganisms 1 more than one tick scores zero
the solution prevents microorganisms
getting oxygen
the solution causes microorganisms to
lose water
the solution is too acidic for
microorganisms
(b) (i) osmosis (1) 1 allow plasmolysis
ignore loss of water / dehydration / desiccation
ignore flaccid / crenation
(ii) plasmolysed (1) 1 allow flaccid
ignore crenation
ignore loss of turgor
(c) (i) pressure of water or membrane or cytoplasm or…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
4 (a) 101 (1) 1
(b) (i) nitric (acid) (1) 1 allow correct formula i.e.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
5 (a) N2 + 3H2 2NH3 2 balancing mark is conditional on correct formulae
formulae (1) allow any correct multiple e.g. 2N2 + 6H2 4NH3
balancing (1) allow = or for arrow
not `and' or & for +
allow one mark for correct balanced equation with incorrect use of upper
and lower case formulae
e.g. n2 + 3H2 2nH3
e.g.…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
6 (a) filtration - to remove solid particles (1) 2 allow remove (large) objects or bits
allow to remove insoluble particles
ignore to remove (large) particles
sedimentation (1)
(b) from lead pipes (1) 1 allow from lead compounds in petrol / shot gun pellets / (lead) fishing
weights / (lead) roofing
ignore just `from pipes'
allow from old pipes
allow from rocks
Total 3
7…read more

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B624/02 Mark Scheme June 2010
Question Expected Answers Marks Additional Guidance
7 (a) allotrope (1) 1 if answer line is blank then allow correct answer circled, underlined or
ticked in list
(b) layers weakly held together / layers can slide over 1 ignore references to intermolecular forces or bonds
each other (1)
(c) (delocalised) electrons move (1) 1 allow delocalised electrons / free electrons / sea of electrons
(d) hard (1) 2 allow hard wearing
allow it can't be scratched
ignore hard to break or…read more

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