Y9 Summer Exam (Foundation) Markscheme

Y9 SUMMER EXAM (FOUNDATION) MARKSCHEME

BIOLOGY

M1.(a) (i)A = cytoplasm

B = (cell) membrane

(ii)nucleus

accept chromosome / DNA / genes

accept phonetic

(b)

[6]

M2. (a) (i) nucleus

(ii)chromosome

(iii)gene

each for 1 mark

(b)a body cell

for 1 mark

[4]

M3. (a)A nucleus

B (cell) membrane

C cytoplasm

(b) (i) it is thin

(ii)diffusion

[5]

M4.(a) (i)release energy

allow provide / supply / give energy

donot accept produce / create / generate / make energy

donot allow release energy for respiration

(ii)contain half the (number of) chromosomes or contains
one set of chromosomes or contains 23 chromosomes

allow genetic information / DNA / genes / alleles instead of chromosomes

accept haploid

(b) any two from:

•(stem cells) are unspecialised / undifferentiated

allow description eg ‘no particular job’

•are able to become differentiated
or can form other types of cell / tissue / organ

•stem cells can / able to divide / multiply

[4]

M5.Marks awarded for this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. Examiners should also apply a ‘best-fit’ approach to the marking.

0 marks

No relevant content.

Level 1 (1 – 2 marks)

An example is given of a named substance
or
a process
or
there is an idea of why diffusion is important eg definition.

Level 2 (3 – 4 marks)

At least one example of a substance is given
and
correctly linked to a process in either animals or plants.

Level 3 (5 – 6 marks)

There is a description of a process occurring in either animals or plants that is correctly linked to a substance
and
a process occurring in the other type of organism that is correctly linked to a substance.

examples of points made in the response

Importance of diffusion:

•to take in substances for use in cell processes

•products from cell processes removed

Examples of processes and substances:

•for gas exchange / respiration: O2 in / CO2 out

•for gas exchange / photosynthesis: CO2 in / O2 out

•food molecules absorbed: glucose, amino acids, etc

•water absorption in the large intestine

•water lost from leaves / transpiration

•water absorption by roots

•mineral ions absorbed by roots

extra information

Description of processes might include:

•movement of particles / molecules / ions

•through a partially permeable membrane

•(movement of substance) down a concentration gradient

•osmosis: turgor / support / stomatal movements

[6]

M6. (a)because water enters (the cell / it / named cell)

donot accept salt / sugar / solution entering

by osmosis / diffusion

if osmosis / diffusion not given accept concentration inside cell greater than outside cell

assume concentration refers to solute concentration unless answer indicates otherwise

allow water goes up the concentration gradient

allow water goes down its concentration gradient

donot accept if diffusion of salt / sugar

from dilute to more concentrated solution1

through a partially permeable membrane

allow semi / selectively permeable membrane or description

(b) (plant cells) have (cell) wall

accept animal cells have no (cell) wall

ignore reference to cell membrane

donot accept reference to other organelles or any implication that animal cells have a cell wall eg plant cells have a thicker cell wall

[5]

CHEMISTRY

M7.(a) (mass number) (6) 7

(protons) 3 (3)

(neutrons) 3 (4)

(b) isotopes

[4]

M8.(a) (i)B

(ii)A

(iii)C

(b) D and E

[5]

M9.(a)layers

which have weak forces / attractions / bonds between them

second mark must be linked to layers

which can slide over each other or separate

ignore references to rubbing

(b) covalent

[3]

M10. (a)carbon

(b) each atom is joined to four other atoms

It has a giant structure

[4]

M11.the atoms are in layers

the atoms can slide over each other

[2]

M12. (a)positive / + / 2

gains 1 mark

but 2+ / ++ / +2

gains 2 marks

(b)Ideas that: 2
Ca2+
Br- [Do not disqualify for "bromine" ions]
Ions / They are in the ratio 1:2

any two for 1 mark each

[4]

M13. (a) 2,4 (drawn as crosses) on shells

accept dots / e / - etc.

(b)(i) hard

allow rigid / high melting point

donot allow references to bonding

ignore strong

ignore unreactive

ignore structure

(ii)anythree from

max2 if ionic / metallic / molecule / intermolecular bonds or incorrect number of bonds

•giant structure / lattice / macromolecular

allow many bonds

•covalent (bonds)

•(covalent) bonds are strong

accept needs lots of energy to break bonds (owtte)

•(each) carbon / atom forms four bonds
or
(each) carbon / atom bonded to four other atoms

max2 if ionic / ions / metallic / molecule

‘it’ needs to be qualified

graphite

•has delocalised / free electrons

donot accept the electrons move unless qualified (around structure etc)

electrons that can move through / around the structure

•each carbon is joined to three other carbon atoms

allow graphite has three bonds

one electron from each atom is free / delocalised

diamond

•has no free / delocalised electrons

donot accept the electrons do not move

no electrons that move around the structure

•all the electrons are used for bonding

allow diamond has 4 bonds

each carbon joined to four other carbon atoms

[8]

M14. (a) (i)

(ii)nucleus

(b)it has 2 more neutrons or converse

O-16 has 8 neutrons (1 mark)

O-18 has 10 neutrons (1 mark)

[4]

PHYSICS

M15.(a) 25(Ω)

(b) (i)2(V)

allow1 mark for showing a correct method, ie 6 / 3

(ii)equal to

[4]

M16.(a)(i) 15

(ii) 4.5 or their (a)(i) x 0.3 correctly calculated

allow1 mark for correct substitution, ie 0.3 x 15/their (a)(i), provided no subsequent step

(ii)decrease

(b)Y

accept any correct indication

reason only scores if Y is chosen
accept voltage for p.d.

(only one that) shows a direct current / p.d.
or
a battery / cell gives a direct current

accept both X and Z are a.c.

or
a battery/cell gives a constant current/p.d.

accept it’s a constant current/p.d.
it is not changing is insufficient

[6]

M17. (a)circuit symbol for a lamp correct

accept any standard of drawing providing circuit would work

circuit symbol for a cell correct

2 lamps drawn in parallel with 3 cells

polarity of cells must be correct (+ to –) but cells may be either way around

(b) 4.5

(c)the same as

accept any clear indication of the correct answer

[5]

M18.(a) (i)p.d. is (directly) proportional to current
or
gradient / slope is constant
or
the lines show constant resistance

accept lines are straight / diagonal

(ii)C

reason only scores if C is chosen

for the same p.d. the current is the smallest

accept lowest gradient and the gradient = 1 / R

(b) (i) ohm

accept correct symbol Ω
accept an answer written in the table if not given in answer space

(ii)K and L

reason only scores if both K and L are chosen

only length varies

accept type of metal and the diameter are the same

(iii)measure the resistance of more wires made from different metals

accept test more (types of) metals
measure the resistance of more wires is insufficient
they only use two metals is insufficient

accept voltmeter symbol correct and drawn in parallel with the battery

(ii)correct symbol drawn

symbol must be rectangular

[9]

M19.(a) (i)also double

increases is insufficient

(ii)variable resistor

accept rheostat / potentiometer

(b)(i) the data / results / variables are continuous

accept data / results / variables are not categoric / discrete

(ii)misreading the ammeter

donot accept misreading the meter / results

donot accept misreading the ammeter and / or voltmeter

reading / human error is insufficient

(iii)straight line from the origin drawn passing close / through
points at 1 V, 5 V, 6 V and ignoring anomalous point

donot accept line drawn ‘dot-to-dot’

(iv)yes

mark is for the reason

supportspredictionor(straight) line passes through the origin

accept a mathematical argument, eg when p.d. went from 2 to 4 the current went from 0.3 to 0.6

it’s directly proportional is insufficient

[6]