AQA
A-Level
BIOLOGY
3.2a Cells
2.5-2.7 | The Cell Cycle including Mitosis
Time allowed
38 minutes
MARK SCHEME
Score Percentage
/32 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, .(a) Variable that is changed;
Reject ‘the variable that changes’.
1
(b) 1. Idea of a confounding variable;
2. (So) genetically similar;
2. Do not accept ‘genetically identical / same DNA’.
3. (So) have similar salt tolerance / response to salt water / response to
watering treatment;
4. (So) have similar yield / mass of seeds;
Do not accept ‘amount / number of seeds’ or ‘growth rate’.
2 max
(c) Mitosis;
Ignore cell division
1
(d) 1. Irrigation with sea water / C / D increased yield compared with no
irrigation / A;
For ‘yield’ accept ‘mass of seed’ throughout.
2. Yield was lower when irrigated with sea water / C / D compared with
fresh water / B;
Only penalise once for use of ‘amount / number of seeds’.
A-Level
BIOLOGY
3.2a Cells
2.5-2.7 | The Cell Cycle including Mitosis
Time allowed
38 minutes
MARK SCHEME
Score Percentage
/32 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, .(a) Variable that is changed;
Reject ‘the variable that changes’.
1
(b) 1. Idea of a confounding variable;
2. (So) genetically similar;
2. Do not accept ‘genetically identical / same DNA’.
3. (So) have similar salt tolerance / response to salt water / response to
watering treatment;
4. (So) have similar yield / mass of seeds;
Do not accept ‘amount / number of seeds’ or ‘growth rate’.
2 max
(c) Mitosis;
Ignore cell division
1
(d) 1. Irrigation with sea water / C / D increased yield compared with no
irrigation / A;
For ‘yield’ accept ‘mass of seed’ throughout.
2. Yield was lower when irrigated with sea water / C / D compared with
fresh water / B;
Only penalise once for use of ‘amount / number of seeds’.
