Biology · May / June 2026 · Paper 62 · Question 2

outline – single clear unbroken outline ;

size – equal to or greater than original size ;

detail 1 - the distance between the top bean and the middle bean is less than the distance between the middle bean and the bottom bean ; detail 2 - top bean, touches / overlaps, the outer edge of the pod ;

PQ = 33±1 (mm) ;

(×)1.7 ;;

temperature ;

volume of water / number of beans / frequency of watering ;

to, avoid bias / identify anomalies / identify outliers

OR

in case some do not germinate / to check viability of the seeds / AW ;

measuring cylinder / AVP ;

any six from:

1 (independent variable)

at least two different ages of bean ;

method

2 break up beans / extract catalase / blend with water ;

3 add (beans) to, (hydrogen) peroxide / H2O2 ;

4 description of apparatus to collect, gas / oxygen ;

5, 6 and 7 (variables kept constant) ;;;

8 at least three trials / two more repeats ;

9 relevant safety precaution (when using, enzymes / hydrogen peroxide) ;