Analysing Skills
(You can be asked to explain why something has happened by providing evidence)
1. A sports club wants to find out how well a weed killer will get rid of daises on a cricket
pitch. One area was sampled using 1m2 quadrats before spraying with the weed killer and
again three weeks after spraying. The results are shown below.
Quadrats
1
2
3
4
5
6
7
8
9
10
Before spraying
3
5
2
4
7
3
7
4
6
5
After spraying
2
2
1
3
3
2
3
3
3
3
a) Based on the results of this investigation, state whether or not you9 would recommend
the use of this weed killer. Justify your answer.
2. The diagram below shows an experiment set up to investigate the ethanol production (%
ethanol concentration) by two different species of yeast cells.
1cm3 of species B yeast +
3
1cm of species A yeast +
3
50cm of glucose solution
14
12
10
Ethanol
concentration
(%)
8
6
4
2
0
50 cm3 of glucose solution
a) Describe the production of ethanol in flask A between 0 and 60 hours.
b) State which species of yeast you would choose for large scale ethanol production.
Give a reason for your choice.