A horticultural centre compares two varieties of an ornamental plant. One variety makes a poison and the other variety does not.
The same group of wild rabbits fed from the plants on two evenings. Scientists also added an extract from each variety to separate samples of bacteria.
If bacteria were not growing after an extract was added, the extract had killed the bacteria or stopped them growing.
| Plant variety | Mass eaten on the first evening in g | Mass eaten on the second evening in g | Bacteria growing after the leaf extract was added |
|---|---|---|---|
| A | 24 | 6 | Yes |
| B | 22 | 21 | No |
Calculate the decrease in the mass of variety A eaten between the first and second evenings.
State which plant variety is most likely to make the poison.
State which plant variety makes a substance that kills or stops the growth of bacteria.
Name the group of plant defences to which the poison and the bacteria-killing substance belong.
133 exam-style questions on AQA GCSE Biology 3.3 Plant disease, covering 3.3.1 Detection and identification of plant diseases and 3.3.2 Plant defence responses. Each one has a worked solution and a mark scheme showing where the marks go.