A plant species has a waxy cuticle, leaf hairs and leaves that curl when touched.
A scientist placed the same fungal pathogen on groups of leaves after altering one defence. The scientist recorded the percentage of leaves that became infected.
| Treatment | Leaves infected in % |
|---|---|
| No defence altered | 6 |
| Waxy cuticle damaged | 68 |
| Leaf hairs removed | 8 |
| Leaves prevented from curling | 7 |
Calculate the greatest increase in the percentage of leaves infected compared with leaves with no defence altered.
State which alteration caused this increase.
Explain why this alteration increased infection.
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.