Question 6
FThe figure shows a cross-section through part of a leaf.
Figure: A cross-section through part of a leaf, showing the layer covering the upper surface and an opening in the lower surface
a.[2]
Name structures A and B.
b.[2]
Explain how structure A helps to defend the leaf against pathogens.
c.[1]
Most pathogens that infect a leaf enter through structure B. Suggest why.
d.[2]
The leaves of one plant have a cuticle that is much thinner than normal. Suggest the effect this has on the number of leaves that become infected. Give a reason for your answer.
3.3 Plant disease Questions
58 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.