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GCSE Combined Science · key term
A swollen growth of plant tissue; in crown gall disease, it forms when bacteria stimulate disorganised cell growth.
Used by OCR
Specification B6.3f · Biology Paper 2
Revise: Viral, Fungal and Bacterial Plant DiseasesThree examples show how different pathogens produce different symptoms: tobacco mosaic virus, barley powdery mildew and crown gall disease.
Describe the distinguishing symptoms: mosaic leaf discolouration, white powdery leaf growth, or swollen galls.
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