A certain species of fungal pathogen infects young willow trees, invading the vascular bundles in the stem. The fungal hyphae physically block the xylem vessels and secrete enzymes that digest the walls of the phloem sieve tubes.
Explain how this damage to both the xylem and phloem tissues leads to the decline and eventual death of the willow tree.
13 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.