A treatment prevents lignin from being deposited in the xylem vessel walls of young bean plants. Water is still pulled upwards through the xylem as the plants transpire.
Which pair of changes, compared with untreated bean plants, is most likely?
The stems take more force to bend and fewer xylem tubes remain open
The stems take more force to bend and more xylem tubes remain open
The stems take less force to bend and fewer xylem tubes remain open
The stems take less force to bend and more xylem tubes remain open
74 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.