Which of the statements correctly describes the process of cohesion in plant transport?
attraction of water molecules to other water molecules by hydrogen bonding
attraction of water molecules to the cellulose or lignin walls of xylem vessels
active transport of mineral ions into xylem vessels to lower water potential
creation of a hydrostatic pressure gradient in sieve tube elements
28 exam-style questions on OCR A A Level Biology Transport in plants. Each one has a worked solution and a mark scheme showing where the marks go.