Which of the following statements correctly describes the structure or function of plant vascular tissues?
Mature xylem vessel elements contain cytoplasm and a nucleus to regulate water transport.
Companion cells are linked to sieve tube elements by plasmodesmata to support their metabolic needs.
Active loading of sucrose into the phloem occurs by simple diffusion through companion cell walls.
Sieve tube elements have highly lignified walls to withstand high hydrostatic pressures during translocation.
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.