Which of these features or structures is characteristic of phloem tissue?
Lignified secondary cell walls
Sieve plates in the end walls of sieve tube elements
Complete absence of any cytoplasm or cellular organelles in all cells of the tissue
Continuous open vessels with no end walls whatsoever
82 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.