Which of the following tissue consist of mainly living cell (has the ability to differentiate) a) phloem; b) tracheid in softwood; c) fibers in hardwood; d) vascular cambium In wood fiber cell wall, xylan will likely found in: a) cellulose; b) hemicellulose; c) lignin; d) glucomanna In a wood fiber cell which structural layer contains the most of volume and weight: a) primary cell wall; b) secondary cell wall layer 1 (S1):; c) secondary cell wall layer 3 (S3); d) secondary cell wall layer 2 (S2)