BISC 337 Lecture Notes - Lecture 20: Cork Cambium, Vascular Cambium, Xylem

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All the tissue outside the vascular cambium: consist of, 1) inner bark, 2) outer bark (rhytidome) Secondary phloem also contains axial and radial systems: axial system, sieve tube members and companion cells in angiosperms, sieve cells and albuminous cells in gymnosperms. Products used by people that are derived from bark include: spices and other flavorings, tannin for tanning leather, resin as wood adhesives, latex, aspirin, poisons, cork. Wood: in terms of importance to humans wood ranks no. Plants that provide us food: canada is a leading producer of lumber, half of the landmass are forests. What is wood: secondary xylem, based on structural differences, wood is mainly classified as, 1) hardwood, mainly angiosperms, 2) softwood, mainly gymnosperms (conifers) 3 different cuts: 1) transverse, cross section, 2) radial longitudinal section (r. l. s. , cut passes through the centre of the stem, 3) tangential longitudinal section (t. l. s, cut does not pass through the centre. Cells of the axial system: vessels, tracheids, fibres, parenchyma.

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