![]() ![]() The central cylinder of growth (red number 1) is counted as the first year of growth. The transverse (x.s.) plane of this block of oak wood shows nine years of growth (9 annual rings). Questions 85-97: Three dimensional illustration of a block of oak wood: Questions 85-126: See illustrations in Wood Anatomy and Plant Fibers Used For Paper, Cordage & Textiles. See Resin Ducts In The Phloem Of A Poison Oak Stem The smaller series of concentric rings (knot) at the bottom of the photo is a lateral branch embedded in the main trunk. The central core of wood (#1 in close-up photo) counts as the first year of growth since the pith is no longer present. This basswood ( Tilia americana) trunk cross section has 24 distinct annual rings. On older stems where the central pith region has been replaced by xylem tissue, you must count the central core of wood as the first year of growth. Only count the layers of woody growth (xylem tissue), do not count the central core of pith. To calculate the age of this young stem cross section, just count the number of thick purple rings (bands) outside of the yellow pith. Questions 40-50: Cross section of a young, woody dicot stem (basswood): To calculate the age of a stem, see the following illustrations: You might want to download and print out the PDF version of Exam #5 because the illustrations are much higher resolution. Questions 1-77: See illustrations in Wood Anatomy and Cell Structure Of Stems. Many of theĪnswers can also be found in Plant Fibers Used For Paper, Cordage and Textiles.Īlso try your luck using the interactive Wood and Plant Fibers Crossword Puzzle. The diagrams are in the Wood Anatomy and Cell Structure Of Stems. For answers to many of the questions please refer to the Reading List for Exam #5.Īlso try the Wayne's Word Index & Economic Plant Families.
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