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1 November 2012 Growth of a Pine Tree
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Abstract

The growth of a pine tree is examined by preparing “tree cookies” (cross-sectional disks) between whorls of branches. The use of Christmas trees allows the tree cookies to be obtained with inexpensive, commonly available tools. Students use the tree cookies to investigate the annual growth of the tree and how it corresponds to the number of whorls on the tree. Height—diameter and height—age relationships are also investigated. While aimed at high school classes, the procedure can be adapted for younger students.

© 2012 by National Association of Biology Teachers. All rights reserved. Request permission to photocopy or reproduce article content at the University of California Press's Rights and Permissions Web site at www.ucpressjournals.com/reprintinfo.asp.
Susan Wells Rollinson "Growth of a Pine Tree," The American Biology Teacher 74(9), 620-627, (1 November 2012). https://doi.org/10.1525/abt.2012.74.9.5
Published: 1 November 2012
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