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Unformatted text preview: creases the diameter of the stems and roots in woody plants Secondary growth
o Occurs in stems and roots of woody plants
o The secondary plant body consists of tissues produced by the vascular cambium and cork cambium Primary and Secondary Growth of a Stem
o Figure 35.19 20 Vascular Cambium
o Figure 35.20 Result of Secondary Growth
o Heartwood: older layers of secondary xylem 21 No longer transport Often clogged with resins
o Sapwood: younger layers of xylem Still transports water Bark
o Bark All the tissues external to the vascular cambium Includes secondary phloem and periderm
o Cork cambium Gives rise to the secondary plant body’s protective covering, or periderm
o Lenticels Ares in the periderm where gas exchange with the outside air can occur Chapter 36: Resource Acquisition and Transport in Vascular Plant
Concept 36.1: Adaptations for acquiring resources were
key to steps in the evolution of vascular plants Figure 36.2
Concept 36.2: Different mechanisms transport substances over short or long distances Transport in vascular plants...
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This note was uploaded on 02/03/2014 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.
- Spring '08