DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Resin oozing from wood. Cross-section of a trunk of the larch tree (Larix eurolepis) showing the circular bands of growth rings, each ring representing a year of growth for the tree. Resin is being exuded from the cut end. This is produced within resin ducts and is thought to serve as a deterrent to wood-boring beetles and as a defence against rot fungi.
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