Compare pieces of pine and spruce bark from trunks thicker than 40 cm. Estimate the thickness of the bark, its strength, and thermal conductivity. What about the possible threats against which the bark could protect these trees?
Similarity: scaly bark, brittle in pine, less durable, poorly conducts heat
Difference: spruce has a darker brown color, bark is thinner than pine bark.
The pine crust is very well developed, and the spruce is weaker. The bast is well developed in spruce, and weak in pine. Spruce bark is stronger.
What the bark protects from: from drying out, overheating, freezing, drying out, from wounds (resin clogs them up), from bacteria and fungi.
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