CROWN
TRUNK
HEARTWOOD (INACTIVE) GIVES STRENGTH
SAPWOOD CARRIES SAP FROM ROOT TO LEAVES
CAMBIUM (MICROSCOPIC) BUILDS THE CELLS
INNER BARK CARRIES PREPARED FOOD FROM LEAVES TO CAMBIUM LAYER
OUTER BARK PROTECTS TREE FROM INJURIES
ROOTS
SURFACE ROOTS
TAPROOT
_Tree increases each year in height and spread of branches by adding on
new growth of twigs_
_Air supplies carbon the principal food of the tree taken in on under
surface of leaves._
_Leaves prepare the food obtained from air and soil and give off
moisture by transpiration. Light and heat are necessary for the chemical
changes_
_The breathing pores of the entire tree,—on leaves, twigs, branches,
trunk and roots take in oxygen. Flooding, poisonous gases, or smoke may
kill a tree_
_Root tips or root hairs take up water containing small quantity of
minerals in solution_
_The buds, root tips, and cambium layer are the growing parts of the
tree. Water containing a small quantity of minerals in solution is
absorbed by the roots, carried up through the sapwood to the leaves and
there combined with carbon from the air to make food. This food is
carried by the inner bark to all growing parts of the tree, even down to
the root tips_