Woody stems _____.
have clusters of xylem and phloem
have bark, cambium, and sapwood
support coneflowers and pepper plants
are generally soft and green
are generally hard and brown
How is the age of a tree estimated?
Pairs of light and dark rings representing yearly growth are counted.
Thin rings representing known droughts are added up.
The total number of light and dark rings are counted.
Wide annual rings are subtracted from narrow annual rings.
Pairs of light and dark rings representing yearly growth are counted.
Which tissue layer of a woody stem contains active xylem?
cambium
heartwood
sapwood
bark
The tissue layer of a woody stem that contains active xylem is the sapwood.
Woody stems _____.
are generally soft and green
have bark, cambium, and sapwood
support coneflowers and pepper plants
have clusters of xylem and phloem
have clusters of xylem and phloem
Herbaceous stems _____.
are hard and rigid
have annual rings
do not contain xylem
do not contain wood
do not contain wood
What is the function of heartwood?
It contains the active xylem.
It provides support for the tree.
It produces new vascular tissue.
It protects the inside of the tree.