Heartwood is often visually distinct from the living sapwood, and can be distinguished in a cross-section where the boundary will tend to follow the growth rings. For example, it is sometimes much darker. However, other processes such as decay or insect invasion can also discolor wood, even in woody plants that do not form heartwood, which may lead to confusion. COUNT 5
QSN1 In what part of a tree's cross-section is heartwood visible? ANS1 growth rings QSN2 What simple color distinction can heartwood have that makes it stand out from living wood in a tree? ANS2 darker QSN3 Along with insect infestation, what process can discolor wood and make it look like heartwood? ANS3 decay QSN4 What kind of plants never form heartwood? ANS4 woody QSN5 What is the living wood in a tree called? ANS5 sapwood