AP BIOLOGY

Detailed explanation-1: -These rings can tell us how old the tree is, and what the weather was like during each year of the tree’s life.

Detailed explanation-2: -As a first step to studying tree rings, scientists cork the tree to its core without hurting it in anyway. They use a hollow drill bit to core the tree up to its centre which takes a considerable amount of time. Now this core is pulled out to examine patterns of rings and study them in detail under a microscope.

Detailed explanation-3: -Count the dark rings to calculate the age of the tree. Start in the middle of the stump or cross-section of wood and count the first dark ring you see. Continue counting outwards from the middle ring until you reach the last dark ring. The total number of dark rings represents the age of the tree in years.

Detailed explanation-4: -Dendrochronology can show us more than just the age of trees. It can also give us a glimpse into past climatic conditions. In temperate zones, one year of growth will equal one tree ring. A wet growing season makes a wider ring, while a dry growing season makes a narrower ring.

Detailed explanation-5: -In summer, growth is slower; the wood has smaller cells and is darker. So when the tree is cut, the layers appear as alternating rings of light and dark wood. Click the cross section of the tree ring above to view the whole ring as it came from the tree. Count the dark rings, and you know the tree’s age.