Parts of Tree.

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Presentation transcript:

Parts of Tree

Tree Parts What are the Three Main parts of a tree and What are Their Functions? 1. Crown: Manufactures food 2. Stem/trunk: Transports food, minerals, & water up and down the plant 3. Roots: Absorb water and minerals and transport them up through the stem to the crown.

Main Parts of a Tree

Trunk Parts Heartwood: Dead wood located in the center of the stem. Provides strength to the tree. Phloem: Food conducting tissue, brings the food from the leaves to the other parts of the tree Xylem: Supporting and water-conducting tissue, sometimes called the inner bark. The xylem brings the water up the tree Bark: Outer surface that protects the inner parts of the trunk

Growth of a Tree

Dendrochronology: the scientific study of growth patterns and the aging of trees as shown in their rings. Dendrodisc: tree cookie; a cross-sectional slice of a tree

Why study tree cookies? The growth rings of very old trees can tell us much about the weather conditions in long-ago times. In periods of great drought, the rings do not grow as thick as in seasons when rainfall is plentiful. From that fact, scientific historians can piece together many secrets of the long-dead past

What can the rings tell us? Easily visible rings can provide information about the weather, soil and light conditions over time

Why do Annual Rings vary in Width? 1. Competition for necessities 2. The amount of supply 3. Human interruption – selective cutting 4. Natural Disasters - fires, insect damage, etc.

Tree Cookies!

Growth/Tree Rings The dark lines represent the summer months The lighter rings represent the spring growing season http://www.idahoforests.org/img/cookie2.gif

Observations and Inferences For each picture, please draw it and record your observations and inferences

A.

Possible Inferences - Construction Growing on a slope May also be a fallen tree blocking the tree's growth

B.

Possible Inferences - Insect attack - Dead branch

C.

Possible Inferences - Fire damage - Large section of tissue damaged

D.

Possible Inferences Drought Insect attack