Unit 9: Exercise 1.1a Tree Trunks (Parts of a Tree)

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Biology in a Box presents a tutorial: Grades K-12 Tree Trunks (Parts of a Tree)
1. Students will be able to describe the five parts of a tree trunk.
2. Students will be able to explain the function and importance of the parts of a tree trunk.
3. Students will be able to make predictions of the tree's condition should one of the tree trunk parts become diseased (missing).
Just like humans, trees need several important things in order to help them grow and function. They need sunlight, water, and minerals that are contained in the soil, such as nitrogen, magnesium, calcium and potassium. Different parts of the tree help in providing for its growth. Starting as a seed, a tree pushes its roots into the soil as an anchor. The roots also collect minerals and water from the soil. As the tree grows, it reaches its leaves to the sky to collect energy from the sun. In a process called photosynthesis, a tree leaves use energy from sunlight to turn water and carbon dioxide into food for the tree. The leaves release oxygen into the air in the process. (This is just the reverse of our exchange of gases. We breathe in oxygen and release carbon dioxide when we exhale.) The food is used to keep the growing tree healthy and strong.
Trees have three main sections: the crown, the trunk and the roots. You will explore the five parts of the trunk in this activity.
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