Well, students. Today, I'm going to talk about plants. I'd like to put my talk into two parts. The first part will be about trees and the second will be about f

Well, students. Today, I'm going to talk about plants. I'd like to put my talk into two parts. The first part will be about trees and the second will be about flowering plants. Let's begin with trees. A tree consists of three main parts: the crown or canopy, trunk and roots. The crown or the canopy is at the top of a tree. It filters dust and other particles from the air. It consists of leaves, branches and twings. As you all know, the leaves are the food factories of a tree. They contain cholorophyll which helps the photosynthesis process and gives green color to the leaves. Now, let's talk about trunk, or stem. The trunk of a tree supports the crown and gives the tree its shape and strength. The trunk consists of some layers. The layers carry water and minerals up from the roots to the leaves, and they carry sugar down from the leaves to the branches, trunk and roots. What about roots? A tree's roots absorb water and nutrients from the soil, store sugar and hold the tree upright in the ground. Roots also have a lot of branches. Some roots can go down more than four meters! Now look at this chart and...(fade).

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