科一科二 · 科一
A Tree Is a Plant
A tree is a plant. A tree is the biggest plant that grows. Most kinds of trees grow from seeds the way most small plants do. There are many kinds of trees. Here are a few of them. How many do you know?
This tree grows in the country. It might grow in your yard, too. Do you know what kind it is?This is an apple tree. This apple tree came from a seed. The seed was small. It grew inside an apple. Have you ever seen an apple seed? Ask an adult to help you cut an apple in two. The seeds are in the center. They look like this.
Most apple trees come from seeds thatare planted. Sometimes an apple tree grows froma seed that falls to the ground. The wind blows leaves over the seed. The wind blows soil over the seed. All winter the seed lies under the leaves and the soil. All winter the seed lies under the ice and snow andis pushed into the ground. Spring comes. Rain falls. The sun comes out and warms the earth. The seed begins to grow.
At first the young plant does not look like a tree. The tree is very small. It is only a stem with two leaves. It has no apples on it. A tree must grow up before it has apples on it. Each year the tree grows. It grows tall. In seven years it is so tall that you canstand under its branches. In the spring there are blossoms on the tree. Spring is apple-blossom time.
The blossoms last only a few days. Then they fall to the ground. Now there are green leaves on the tree. Among the leaves thereare small apples. The apples are where the blossoms were before. The apples are green, and they are almost too small for you to see. The apples grow slowly.
