第六课

6 root of plants6植物的根

People often say "deep roots and luxuriant leaves". What are the functions of the roots of plants?人们常说“根深叶茂”，植物的根有哪些作用呢？

Material package材料包

Plants with roots, cotton, vegetable oil, etc带根植物、棉花、植物油等

Activity process活动过程

Look at the roots of plants and find out their characteristics观察植物的根，找一找它们的特点。

I know radish我知道萝卜·......

Roots like spinach, which have strong taproots and many lateral roots, belong to the taproot system.像菠菜这样，有粗壮的主根和许多侧根的根系，属于直根系。

Like scallion, there is no obvious taproot, only a lot of roots as long as beard.像葱这样，没有明显的主根，只有很多像胡须一样细长根的根系。

It belongs to fibrous root system.属于须根系。

What is the role of roots in the survival of plants?根对植物的生存有什么作用？

Do an experiment with impatiens.用凤仙花做个实验。

Just immerse the roots in water.只把根浸入水中。

V guided tours维导思航

1. 1. why should we cover the water with vegetable oil?为什么要在水面覆盖一层植物油？

2. 2. Will the water in the bottle decrease after a period of time? What does it mean?一段时间后，瓶中的水会减少吗？说明什么？

The root of plant has the function of fixing plant and absorbing water.植物的根有固定植物、吸收水分等作用。

Development activities拓展活动

Observe how gardeners protect the roots of plants when transplanting them.观察园林工人移栽植物时是怎样保护植物根部的。