第七课

The stem of a plant 7植物的茎

Through which part of the plant does the water absorbed by the root reach the "body" of the plant?根吸收的水分是通过植物的哪个部分到达植物“身体”各处的？

Material package材料包

Leafy branches, red ink, etc带叶枝条、红墨水等

Activity process活动过程

What do you find when you look at the stems of different plants?观察不同植物的茎，有什么发现？

Bamboo竹子

Willow柳树

Corn玉米

V guided tours维导思航

1. 1. Which part of willow is the stem? What's on the stem?观察柳树，哪个部分是茎？茎上长有什么？

2. What are the similarities between the stems of willow, bamboo and corn柳树、竹子、玉米的茎有什么相似的地方？

Are they also stems?它们也是茎吗？

water chestnut荸荠

onion洋葱

the lotus root莲藕

What is the role of stem in plant survival?茎对植物的生存有什么作用？

I think the stem can carry water我认为茎能运输水分

in my submission......我认为......

Let's do an experiment to observe.我们做个实验来观察一下。

Pay attention to safety when using scissors.使用剪刀要注意安全。

V guided tours维导思航

1. 1. What happened to the Impatiens soaked in red water?浸泡在红色水里的凤仙花发生了什么变化？

2.From this we can deduce: what is inside the plant stem?由此推想：植物茎的内部有什么？

How to observe the interior of the stem?怎样观察茎的内部？

Draw what we observe.把我们观察到的现象画下来。

Pay attention to safety when using knife.使用小刀要注意安全。

Inquiry skills探究技能

Cut the stem of Impatiens horizontally and vertically to understand the interior of the stem is to observe.把凤仙花的茎横切、纵切，了解茎的内部，就是在观察。

The stem supports the plant's "body" and carries water.茎能支撑植物的“身体”，还能运输水分。

Development activities拓展活动

Look up the information to find out how the tumor on the tree is formed.查阅资料，了解树上的树瘤是怎样形成的。