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第22课

2021-6-12 08:40| 发布者: admin| 查看: 102| 评论: 0

摘要: .

22 Where do plants grow 植物向哪里生长

A few soaked corn kernels, Petri dishes, opaque cartons, paper towels, scissors, Scotch tape, clay or plasticine.

几粒浸泡过的玉米粒、培养皿、不透光的纸盒、纸巾、剪刀、透明胶带、黏土或橡皮泥。

Where do plants grow?

植物向哪里生长？

Why does sunflower's head always face the sun?

向日葵的“头”为什么总朝向太阳？

Why does the root of a big tree always grow downward?

大树的根为什么总向下生长？

I think it might be......

我想可能是......

Our guess

我们的猜想

Experimental scheme

实验方案

Research question: where does the root of a plant grow?

研究问题：植物的根向哪里生长?

Materials: Several soaked corn kernels, paper towel, culture dish and clay.

实验材料：几粒浸泡过的玉米粒、纸巾、培养皿、黏土。

The experimental steps were as follows:

实验步骤：

1. Put the corn kernels in the Petri dish with the tip of the corn kernels toward the center of the Petri dish.

1.把玉米粒放到培养皿里，使玉米粒的尖朝向培养皿中心。

2. Fix corn kernels. Wet the tissue and cover the corn kernels. Cover the Petri dish and seal the mouth.

2.固定玉米粒。将纸巾浸湿，盖到玉米粒上。盖上培养皿盖，封好口。

3. Set the dish up and fix it with clay.

3.把培养皿立起来，并用黏土固定好。

4. Observe the growth direction of corn root every day and make records.

4.每天观察玉米粒根的生长方向，做好记录。

This experiment needs a long time to observe and study, but we should stick to it.

这个实验需要较长的时间来观察和研究，可要坚持住啊。

I want to study the relationship between plant growth and sunlight......

我想研究植物生长与阳光的关系……

Two weeks later, we will share our research results.

两周后，交流我们的研究成果。

I find......

我发现......

This is my observation record.

这是我的观察记录。

index card for files

资料卡

Sunflower's "head" will rotate with the change of the sun's position. This growth bending phenomenon caused by light stimulation is called phototropism.

向日葵的“头”会随着太阳位置的变化而转动，这种受光刺激而引起的生长弯曲现象叫向光性。

The phenomenon of plant roots growing underground is called geotropism.

植物的根向地下生长的现象称为向地性。

There are several growth reactions of plant roots: to grow in the fertilizer place, namely to fertilizer; In arid soil, the root will also grow to the water-bearing place, namely water-oriented.植物的根还有几种生长反应：向着有肥的地方生长，即向肥性；在干旱土壤中根也会向有水处生长，即向水性。

The directional movement of plants is called phototropism, land orientation, fertilizer oriented and water oriented.

向光性、向地性、向肥性、向水性统称植物的向性运动。

Tilt the two pots of flowers in different directions and observe the growth of the plants after a period of time.

把两盆花向不同的方向倾斜，过一段时间，观察植株的生长有什么变化。

Investigate the growth of plant leaves on campus.

考察校园里植物叶子的生长情况。

Imagine how plants grow in space.

设想一下在太空中植物会怎样生长。