第14课

第14课

Lesson 14

植物的“分身术 ”

"Separation" of plants

1.搜集关于植物繁殖的文字及图片资料 。

Collect text and pictures about plant reproduction.

准备月季，大蒜，甘薯，秋海棠等植物 。

Prepare rose, garlic, sweet potato, Begonia and other plants.

准备细沙，水，草木灰，剪刀，花盆，土等 。

Prepare sand, water, ash, scissors, flowerpots, soil, etc.

2.我们已经知道种子是植物用来繁殖后代的 。植物的其他器官能繁殖后代吗 ？把我们收集的资料交流一下吧 。

We already know that seeds are used by plants to produce offspring. Can other organs of plants reproduce? Let's exchange the information we collected.

l 植物怎样繁殖呢 ？

l How do plants reproduce?

秋海棠  甘薯    马铃薯    草莓     月季    大蒜   

 Begonia, sweet potato, potato, strawberry, rose and garlic

我认为秋海棠 ……

I think Begonia

我们设计实验研究一下 。

Let's design an experiment to study it.

l 我们动手做一做。

l Let's do it.

资料卡

index card for files

用茎繁殖常用的方法有扦插，压条等 。

The common methods of stem propagation are cutting, layering and so on.

扦插是剪取植物的一条枝条 ，把枝条的剪口部分插入湿润的土壤中 。不久 ，地下部分长出不定根 ，地上部分发芽 ，最后长成一株新植物 。

Cutting is to cut a branch of a plant and insert the cut part of the branch into the moist soil. Soon, the underground part grows adventitious roots, the aboveground part germinates, and finally grows into a new plant.

压条是把纸条从植株上弯下来，再把枝条中部的树皮剥掉下部半圈，然后把它埋进土壤中 ，要枝条的顶端露出地面 。等枝条生出不定根并长出新叶以后，再将其与母体切断。

Layering is to bend the paper from the plant, peel off the bark in the middle of the branch, and then bury it in the soil, so that the top of the branch is exposed to the ground. After the adventitious roots and new leaves grow, the branches are cut off from the mother.

3.植物的“分身术”使植物世界更加丰富多彩 。

The "separation" of plants makes the plant world more colorful.

4.选择自己喜欢的植物做繁殖实验 ，做好观察记录 。

Choose the plant you like to do the propagation experiment, and make observation records.