第八课

Transpiration of 8 leaves8叶的蒸腾作用

Hot summer, into the woods, will feel the air fresh and humid, why?炎炎夏日，走进树林，会感觉空气清新湿润，为什么呢？

Material package材料包

Plastic bags, rubber bands, etc.塑料袋、皮筋等。

Activity process活动过程

How does the water in the plant get rid of?植物体内的水分是怎样排出去的？

I guess it's through the leaves.我猜想是通过叶子排出去的。

This is my drawing of plant drainage.这是我画的植物排水图。

Do an experiment to verify our conjecture.做个实验验证我们的猜想。

In a plastic bag with leaves.......有叶片的塑料袋里。。。。。。。

Method guidance方法指导

Immerse a newly picked leaf in hot water and observe what happens on the surface of the leaf.将一片刚摘下的叶子浸入热水中，观察叶子表面有什么现象产生。

Stomatal map of leaf under direct root absorption microscope直根吸收显微镜下叶的气孔图

There are stomata on the surface of leaves. The water in the plant body is lost to the air through the stomata叶的表面有气孔。植物体内的水分通过气孔散失到空气中，这是

Transpiration of leaves.叶的蒸腾作用。

What is the significance of leaf transpiration for plant survival?叶的蒸腾作用对植物的生存有什么意义？

Transpiration can cool plants.蒸腾作用可以给植物降温。

Not bad····还可以····

Development activities拓展活动

To understand why garden workers remove some branches and leaves when transplanting plants.了解园林工人移栽植物时为什么要去掉一部分枝叶。

Unit evaluation单元评价

Knowledge paradise知识乐园

Fill in and say.填一填，说一说。

Taproot system直根系

classification分类

cooling降温

root根

leaf叶

Transpiration蒸腾作用

Absorb moisture吸收水分

effect作用

The body of plants植物的“身体”

flower花

characteristic特点

transport运输

stem茎

effect作用

Science Palace科学殿堂

Why do many plants lose their leaves in late autumn?为什么很多植物会在深秋落叶？

Reflection space反思空间

My harvest我的收获

·The survival rate can be improved by retaining more soil at the root when transplanting plants.·移栽植物时根部多留土能提高成活率。

I need to improve我需要改进的

··Water absorption experiment of root.根的吸水实验。

I want to continue to explore我想继续探究的

Is the number of leaves related to the water absorption capacity of the plants?叶的数量和植物的吸水能力是否有关？