第二课

  2 animal skin2  动物的皮肤

1. There are scales on the skin of carp, spines on the skin of hedgehog and thick skin of elephant．．．．．．．What is the function of animal skin?鲤鱼的皮肤表面长有鳞片,刺猬的皮肤上长着刺儿,大象的皮肤作常粗糙．．．．．．．动物的皮肤有什么功能?

Material package:材料包：

Balloons, detergent, etc.气球、洗洁精等。

Activity process活动过程

Observe the surface of the fish and talk about what you find.●观察鱼身体表面,说说有什么发现。

1、1. The back and abdomen of the fish are not the same color.鱼的背部和腹部颜色不一样。

 The surface of a fish is slippery鱼的表面滑滑的。

       What's the function of the line on the side of the fish鱼侧面的线有什么作用

Mind navigation思维导航

1. How does the color of fish's body surface help the survival of fish?鱼身体表              面的颜色对鱼的生存有什么帮助？

2. What are the functions of scales and mucus on the surface of fish?鱼身体表  面的鳞片和黏液有什么作用?

3Which color is more difficult to find?“小鱼”涂哪种颜色更不容易被发现？

4、Inquiry skills探究技能

Through simulation activities to verify which color of "small fish" is more difficult to be found, is doing simulation experiments.通过模拟活动来验证哪种颜色的“小鱼”更不容易被发现，就是在做模拟实验。

1、 A balloon filled with water is used to simulate the body of a fish.用装水的气球模拟鱼的身体。

2、Put on the detergent and touch it again. I find that涂上洗洁精，再摸一摸，我发现......

index card for files资料卡

The side line is a part of the skin of the fish. It is long on both sides of the fish's body and can help the fish avoid obstacles in the water Objects, sense the change of water flow.侧线属于鱼皮肤的一部分，多长在鱼身体的两侧，能够帮助鱼在水中躲避障碍物，感知水流的变化。

How does the skin of other animals adapt to the environment? 其他动物的皮肤是怎样适应环境的？

duck鸭子

porpoise海豚

Hippo河马

chameleon变色龙

Polar bear北极熊

1. Can't leave the water for a long time, because the skin1、不能长时间离开水，是因为皮肤....

index card for files资料卡

2. Polar bears have thick long hair on the surface, which is hollow, colorless and transparent, and can be seen in sunlight

White under irradiation, can reduce the loss of body heat, resist cold.2、北极熊体表有厚厚的长毛，这些长毛是中空的，无色透明，在阳光的照射下呈白色，能够减少身体热量的散失，抵御寒冷。

3、 Some animal skin surface is covered with scales, hair or a.有的动物皮肤表  面覆盖着鳞、毛或甲等。

Development activities拓展活动

1. Observe the skin characteristics of the surrounding animals and talk about the new discoveries.1、观察周围动物的皮肤有什么特点，说一说有哪些新的发现。