مساعدة في بناء وضعية حول تجربة علمية باللغة الانجليزية

djaberbenhayan · 2009-02-06, 09:47

السلام عليكم ورحمة الله وبركاته
نرجو من الاخوة الكريم
مساعدة في بناء وضعية حول تجربة علمية باللغة الانجليزية

koukita · 2009-02-06, 12:18

اليك بحثنا في الانجليزية

The People’s Democratic Republic of Algeria
Ministry of National Education

Secondary Education Year two

Project of :

Members of the project :

Year school :2008-2009

Title of the experiment

The process of photosynthesis

Prove the presence of starch in the green plants

The *******s of the search

Introduction

Experiment requirements

Prepare Samples

Experience steps

Note the results of the experiment

Conclusion of the experiment

Some of the pictures to illustrate the experience

Conclusion

1 / Introduction:

Plants are considered one of the most important factors to maintain the environmental balance. And we can be aware of this fact through a simple comparison. Valehiawanat and other organisms that live in our use of oxygen
and release carbon dioxide to the atmosphere. As well as heat and release water vapor. And the factories to the same amount of heat and carbon dioxide, the result of various industrial activities. On the other hand, that the plants Bimtsas heat and carbon dioxide from the air. It is used both during the process of photosynthesis absolute oxygen continuously to the atmosphere. That such a delicate balance can not in any way to assume his accident. Such an assumption would be as absurd and logic of good.

2/ Experiment requirements:

Plant of giranyum ( Green color)

A light source

- Black cover

Three basins

- The first basin : Boiling water for 15 minutes
- The second basin : alcohol
- The third basin: Water iodine

- The source of heat

- Hour electronic

- Plate glass

3 / Prepare Samples:

We use the giranyum plant which use us in the potted soil and take it straight, three papers from the plant to be:

-The first paper : Completely exposed to light
- The second paper: Completely covered with black cloth
- The third paper: Partially covered with black cloth

4/ Experience steps:

1- The three papers tend and we dip them in the first basin of the water boiling for a few minutes.

2- Then we are transported to the basin of the second adults and let them for 10 minutes in order to lose color and turn to alcohol to the green color gradually.

3- then we put out of the second basin and put in the third basin of water Lalliot for half an hour.
4- Get out of the basin, the three papersand clean them by the water.

5/ Note the results of the experiment:
After clean the papers by the water we Put the paper over the glass and we have observed them we note :

1) The emergence of blue-purple stains on the surface of the first paper, which was completely exposed to the light

2)The emergence of non-blue-purple stains on the surface of the second paper, which was completely covered with black cloth was not affected by light.

3) The emergence of blue-purple on the surface of half of the paper exposed to light and not only appear in the other half, which was covered with black cover of the third paper.

6/ Some of the pictures to illustrate the experience:

7/ conclusion of the experiment:

Through the results we can say that the plant at the green light can install its own organic materials such as starch and composition of this process called photosynthesis to take place and require the presence of chlorophyll, light, carbon dioxide (C02), water and mineral salts.

8/ Conclusion:

Through thisscientificexperience we know that the process of photosynthesis is the most important biological processes that are on the surface of the globe, and this process many of the necessary conditions provided in the external and internal environment of the plant so that the process of photosynthesis, and there are many factors for the incidence of the process.