"Exploring the Impact of Environmental Pollution on Biology" The Impact of Human Activities on the Biosphere PPT Courseware 2

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"Exploring the Impact of Environmental Pollution on Biology" The Impact of Human Activities on the Biosphere PPT Courseware 2

Think about it:

1. What kind of rain is acid rain?

2. Are the components of acid rain the same as those used to simulate acid rain in our experiments?

3. Is the acid rain that falls in our area necessarily emitted into the air by our local factories? What does this mean?

1. What is acid rain?

Simply put: acid rain is acidic rain.

The pH of normal rainwater is about 5.6, while the pH of acid rain is less than 5.6.

2. The formation of acid rain

1. Reasons

Acid rain is mainly caused by man-made emissions of large amounts of acidic substances into the atmosphere. Acid rain in our country is mainly caused by the large-scale burning of coal with high sulfur content. In addition, the exhaust gas emitted by various motor vehicles is also an important reason for the formation of acid rain.

2. Process

3. Ingredients

water, sulfuric acid, nitric acid

Acid rain has adverse effects on living things. How to simulate the impact of acid rain on organisms under laboratory conditions? Based on the prompts below, can you design an inquiry plan? Once you have a plan, try to complete it.

hint

You can use vinegar and water to prepare simulated acid rain for experiments and control the pH at 4.

The germination rate of seeds or the growth of seedlings under acid rain conditions can be measured.

Is it necessary to design a controlled experiment? If necessary, how should it be designed?

Does this experiment require quantitative statistics?

If you only conduct one set of experiments, are the results reliable? What do you think should be done to make the experimental results reliable?

Design a table to record the results of observations and experiments.

Experimental steps reference answers

Conduct experiments using acid rain with PH=4, and set clear water as a control

Cultivation of the same number of plant seedlings in two flowerpots A and B

Cultivate in the same suitable environment, spray a certain amount of prepared acid rain into pot A twice a day, spray a certain amount of clean water into pot B twice a day, observe and record once a day

After one week, the growth height of the plant seedlings in the two experimental devices were counted.

What are the dangers of acid rain?

① Acid rain can cause chemical changes in nutrients in the soil, making them unable to be absorbed and utilized by plants.

②Acid rain can acidify rivers and lakes, thereby affecting the growth and development of aquatic organisms such as fish and shrimp, and in severe cases, causing death.

③Acidified water sources threaten human health and affect drinking water;

④ Acid rain directly harms the buds and leaves of plants, and in severe cases can cause the death of entire plants.

How to prevent and control acid rain?

The fundamental measure to control acid rain is to use purification devices to reduce the emissions of pollutants in coal, oil and other fuels, and to do a good job in recycling and utilizing these pollutants.

Greenhouse effect:

Due to the increasing global emissions of carbon dioxide and other gases, the average temperature of the earth continues to rise.

harm:

1. Accelerate the melting of glaciers, gradually raise sea levels, and make typhoons more frequent in some areas.

2. Some areas are becoming more arid, eventually leading to reduced crop yields and the extinction of many species of organisms around the world.

Ozone on the earth is mainly concentrated in the upper atmosphere, forming a thin ozone layer. The ozone layer can effectively filter out ultraviolet rays in solar radiation that are highly damaging to organisms.

Compliance testing:

1. The main reasons for the formation of acid rain in my country are: ( )

A. Burning a lot of gas

B. Burning a large amount of coal with high manganese content

C. Burning a large amount of coal with high sulfur content

D. Burning large amounts of biogas

2. In the following examples, what causes ecological crisis through the food chain is ( )

A. Acid rain

B. Accumulation and concentration of toxic substances such as mercury and cadmium

C. Greenhouse effect

D. Ozone decreases and holes appear in the ozone layer

3. The composition of the atmosphere known as the “protective umbrella of life activities on earth” is ( )

A. Water vapor B. Nitrogen C. Ozone D. Carbon dioxide

4. In recent years, many cities in my country have banned the use of leaded gasoline in cars. The main reason is ( )

A. Improve the combustion efficiency of gasoline

B. Reduce the cost of gasoline

C. Avoid lead pollution of the atmosphere

D. Shortage of lead resources

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"Exploring the Impact of Environmental Pollution on Biology" The Impact of Human Activities on the Biosphere PPT Courseware 5:

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"Exploring the Impact of Environmental Pollution on Biology" The Impact of Human Activities on the Biosphere PPT Courseware 3:

"Exploring the Impact of Environmental Pollution on Biology" The Impact of Human Activities on the Biosphere PPT Courseware 3 Teaching Objectives: 1. Take the hazards of acid rain or waste batteries as examples to illustrate the adverse effects of environmental pollution on organisms. 2. Design and complete a study on the impact of acid rain or waste batteries on organisms..

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Update Time: 2024-07-26

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