"The Role of Green Plants in the Biosphere" PPT courseware

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"The Role of Green Plants in the Biosphere" PPT courseware

Part One: Teaching Objectives

1. Describe that green plants provide food and energy for living things; understand that green plants are "energy converters".

2. Understand that green plants help maintain the carbon-oxygen balance in the biosphere; understand that green plants are automatic "air purifiers."

3. Describe the water cycle process in the biosphere and the role of green plants in the biosphere water cycle; understand that green plants are natural "reservoirs".

4. Develop an awareness of loving and protecting green, and participate in activities to green your home.

Observe and think

(1) Which of the organisms in the picture below can directly use light energy to synthesize organic matter?

(2) What do animals feed on? Where does the energy in its body come from?

(3) Ask students to think and guess where the nutrients of the mushrooms and fungus we usually eat come from?

(4) Summarize how solar energy is used by organisms in the biosphere?

PPT on the role of green plants in the biosphere, part 2: exploration of new knowledge

1. Green “energy converter”

In conclusion:

In the biosphere, the ultimate source of energy is solar energy.

Green plants can absorb solar energy and convert it into energy stored in organic matter through photosynthesis. Other organisms directly or indirectly feed on green plants to obtain the energy needed for life activities. Therefore, green plants are the most basic and important components of the biosphere. Green plants can be called the "mother of life."

2. Automatic “air purifier”

Read the textbook and answer the following questions:

1. How do green plants maintain carbon and oxygen balance?

2. What functions do green plants have in purifying the air?

1. Green plants on the earth consume carbon dioxide in the atmosphere through continuous photosynthesis, and the oxygen produced enters the atmosphere in the form of gas. This keeps the concentrations of oxygen and carbon dioxide in the air in a relative balance, that is, green Plants play a decisive role in carbon-oxygen balance.

2. a. Absorb harmful gases; b. Adsorb dust and radioactive pollutants; c. Secrete antibiotics and kill pathogenic bacteria.

The role of green plants in the biosphere PPT, part 3: The role of green plants in the water cycle

1. Plants can slow down the erosion of the land by rainwater, allowing more rainwater to penetrate into the ground and replenish groundwater.

2. The root system and litter of plants have a good fixation and protection effect on the ground soil, which can maintain water and soil and prevent soil erosion.

3. The transpiration of plants can increase atmospheric humidity, increase rainfall, and promote the water cycle of the biosphere.

Connect with reality, transfer and sublime

1. What are the causes of the greenhouse effect and ozone layer destruction?

2. What harm will the greenhouse effect bring to mankind?

The role of green plants in the biosphere PPT, part 4: thinking and practice

Why are green plants said to be the "mother of life"?

Green plants are the basis for the survival of other organisms, because the life activities of various organisms require energy, and this energy comes directly or indirectly from green plants. It can be said that without green plants, there would be no rich and colorful biological world on the earth. Therefore, green plants are the "mother of life."

What is the relationship between the following phenomena and green plants?

These phenomena are related to the reduction of green plants, because the roots and litter of green plants have the function of fixing and protecting the soil and slowing down the erosion of rain on the land; the transpiration of green plants can increase atmospheric humidity and increase rainfall.

The role of green plants in the biosphere PPT, Part 5: Compliance test

1. Which of the following is not a cause of the increase in carbon dioxide content in the atmosphere ( )

A. Population growth and respiration increase

B. Forests declined sharply and photosynthesis decreased.

C. Greenhouse effect, which increases carbon dioxide

D. Extensive use of fuel and increased carbon dioxide emissions

2. The ecological changes caused by the increase in carbon dioxide are ( )

A. Formation of acid rain B. Hole in the ozone layer

C. Greenhouse effect D. Carbon and oxygen balance effect

3. Photosynthesis is of very important significance in the biosphere. Except for which of the following, all the rest are the meaning of photosynthesis ( )

A. provide food for living things

B. Provide energy for the survival of living things

C. Provide carbon dioxide for the survival of organisms

D. Provide oxygen for the survival of living things

Keywords: Free download of Beijing Normal University edition biology PPT courseware for seventh grade volume 1, PPT download of the role of green plants in the biosphere, .PPT format;

For more information about the PPT courseware "The Role of Green Plants in the Biosphere Green Plants and the Biosphere", please click the "The Role of Green Plants in the Biosphere ppt Green Plants and the Biosphere ppt" tag.

"The Role of Green Plants in the Biosphere" PPT:

"The Role of Green Plants in the Biosphere" PPT Part One Content: Situation Introduction Various organisms live in the biosphere, and all organisms need energy. The energy stored in the photosynthesis of green plants is the energy source of almost all organisms. Some people say that green plants are...

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Update Time: 2024-11-22

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 1 industry PPT template

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