"Respiration of Green Plants" Green Plants and Carbon-Oxygen Balance in the Biosphere PPT Courseware

Description

"Respiration of Green Plants" Green Plants and Carbon-Oxygen Balance in the Biosphere PPT Courseware

Knowledge review

The formula for photosynthesis:

Carbon dioxide + water Light/chloroplast Organic matter (starch) + oxygen

1. The site of photosynthesis is chloroplasts

2. The raw materials for photosynthesis are carbon dioxide and water

3. The condition for photosynthesis is sunlight (light energy)

4. The products of photosynthesis are organic matter and oxygen

5. The material transformation of photosynthesis is inorganic matter-organic matter

6. The energy transformation of photosynthesis is light energy - chemical energy

1. Teaching purpose

Knowledge

Understand the respiration phenomenon of seeds

Ability

1 Cultivate students' ability to observe carefully, be diligent in using their brains, and be good at discovering problems.

2. Ability to analyze experimental phenomena and summarize experimental conclusions.

Emotional aspect

Cultivate a rigorous scientific attitude and establish a pragmatic scientific spirit in the process of scientific experiments.

2. Key points, difficulties and teaching methods of teaching materials

Focus: Respiration phenomenon of plants

Difficulty: Plant cells all perform respiration

Teaching method: Demonstration experiment method Observation method Analysis method

Introduce new lessons

The energy stored in the organic matter produced by photosynthesis of green plants can only be used after it is decomposed.

How is the decomposition of organic matter accomplished? Let's consider this interesting question:

1. The process of green plant respiration

think about it

Why do seeds that have been stored for a long time get hot?

Why is there a hole in the bottom of the flower pot?

Why do radishes become hollow after being stored for a long time?

These phenomena are common in daily life, but can you tell the specific reasons? Let's learn about plant respiration through experiments.

Demonstration 1; Thoughts and Discussion

What is the change in the temperature of the two thermos flasks?

The temperature of the thermos on the left has increased, but the temperature of the thermos on the right has not changed.

Can cooked seeds breathe? Why?

cannot

The cells are dead and have no vitality.

Analyzing the experimental phenomena, what conclusion did you draw?

Germinating seeds generate heat when they respire

respiration

Definition of respiration:

The process in which cells use oxygen to decompose organic matter into carbon dioxide and water and release the energy stored in the organic matter to supply the needs of life activities is called respiration.

Expression for respiration:

Organic matter + oxygen---carbon dioxide + water + energy

(stores energy)

The place of respiration: Respiration mainly takes place in mitochondria

Are respiration and respiration the same?

Respiration emphasizes the process of gas exchange between organisms and the external environment.

Respiration emphasizes the process by which organic matter breaks down to release energy.

2. Respiration is a common characteristic of living things

Respiration is a common feature of living things

In addition to their own use, the organic matter produced by green plants also enters other organisms through the food chain, participates in the construction of other organisms, and provides energy for the life activities of other organisms. In these organisms, the methods of decomposing organic matter and providing energy are basically similar, both through cellular respiration. In other words, respiration is a common feature of living things. Its essence is the decomposition of organic matter and the release of energy. Any living cell is constantly respiration. Once respiration stops, it means the end of life.

Apply what you learn

1. Young leaves have stronger respiration than old leaves, and flowers have stronger respiration than leaves. Why?

Young leaves have more vigorous life activities than old leaves, and flowers have more vigorous life activities than leaves.

2. Why do we need to loosen the soil frequently when planting flowers or crops?

Frequent loosening of the soil provides sufficient oxygen to the roots.

3. Why do sweet potatoes and cabbage get hot after being piled up for a long time? Why do cellars for storing sweet potatoes and cabbage have to have ventilation holes?

Sweet potatoes and cabbage continuously respire and generate a lot of heat. If there are no ventilation holes and no heat dissipation, the temperature in the cellar will rise, causing sweet potatoes and cabbage to rot.

3. The role of green plants in maintaining the carbon-oxygen balance of the biosphere

discuss

1. Will the carbon-oxygen balance be disrupted? Under what circumstances will it be broken? How should we prevent it?

Burning too much coal, oil, and natural gas

Seek international cooperation to limit carbon dioxide emissions;

Indiscriminate deforestation and afforestation are prohibited.

2. What impact has the increase in carbon dioxide had on the environment?

greenhouse effect

3. As a member of the biosphere, what should we do to keep our living environment and the air always fresh?

Plant trees, protect vegetation, reject disposable chopsticks

Sharing rides, walking, cycling

reasoning process

1. The amount of organic matter produced by melons in the two places through photosynthesis is basically the same.

2. The melons in Land A consume less organic matter than those in Land B.

3. The respiration of melons from place A is weaker than that of melons from place B.

4. Because the night temperature in site A is lower than that in site B, it shows that the ambient temperature has an impact on the respiration of plants. Within a certain range, the higher the ambient temperature, the stronger the respiration of plants.

test you

1. The part of the plant that performs suction is ( )

A. Only in leaves B. Only in germinated seeds

C. Only in the root system D. Can be carried out in all living cells

2. The time it takes for plants to perform respiration is ( )

A.Only during the day B.Only under the light

C. During the day and night D. Only at night

3. If you water the flowers too frequently, the flower soil always contains a lot of water, which will cause the roots to rot and the plants to die. The reason is. ( )

A. Too much water and the root hairs cannot absorb it

B． Too much water and the roots cannot breathe

C. Too much water allows cells to multiply, causing roots to rot.

D. Roots absorb too much water and die

4. Plants inhale carbon dioxide and release oxygen during the day, and inhale oxygen and exhale carbon dioxide at night. This is because ( )

A. Photosynthesis occurs in sunlight and respiration stops

B． Photosynthesis is stronger than respiration

C. Respiration occurs at night and photosynthesis ceases at night

D. Leaves perform photosynthesis but not respiration

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For more information about the PPT courseware "Respiration of Green Plants Green Plants and Carbon-Oxygen Balance in the Biosphere", please click the Respiration of Green Plants ppt Green Plants and Carbon-Oxygen Balance in the Biosphere ppt tag.

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Update Time: 2024-07-06

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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