"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 3

Description

"Respiration of Green Plants" Carbon-Oxygen Balance in Green Plants and the Biosphere PPT Courseware 3

learning target

1. Describe the respiration of green plants and outline the process of respiration.

2. Explain the difference and connection between photosynthesis and respiration, and give examples of the relationship between respiration and human production and life.

3. In the process of conducting inquiry experiments, students’ abilities of guessing, reasoning, observation, generalization and creative thinking are initially developed.

4. Let students experience the general process of scientific inquiry and cultivate their rigorous, realistic, and collaborative spirit.

Teaching focus

1. Respiration phenomenon of plants;

2. Experiments to explore the respiration of plant cells;

3. The concept and significance of respiration.

Teaching difficulties

1. Design of respiration experiment;

2. Transformation of matter and energy during respiration.

Experimental phenomena:

The temperature inside the thermos containing the germinated seeds rises. The temperature inside the thermos bottle containing cooked seeds does not rise

Experimental proof:

Germinating seeds give off heat.

During the germination process of seeds,

Organic matter changes, releasing energy

Part of the energy is used for seed germination,

Some energy is lost as heat

Think about it: Where does the energy released by a seed during germination come from?

The energy released during seed germination comes from the energy stored in organic matter during photosynthesis.

Explanation: Germinated seeds perform respiration and decompose organic matter.

Experimental phenomenon: The gas in the bottle containing germinated seeds can make the clear lime water turbid.

Experiments have shown that germinating seeds release carbon dioxide.

Scientific experiments have proven that when organic matter is completely decomposed, it not only produces carbon dioxide, but also water.

2. Respiration is a common characteristic of living things

The decomposition of organic matter in plants and animals and the provision of energy are achieved through cellular respiration.

Respiration is a common characteristic of living things.

The meaning of respiration

1. The energy required for various life activities of plants comes from respiration.

2. Respiration provides raw materials for the synthesis of other compounds in the body.

The essence of respiration:

Organic matter decomposes, releasing energy.

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 the air in our living environment 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

think

1. Electric lights have been installed in the cellar where vegetables are stored. Why do farmers still hold lit candles in their hands when entering the cellar?

Lighted candles can test whether there is oxygen in the cellar, preventing plant respiration in the cellar from consuming too much oxygen and suffocating people if they enter.

2. Why do radishes that have been stored for a long time become hollow?

Respiration consumes large amounts of organic matter.

3. Why do corn and rice need to be dried before being put into warehouses?

Reduce moisture and reduce respiration

4. Grains or vegetables in storage will cause certain losses due to respiration. In order to reduce respiration and reduce losses, what measures should be taken?

——Preserve at low temperature, vacuum packaging, reduce temperature and oxygen concentration.

——Keep dry and reduce 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: 2024-11-17

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

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