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Authoritative PPT Summary
"The Release of Energy in Food" PPT teaching courseware
Part One: Situation Import
Where does the energy we need for life activities mainly come from?
learning target
1. Learn the basic methods of measuring food energy and explain the commonalities and differences in the nature of combustion and respiration.
2. Explain that energy comes from the decomposition and oxidation of organic matter in cells, and clarify the essence and significance of respiration.
3. Be able to understand the methods of detecting oxygen and carbon dioxide.
Release of energy in food PPT, Part 2: Energy stored in food
Food caloric value: The energy released per gram of food when it is fully burned outside the body.
Explore the energy stored in food
The energy in food can be released outside the body through ______. 100g of water needs to absorb 4.187 joules (J) of energy to raise the temperature by 1°C. The energy in food can be measured and calculated by measuring the heat released by a certain amount of food to __________ a certain amount of water.
think about it
1. In the formula, what does food quality mean? How can this mass be measured or calculated? What are your methods? How many methods are there?
2. In the formula, how is the released energy obtained? If energy is released by burning, how much energy is released? How do you measure or calculate?
PPT on the release of energy in food, part 3: Cells release energy through respiration
1. Put the burning candles into bottles A and C respectively, and record the burning time of the candles.
Phenomenon: A burning candle goes out faster when placed in bottle C.
Conclusion: Compared with air, human exhaled gas contains less oxygen.
2. Pour 50mL of clear lime water into bottles B and D respectively, and compare the turbidity of the liquids in the two bottles.
Phenomenon: The lime water in bottle D appears turbid.
Conclusion: Compared with air, human exhaled gas contains more carbon dioxide.
PPT on the release of energy in food, part 4: on-site training
1. The essence of respiration is ( )
A. Inhale oxygen and exhale carbon dioxide
B. Inhale carbon dioxide and exhale oxygen
C. Oxidize organic matter and release energy
D. Store more energy in organic matter
2. Regarding the description of respiration of humans and green plants, the correct statement is ( )
A. Both need to inhale carbon dioxide
B. People inhale oxygen and green plants release carbon dioxide
C. All need to inhale oxygen
D. People inhale carbon dioxide, and green plants inhale oxygen.
Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, PPT download on the release of energy in food, .PPT format;
For more information about the PPT courseware "Energy Supply of the Human Body and the Release of Energy from Food", please click the "Energy Supply of the Human Body ppt Release of Energy from Food" ppt tag.
"The Release of Energy in Food" PPT free download:
"The Release of Energy in Food" PPT free download Part 1: Learning objectives 1. The essence and significance of respiration. 2. Methods to detect oxygen and carbon dioxide. Important and difficult points 1. Key points: the essence and significance of respiration. 2. Difficulty: Detecting oxygen and dioxide...
"The Release of Energy in Food" PPT courseware download:
"The Release of Energy in Food" PPT courseware download Part One: Course Knowledge Points Knowledge Point 1 Energy is stored in food 1. Explore the difference in energy stored in different foods (1) Make a simple calorimeter. There are two issues to pay attention to when determining the production plan,...
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