Podcast
Questions and Answers
The ______ is a microorganism single-celled fungi called Saccharomyces cerevisiae. It is the main ingredient added to flour to make bread.
The ______ is a microorganism single-celled fungi called Saccharomyces cerevisiae. It is the main ingredient added to flour to make bread.
yeast
What happens when you knead the dough?
What happens when you knead the dough?
- The dough becomes smoother, more elastic and it absorbs more air. (correct)
- The dough becomes tougher and less sensitive to heat, air.
- The dough becomes softer and more sensitive to cold.
- The dough becomes more compact and dense.
Why do think that the hotter the dough, the faster it rises?
Why do think that the hotter the dough, the faster it rises?
The yeast is more active at higher temperatures.
If you leave the dough growing for a few more hours, will the yeast activity continue or will it stop?
If you leave the dough growing for a few more hours, will the yeast activity continue or will it stop?
The temperature in the refrigerator at 4-5°C is the most active for yeast.
The temperature in the refrigerator at 4-5°C is the most active for yeast.
At what temperature is the yeast most active?
At what temperature is the yeast most active?
What are the variables in this experiment?
What are the variables in this experiment?
Which hypothesis was correct?
Which hypothesis was correct?
What are the possible controls in many ecological and geological investigations?
What are the possible controls in many ecological and geological investigations?
According to your observations, what is the role of temperature in this study?
According to your observations, what is the role of temperature in this study?
Match the following terms with their definitions:
Match the following terms with their definitions:
Flashcards
Scientific Method
Scientific Method
A series of steps scientists use to investigate natural phenomena.
Observation
Observation
Careful noting of something in natureÂ
Problem Statement
Problem Statement
A specific question a scientist wants to answer.
Hypothesis
Hypothesis
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Variable
Variable
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Control Group
Control Group
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Constant
Constant
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Experiment Setup
Experiment Setup
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Data Analysis
Data Analysis
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Conclusion
Conclusion
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Observational Study
Observational Study
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Temperature's effect
Temperature's effect
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Study Notes
Scientific Method - Yeast and Dough
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Scientific Research Steps:
- Make observations.
- State a problem.
- Formulate a hypothesis.
- Design an experiment.
- Analyse results.
- Share conclusions.
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Yeast Experiment:
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Materials:
- Fresh yeast tablets
- Flour
- Water
- 3 containers
- Marker
- Thermometer
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Procedure:
- Dilute 25g yeast in 200cm³ warm water
- Combine flour, water, and yeast, knead dough
- Divide dough into 3 pieces, place in containers
- Mark heights, place containers in different temps
- Refrigerator (4-5°C)
- Room temperature
- Water (60-70°C)
- Record height every 5 minutes.
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Variables (in experiment):
- The independent variable is the temperature.
- Variables kept constant: amount of dough, humidity, light, and time.
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Hypothesis Example: "The hotter the dough, the faster it rises."
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Analysis:
- Observe most active yeast temperature (4-5°C, room temp, or 60-70°C).
- Observe how long yeast keeps activating in 60°C and fridge samples after reaching room temp.
- Determine the correct hypothesis of the most suitable temp
Variables and Observational Studies
- Variables in Experiments:
- Independent variable: changed to see its effect
- Dependent variable: measured to see the effect of independent
- Controlled variable: remain same in all trials.
- Field Studies:
- Ecological, geological studies
- Observing in natural environment
- Variables difficult to control
Temperature and Plant Growth (Observation Study)
- Example: The image shows plant growth at different elevations.
- Temperature Role: Altitude affects temperatures.
- The role of temperature in this study is to observe how plants grow at different natural temperatures.
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