Bread Making in Microbiology WebQuest

1. Student Information

Student Name

Class

Teacher

Date

2. Introduction

Imagine entering a bakery and smelling fresh bread. That delicious loaf did not rise by chance. Tiny living organisms called yeast play a major role in bread making. These microorganisms break down sugars and release carbon dioxide gas, causing dough to expand. In this activity, you will become a food microbiologist and investigate how bread making depends on microbial activity.

Big Question

How does yeast make bread rise, and why is bread making an example of applied microbiology?

Microorganism Focus

Saccharomyces cerevisiae (baker's yeast)

Scientific Concept

Fermentation, respiration, carbon dioxide production, and food biotechnology

3. Task

By the end of this WebQuest, you should be able to:

Explain the role of yeast in bread making.

Describe fermentation and identify its products.

Compare conditions that increase or reduce yeast activity.

Apply microbiology vocabulary accurately in written responses.

4. Process

Read the background information and explore the listed resources.
Complete all questions in the investigation section.
Analyse the science of fermentation in bread dough.
Complete the final reflection and conclusion.

5. Recommended Resources

🎥 Watch: How Bread Rises (Yeast & Fermentation)

Focus: Observe how yeast produces gas and causes dough to rise.

What is Yeast?

https://kids.britannica.com/kids/article/yeast/442746

Focus: What type of organism yeast is.

How Bread Rises

https://www.sciencefocus.com/nature/why-does-yeast-make-bread-rise

Focus: Gas production and dough expansion.

Fermentation (Khan Academy Video)

https://www.khanacademy.org/.../yeast

Focus: Chemical process and products.

Bread & Fermentation

https://kids.britannica.com/students/article/bread/273343

Focus: How fermentation works in bread.

Yeast & Bread Science

https://en.wikipedia.org/wiki/Baker's_yeast

Focus: Conditions for yeast growth.

6. Investigation Questions (Use Resources Above)

Tip: Each question is linked to a resource. Use the focus hints to guide your research.

1. What type of microorganism is yeast?

2. State the scientific name of baker's yeast.

3. Explain what fermentation is in the context of bread making.

4. What gas is produced by yeast during bread making?

Oxygen Carbon dioxide Nitrogen Hydrogen

5. Why does dough rise when yeast is active?

6. Which conditions are most suitable for yeast activity? Select all that apply.

Warm temperature Very high heat Moisture Sugar as a food source Complete dryness

7. Predict what would happen if dough is placed in an environment that is too hot.

8. Bread making is an example of:

Pathogenic microbiology Industrial/food microbiology Medical imaging Genetic inheritance only

9. Describe two ways in which bread making demonstrates the usefulness of microorganisms to humans.

10. Write a short paragraph explaining the full role of yeast in bread making.

7. Mini Data Analysis

Imagine the following investigation measured dough rise at different temperatures.

Temperature (°C)	Amount of Dough Rise After 1 Hour (cm)
5	0.5
20	2.5
30	4.8
45	1.2

11. Which temperature produced the greatest rise?

12. What does the table suggest about the effect of temperature on yeast activity?

13. Why might the dough rise less at 45°C than at 30°C?

8. Final Reflection

What is the most important microbiology idea you learned from this WebQuest?

How confident are you now in explaining bread making as a microbiological process?

9. Assessment Rubric

Criteria	Excellent	Satisfactory	Needs Improvement
Scientific Accuracy	Explanations are accurate, detailed, and use correct terminology.	Most explanations are accurate with minor errors.	Responses show major misconceptions or weak understanding.
Application of Microbiology Concepts	Clearly connects bread making to fermentation and microbial activity.	Shows some connection to microbiology concepts.	Connections are unclear or missing.
Completion of Tasks	All sections are completed thoroughly.	Most sections are completed.	Several sections are incomplete.

10. Conclusion

Bread making is more than a cooking activity. It is a practical example of microbiology in everyday life. Yeast, a living microorganism, carries out fermentation, producing carbon dioxide that makes dough rise. This shows that microorganisms are not only important in disease but also in food production and biotechnology.

Your WebQuest has been completed. Please review your answers and save or print your work.