Lesson Plan | Active Learning | Food Production by Microorganisms

Assumptions: This Active Lesson Plan assumes: a 100-minute class, prior student study with both the Book and the start of Project development, and that only one activity (among the three suggested) will be chosen to be conducted during the class, as each activity is designed to take up a significant portion of the available time.

Objectives

Duration: (5 - 10 minutes)

The Objectives stage is fundamental to directing the focus of students and the teacher towards the essential learning goals of the lesson. By clearly establishing what is expected to be achieved, this section serves as a guide for all subsequent activities, ensuring that both the preparation and execution of the lesson are aligned with a deep understanding of the life cycle of food production by microorganisms, with a special emphasis on yeast production for bread.

Main Objectives:

1. Empower students to understand the role of microorganisms in the food production cycle, focusing on yeast production for bread.

2. Develop the ability to relate theory to practice by understanding and explaining how microorganisms transform ingredients into food products.

Side Objectives:

1. Stimulate critical thinking through questioning about the biological processes involved in food production.
2. Encourage students' curiosity and interest in natural sciences through practical and relevant examples.

Introduction

Duration: (15 - 20 minutes)

The Introduction phase serves to engage students with real-life situations and problems involving the theme of the lesson, making them revisit and apply their pre-acquired knowledge in a practical and contextualized manner. The problem situations are designed to stimulate critical thinking and the direct application of content in everyday scenarios. The contextualization, in turn, seeks to connect theoretical content with the real world, increasing interest and relevance in the study of microorganisms in food production.

Problem-Based Situations

1. Imagine that you are a baker and need to prepare bread to sell in your bakery. However, you realize that you do not have yeast. How would you solve this problem knowing that yeast is a fungus that helps the dough rise?

2. Think of a scenario where a person wants to make yogurt at home. They have milk but do not know how to turn it into yogurt. What is the role of microorganisms in this process and how could they use them to obtain the desired yogurt?

Contextualization

Food production by microorganisms is not just a scientific curiosity; it is an essential practice that dates back thousands of years and still sustains many food industries around the world today. For example, fermentation, a controlled process of transforming organic substances by enzymes from microorganisms, is fundamental for the production of breads, beers, wines, cheeses, and many other foods. Curiosities like the accidental discovery of penicillin by Alexander Fleming in 1928, which revolutionized medicine and is produced by a fungus, help illustrate the impact and importance of microorganisms in everyday life.

Development

Duration: (65 - 75 minutes)

The Development phase is designed to allow students to practically and playfully apply the concepts studied about food production by microorganisms, with a special focus on yeast production for bread. Through hands-on activities, students will be able to directly observe fermentation processes and understand how microorganisms transform simple ingredients into complex food products. This approach not only facilitates learning but also stimulates curiosity and critical thinking among students.

Activity Suggestions

It is recommended to carry out only one of the suggested activities

Activity 1 - Magic Bread: The Adventure of Fermentation

> Duration: (60 - 70 minutes)

- Objective: Understand the fermentation process and how microorganisms, especially yeast, are essential in bread production.

- Description: In this activity, students will simulate bread production using simple ingredients such as flour, water, and sugar, along with yeast. The goal is to observe and measure the fermentation process, understanding how microorganisms transform the dough and make it rise.

- Instructions:

• Divide the class into groups of up to 5 students.

• Distribute the necessary ingredients and utensils: flour, water, sugar, yeast, bowls, spoons, and scales for measurement.

• Ask each group to mix the ingredients in specific quantities according to the provided recipe.

• Instruct the students to observe and record the changes in the dough over time, measuring the volume and height of the dough every 30 minutes.

• After 2 hours, each group should bake their dough to see the final result of the fermentation process.

• Lead a class discussion about what the students observed, comparing the different doughs and discussing the role of yeast in bread rising.

Activity 2 - Yogurt Explorers: A Journey into the World of Lactobacilli

> Duration: (60 - 70 minutes)

- Objective: Understand the role of lactobacilli in milk fermentation and yogurt production, as well as explore yogurt's importance in nutrition.

- Description: Students will explore yogurt production using milk and lactobacillus bacteria cultures. They will create their own yogurt in small containers, observing changes in texture and flavor throughout the fermentation process.

- Instructions:

• Organize the students into groups and provide each with milk, natural yogurt (as a source of bacteria cultures), thermometers, and small pots.

• Instruct the students to heat the milk to approximately 45ºC, mix in the natural yogurt, and transfer to the pots.

• Ask the students to cover the pots and keep them in a warm environment for 8 hours.

• After fermentation time, the students should refrigerate the yogurt and then taste and describe the changes observed in texture and flavor.

• Lead a discussion about how lactobacilli bacteria transform milk into yogurt, highlighting health benefits.

Activity 3 - Beer Detectives: Investigating Fermentation

> Duration: (60 - 70 minutes)

- Objective: Explore the principles of fermentation in beer production, understand the transformation of sugars, and observe the effects of fermentation.

- Description: In this activity, students will investigate the fermentation process in beer production using non-alcoholic ingredients. They will observe gas formation and flavor changes in a barley wort, simulating the beer production process.

- Instructions:

• Divide the class into small groups and provide each with barley wort, sugar, yeast, balloons, and PET bottles.

• Instruct the students to mix the wort with the sugar and yeast in a PET bottle, sealing it with a balloon, which will act as an indicator of gas production.

• Ask the students to observe changes in the balloon over 24 hours and record their observations.

• After fermentation time, the students should open the bottle and taste the liquid to observe flavor changes.

• Lead a discussion about how fermentation transforms sugars into alcohol and carbon dioxide, and how this process is used in beer production.

Feedback

Duration: (15 - 20 minutes)

The purpose of this feedback stage is to allow students to articulate and share the knowledge acquired through practical activities. Additionally, it aims to consolidate students' understanding of food production by microorganisms, especially yeast production for bread, through collective reflection. This discussion helps reinforce learning, identify misunderstood concepts, and stimulate critical thinking and effective communication.

Group Discussion

After conducting the practical activities, gather all students for a group discussion. Start the discussion with a brief introduction, highlighting the importance of the experiences they just conducted and how these activities relate to the process of food production by microorganisms. Encourage each group to share their discoveries, challenges encountered, and what they learned from the activity.

Key Questions

1. What were the main transformations you observed in the ingredients during the fermentation process?

2. How do microorganisms, such as yeast and bacteria, contribute to the production of breads, yogurts, and beers?

3. Was there any significant difference between the final products of each group? If so, what might have influenced those differences?

Conclusion

Duration: (10 - 15 minutes)

The purpose of the Conclusion stage is to reinforce and consolidate the knowledge acquired during the lesson, ensuring that students can clearly articulate what they learned. Additionally, it aims to highlight the applicability of the studied concepts in everyday life, encouraging students to perceive science as an integral part of their lives and the importance of a well-founded scientific education. This final reflection helps close the lesson with a clear understanding and a renewed appreciation for the studied theme.

Summary

In this final stage, the teacher will summarize the main points addressed during the lesson, reiterating how microorganisms, especially yeast, play a crucial role in the production of foods such as breads, yogurts, and beers. The observations made by students during practical activities will be recapitulated, emphasizing the transformations that occur during fermentation and the importance of maintaining ideal conditions for the growth of these organisms.

Theory Connection

Today's lesson was structured to connect theory and practice in an integrated manner, allowing students to see the studied concepts in action. Through practical activities such as simulated bread and yogurt making, students were able to directly experience the fermentation process, solidifying their theoretical understanding through concrete and contextualized experiences.

Closing

To conclude, the teacher will highlight the relevance of microorganisms in everyday life, emphasizing how the knowledge acquired not only broadens students' scientific understanding but also gives them a deeper appreciation of the importance of biological processes in the production of foods we regularly consume. This understanding is essential for both scientific education and awareness of healthy eating practices.