Microbe Beginnings

Overview

In this first lesson of “Baking Science: Yeast Unleashed”, students explore how microorganisms live and work in interconnected environments. They focus on yeast as a microorganism they will investigate further through baking.

Learning intentions

• WALT: Understand the role of microorganisms in the environment.
• WALT: Describe life processes of microorganisms and identify abiotic and biotic factors that affect them.
• WALT: Explain how yeast’s life processes relate to conditions in an environment (e.g., food, temperature, moisture, oxygen).

Success criteria

• I can identify at least three types of microorganisms (e.g., bacteria, fungi/yeast, viruses).
• I can describe the role/life process of each type in an environment.
• I can link at least one environmental factor (abiotic or biotic) to a microorganism’s life process, using observations/examples.
• I can explain why yeast is relevant to baking.

Curriculum links

• AS92020 — Demonstrate understanding of the relationship between a microorganism and the environment (describing life processes and factors; using observations).
• AS91921 — Demonstrate understanding of the use of a range of scientific investigative approaches in a context (students will plan future investigations).
• Science inquiry skills: using observations and communicating science ideas clearly for NCEA Level 1 Science core outcomes.

Lesson structure (75 minutes)

1. 0–5 min · Welcome & unit hook. Teacher shows a short sequence: yeast in warm water/sugar, then compares with room-temperature water; poses: “What changed, and what microorganism might explain it?” Students do a quick stand-and-answer for one guess each.

2. 5–15 min · Activate prior knowledge. Teacher draws a simple three-circle diagram: “microorganism”, “environment”, “life process”. Students brainstorm in pairs what microorganisms are and where they might be found; teacher captures answers as quick notes.

3. 15–25 min · Mini-lesson: microorganism basics. Teacher explains that microorganisms can show life processes (e.g., replication, nutrient use, waste release) even if they’re not always “fully living” by everyday definitions, and introduces yeast as a fungus. Students complete a short guided table: organism → one life process → one role.

4. 25–40 min · Focus task: “Who helps or harms?” sorting cards. Teacher provides card sets showing examples: bacteria (digestion/release of waste), fungi/yeast (nutrient use and replication), viruses (replication inside host cells), plus factor cards (temperature, moisture, nutrients, oxygen, host availability). Students work in groups of 3–4 to sort each microorganism with:

• one abiotic/biotic factor that affects its life process
• a brief role statement (e.g., “Yeast uses nutrients to replicate, helping fermentation in dough”). Teacher circulates, checking accuracy and prompting for links to factors.

5. 40–55 min · Yeast investigation prediction (observations now, test later). Teacher sets up a “prediction wall” for the next lessons: “What will yeast do in warm vs cool dough mixtures?” Students write a prediction and identify the factor they think will matter most (temperature/nutrients/moisture/oxygen), using sentence starters: “I predict ___ because ___.” Teacher collects 5–6 responses to read aloud and refine.

6. 55–68 min · Language check & quick formative assessment. Teacher gives a simplified reading sheet on microorganisms and a labelled diagram of an interconnected environment (e.g., “human gut” or “dough ecosystem”). Students complete a 6-question check:

• identify three microorganisms
• match one life process to each
• name one environmental factor and what it affects. Teacher uses results to form small groups for the rest of the unit.

7. 68–75 min · Exit ticket. Students answer: “Using one example, explain how an environmental factor affects a microorganism’s life process.” Teacher collects tickets at the end.

Resources

• Yeast demonstration materials (safe, classroom-friendly quantities): dry yeast, warm water, sugar, two cups, labels
• Microorganism sorting card set (organism + factor + role/life process prompt)
• Guided table printable (organism → life process → role)
• Simplified reading sheet and labelled diagram of interconnected environments
• Exit ticket slips
• Sentence starters for predictions
• Whiteboard/markers or digital equivalent
• Timers for task segments

Assessment

• Formative checks during sorting task: teacher listens for correct links between life processes and abiotic/biotic factors (AS92020 focus).
• Formative check in the 6-question mini-assessment to confirm students can identify microorganisms and describe roles/life processes.
• Exit ticket to assess understanding of one factor → effect on a life process (AS92020 “describe” and “explain” step).

Differentiation

• Provide visuals and simplified text (ELL): icon-based diagrams for bacteria/fungi/viruses; reduced text paragraphs; sentence starters for predictions and roles.
• Support scaffolds for all learners: word bank (microorganism, life process, abiotic, biotic, nutrients, temperature, oxygen, moisture) and example sentences.
• Targeted support groups: teacher-led mini-conference for students who struggle with the factor-to-life-process link; use “because” prompts and concrete examples from the yeast demo.
• Extension activity (advanced learners within lesson time): after the mini-assessment, invite students to choose one unusual microorganism and complete a 3-line “research brief”: name, where it lives (environment), and one life process it performs.

Extension Activity (advanced learners)

• Unusual microorganism mini-research brief due next lesson: students bring one credible source summary (no links required in class) and must include (1) the organism type, (2) its environment, and (3) one abiotic or biotic factor that affects its life process.