Mystery Lesson Plan Life's Big Mystery
Small Group Special Education Lesson Plan
Duration 45 min
Learning Objective
Students will learn that living things come from other living things (biogenesis ) rather than arising spontaneously (spontaneous generation ). By sorting examples, observing a broth experiment, and discussing results, they'll reinforce scientific reasoning and vocabulary.
Why This Matters
Understanding how life originates builds foundational biology knowledge and critical thinking. This lesson clarifies common misconceptions and strengthens observational skills, supporting IEP/504 goals with visuals and structured support.
Teacher Preparation
Print and cut out cards for Origin Sorting Game
Preview Slide Deck and Lesson Script
Print copies of Sorting Worksheet and Observation Sheet
Arrange seating for small groups and post visuals
Gather jars or experiment pictures if available
Lesson Materials
Life's Big Mystery Slide Deck
Life's Big Mystery Lesson Script
Origin Sorting Game Cards
Sorting Worksheet & Observation Sheet
Instructional Sequence
1
Engage and Introduce Concept
5 minutes
Display Slide 1 showing jars of broth and microorganisms.
Read Script Lines 1–5 using simple, clear language.
Ask: “Where do you think the tiny life in this jar came from?”
Provide sentence starters on the board: “I think...”, “I see...”
2
Sorting Activity
10 minutes
Divide students into pairs and distribute Origin Sorting Game Cards .
Instruct students to sort cards into: Biogenesis (life from life) vs Spontaneous Generation (life from non-life).
Prompt: “Why did you place this card here?”
Use visual cues and provide positive reinforcement (thumbs-up icons).
3
Observation Activity
15 minutes
Hand out Microbe Growth Observation Sheets .
Show photos/models of boiled (sterile) vs. unboiled (microbe-rich) broth.
Students draw/circle observations and label with simple words or pictures.
Offer sentence stems: “I see...”, “I think this happened because...”
4
Group Discussion
10 minutes
Reconvene and display Summary Slide .
Ask: “Which broth had life, and why?” and “What does this tell us about where life comes from?”
Encourage turn-taking using visual speaking tokens.
Reinforce vocabulary: biogenesis and spontaneous generation.
5
Wrap-Up and Assessment
5 minutes
Hand out Sorting Worksheet as an exit ticket.
Students complete 1–2 simple matching or circling questions.
Read questions aloud and allow extra processing time.
Reinforce takeaway: “Life comes from life.”
Mystery Slides Life's Big Mystery
Where does tiny life come from?
Scientific Investigation
Two Big Ideas
Biogenesis
Life comes from other living things .
Chick → Egg
Seed → Plant
Mold → Bread
Spontaneous Generation
Life comes from non-living things.
Mice ← Grain
Frogs ← Mud
Maggots ← Meat
Sorting Activity
Work with your partner to sort the cards into two piles.
BIOGENESIS
SPONTANEOUS
Observation Time
BOILED
(Sterile Broth)
No movement. Clear liquid.
UNBOILED
(Open to Air)
🦠 🔬 🦠 🦠
Tiny life appears! Cloudy liquid.
Draw what you see on your Observation Sheet!
Group Discussion
Which broth had life? Why?
What does this tell us about where life comes from?
Use Your Voice
Listen Proudly
Exit Ticket
Complete the matching and circling questions on your worksheet.
Life comes from life!
More Real-Life Examples
Biogenesis
🐣 Chickens from eggs
🌻 Flowers from seeds
🍄 Mold from old bread
Spontaneous Generation Myths
🪰 Maggots from meat
🐀 Mice from grain
🐸 Frogs from mud
Mystery Lesson Script Life's Big Mystery Script
Guided Lesson Dialogue & Facilitation Notes
1
Slide 1: Intro Mystery
1. Say: “Good morning, friends! Today we have a big mystery to solve: Where does tiny life come from?”
2. Say: “Look at these jars of broth on the screen. Do you see all those little dots? Those are tiny living things—microbes!”
3. Say: “Here’s our question: Where do you think the tiny life in these jars came from?”
Facilitation Tip
Pause. Provide sentence starters on the board: “I think...” / “I see...” Allow extra processing time for students to formulate thoughts.
4. Say: “Thank you for sharing! Hold on to your ideas as we learn more.”
2
Slide 2: Big Science Words
5. Say: “Now I’ll teach you two science words: ‘biogenesis’ and ‘spontaneous generation.’”
6. Say: “Biogenesis means life comes from other living things. Can you say ‘biogenesis’ with me?” (Pause for choral response)
7. Say: “Spontaneous generation means life comes from non-living stuff. Let’s say ‘spontaneous generation’ together.” (Pause for choral response)
8. Say: “So, biogenesis = life from life. Spontaneous generation = life from non-life.”
9. Say: “Great job! Keep these words in mind for our activities.”
3
Slide 3: Sorting Game
10. Say: “It’s time for a sorting game! I’ll give each group a set of cards with pictures and words.”
11. Say: “Your job is to sort the cards into two piles: one for biogenesis (life from life) and one for spontaneous generation (life from non-life).”
12. Say: “As you sort, ask your partner: ‘Why did you place this card here?’ Be ready to share your reason when I visit your group.”
4
Slide 4: Broth Observation
13. Say: “Now we will observe two jars of broth—one boiled, one unboiled.”
14. Say: “On your Microbe Growth Observation Sheet, draw or circle what you see in each jar. Use pictures or simple words.”
15. Say: “Then complete the sentence: ‘I see... because...’ You can start with ‘I see...’ and ‘I think this happened because...’”
Teacher Check-In
Circulate around the room. Support students with visuals and point to specific parts of the jars to guide their drawing.
5
Slide 5: Discussion
16. Say: “Let’s come back together. Which jar had tiny life, and why?”
17. Say: “Who can use the word ‘biogenesis’ to explain what happened?”
18. Say: “Who can use ‘spontaneous generation’ to explain why nothing grew in the other jar?”
19. Say: “Excellent answers! What does this tell us about where life comes from? Yes—life comes from life!”
Origin Sorting Game Cards Origin Sorting Game Cards
Cut along the dotted lines. Use these cards for the sorting activity.
BIOGENESIS
Life from Life
SPONTANEOUS
Life from Non-Life
🌱
Seeds growing into plants
🐣
Baby chicks hatching
🍞
Mold growing on old bread
🥩
Maggots appearing on meat
🌾
Mice appearing in grain
🐸
Frogs appearing in mud
🐶
A puppy born from a dog
🥣
Bacteria in unboiled soup
🐈
Kittens born from a cat Origin Sorting Worksheet Name:
Date:
Origin Sorting
Exit Ticket Worksheet
1 Circle the correct science word for each example:
Seeds growing into plants
Biogenesis
Spontaneous Generation
Maggots appearing on meat
Biogenesis
Spontaneous Generation
Bacteria in unboiled broth
Biogenesis
Spontaneous Generation
Baby chicks hatching from eggs
Biogenesis
Spontaneous Generation
2 Match the words to their meanings:
1. Biogenesis
2. Spontaneous
A. Life comes from living things.
B. Life comes from non-living things.
3 Short Answer Question:
Why did no microbes grow in the boiled broth? Use the words biogenesis or spontaneous generation in your answer.
Life comes from life!
Microbe Growth Observation Sheet Microbe Growth
Observation Sheet
Name
Date
Look at the two jars of broth. Draw what you see in each jar.
Jar 1: Boiled
Draw Here
Jar 2: Unboiled
Draw Here
Complete the sentence:
I see tiny life in
because...
Helper Words: biogenesis microbes boiled unboiled
Life Origins Discussion Guide Life Origins Discussion
Guided Conversation & Sentence Starters
Discussion Rules
Speak one at a time using our talking token.
Listen respectfully when others share.
Use sentence starters to help your thoughts.
Big Takeaway
Life comes from life!
1. Boiled vs. Unboiled Broth
“What did you notice in the unboiled broth that you didn’t see in the boiled broth? Which term explains why life appeared only in the unboiled jar?”
Sentence Starter:
“I see ________ because ________.”
2. Sorting Game Reflection
“Which cards were easy to sort into Biogenesis? Why does mold on old bread come from biogenesis instead of spontaneous generation?”
Sentence Starter:
“This card goes in biogenesis because ________.”
3. Real-Life Connections
“Think of other examples of biogenesis in nature. How do these examples help you remember the term biogenesis?”
Sentence Starter:
“For example, ________ shows biogenesis because ________.”
4. Historical Perspectives
“Long ago, people believed in spontaneous generation. Why might they have thought life could appear from non-living things?”
Sentence Starter:
“They thought ________, but our experiment shows ________.”
