Rot and Roll Slides
Decomposer Detective Agency
Case File: #0909
5th Grade Science: Ecosystems
Rot and Roll:
The Ecosystem F.B.I.
Grab your magnifying glasses, detectives! We are diving deep into the underground network of nature's master recyclers.
Investigator Name: ___________________________
Press Space or Arrow Keys to Advance
Active Investigation
Scene: The Forest Floor
The Case of the
Unfinished Leaves
Every autumn, billions of tons of dead leaves, fallen branches, and biological waste fall to the forest floor.
"If nothing ever disappeared, the forest floor would rise 30 feet high in dead leaves within a decade!"
Mystery To Solve:
Who is sweeping this trash away? Where does all of this matter and energy actually go?
1 Clue: Elements are recycled, not destroyed.
2 Suspect: A secret agent squad works 24/7.
Rot and Roll Lesson Slides
Slide 2 of 7
Suspect Lineup
The Squad
Meet Nature's F.B.I.
The primary force responsible for decomposing organic matter and returning nutrients to the soil.
F
Fungi
Mushrooms, molds, and yeasts that secrete powerful fluids to break down rigid materials like wood.
View Details
B
Bacteria
Microscopic single-celled powerhouses that process rotting tissues on a cellular level.
View Details
I
Invertebrates
Insects, worms, pillbugs, and slugs that physically chew, digest, and grind up leaves and wood.
View Details
Rot and Roll Lesson Slides
Slide 3 of 7
Suspect Dossier
F = FUNGI
The Master Chemists
Fungi: Secret Thread Spieces
Fungi aren't plants—they don't make their own food! Instead, they grow microscopic underground threads called mycelium that weave through dead logs and leaves.
- Weapons: Enzymes (fluids) that break down tough structural wood fibers.
- Examples: Bread mold, mushrooms, toadstools, shelf fungi.
- Underground Power: A single fungus colony can stretch across miles of soil!
Detective Focus: Mycelium
The mushroom you see above ground is just the flower of the fungus. The real detective work happens underground. Mycelium fibers dissolve dead things and suck back up the valuable carbon and minerals.
Key Vocabulary:
Mycelium / Enzymes / Chitin
Rot and Roll Lesson Slides
Slide 4 of 7
Suspect Dossier
B = BACTERIA
Microscopic Giants
Bacteria are so small that a single teaspoon of healthy garden soil contains up to one billion of them!
Primary Target:
Soft leaves, fruit peelings, dead plant tissue, organic juices.
The Micro Recyclers
Bacteria: Invisible Cleanup Crew
Bacteria work in enormous, unseen populations to consume soft organic debris. They break down materials down to simple nitrogen, carbon, and phosphorus molecules that can easily dissolve in water.
- Speed: In warm, damp conditions, bacteria divide and multiply every 20 minutes!
- Heat Makers: Their metabolic activity generates so much heat it makes compost piles steaming hot!
Rot and Roll Lesson Slides
Slide 5 of 7
Suspect Dossier
I = INVERTEBRATES
The Mechanical Shredders
Invertebrates: Earth's Excavators
Invertebrates are animals without backbones. They chew up leaves, cardboard, and rotting wood into smaller bits, preparing the surface area for bacteria and fungi to process.
Earthworms
Eat dirt and dead matter; leave nutrient-rich castings.
Pillbugs
Roll up and eat decomposing cellulose material.
Beetles
Carve paths in dead wood, allowing air & water inside.
The Worm Magic
Worms digest material and release castings (poop), which is filled with nutrients like nitrates and potassium. This instantly fertilizes surrounding plants!
Real-World Superpower:
Aeration—digging tunnels lets plant roots breathe oxygen!
Rot and Roll Lesson Slides
Slide 6 of 7
Investigation Complete
Matter Cycle
Case Closed:
Matter Never Dies
Decomposers are the final bridge of ecosystems. They close the loop, proving that waste is never wasted in nature.
1. Produce
➔
2. Consume
➔
3. Recycle
Your Detective Mission:
Open up your FBI Case File Handout. You will track the clues from the slides, profile each suspect group, and catalog the matter cycling cycle!
Step 1: Fill out the suspect profiles
Step 2: Start the Bread Mold Experiment
Rot and Roll Lesson Slides
Slide 7 of 7
FBI Case File Worksheet
Official Case File
Decomposer Detective Agency
Subject: Nutrient Cycling & The Ecosystem F.B.I.
Detective:
Date of Case:
Case # : 5-E-BIO
Part 1: The Crime Scene Investigation
Investigate your surroundings. Every autumn, dead matter falls to the forest floor. If matter was never broken down, what major crisis would occur in this ecosystem? Answer below:
Part 2: The Suspect Profiles (Nature's F.B.I.)
Profile the three primary groups of decomposers that clear the forest debris. Fill out their secrets:
F Fungi
Molds, mushrooms, and yeasts.
Secret Weapon / Tool:
How they process matter:
Ex: Mushrooms, Mold
B Bacteria
Microscopic single-celled agents.
Secret Weapon / Tool:
How they process matter:
Ex: Microorganisms
I Invertebrates
Worms, bugs, and creepy-crawlies.
Secret Weapon / Tool:
How they process matter:
Ex: Earthworms, Beetles
Part 3: Closing the Case (The Matter Cycle)
Use labels and sketches to map the flow of energy and matter in a self-sustaining ecosystem loop. Show how Producers, Consumers, and Decomposers work together.
Sketch Your Matter Cycle Diagram:
Sun & Plant (Producer)
➔
Animal (Consumer)
➔
FBI (Decomposer)
Be sure to draw arrows showing the path of nutrients!
Mystery Link:
How do plants use the nutrients that decomposers return to the soil?
Evidence Log Checked:
FBI Suspects Profiled
Matter Cycle Mapped
Grade 5 Science Unit: Life Systems Page 1 of 1
