Lesson Q2 L1 – What Is an Environmental System?

Lesson Overview

Quarter 2 · Unit 1: Environmental Systems & Interactions · Week 1 · Grades 3–5 · Lesson length: 45–60 minutes (5E model with Kagan cooperative learning structures)

Essential Question: What is a system, and how do its parts, inputs, and outputs work together?

Lesson Objective: Students define systems, identify system components, and create simple input/output maps of environmental systems.

Tool Focus: Models and diagrams as scientific tools — students use a system diagram to show parts, interactions, inputs, and outputs.

Why It Matters: This lesson builds the foundational systems thinking students will use throughout the entire quarter and all of Unit 1.

Teacher Note: This is your anchor lesson. The vocabulary, thinking routines, and diagram skills introduced today will be referenced in every subsequent lesson this unit. Take time to build the concepts carefully.

Standards & Learning Targets

NGSS codes 3-LS4-4, 5-ESS2-1, and 5-LS2-1 under this heading.

NGSS Systems Thinking: Crosscutting Concept: Systems & System Models; Science & Engineering Practice: Modeling.

ISTE: 1.5 Computational Thinker (5c: break problems into component parts — parts, inputs, outputs of a system); 1.6 Creative Communicator (6c: communicate complex ideas using models).

Learning Targets — students will be able to: Define a System: Explain that a system is a group of connected parts that work together toward a function. • Identify Parts: Name living (biotic) and nonliving (abiotic) components within a given environmental system. • Explain Inputs/Outputs: Distinguish between what enters a system (inputs) and what it produces (outputs). • Create a System Diagram: Draw and label a simple diagram showing parts, inputs, outputs, and interactions with arrows.

Key Vocabulary: System · biotic · abiotic · input · output

Materials & Teacher Prep

Preparation time is approximately 15–20 minutes. Display ecosystem photos before students arrive.

Materials Needed

• Chart Paper & Markers: For anchor charts on system definitions, inputs, and outputs. Use large print visible from the back of the room.
• Printed Ecosystem Photos: Pond, forest, garden bed, schoolyard, fish tank — one set per table group.
• System Diagram Handouts: Pre-printed template with labeled sections for parts, inputs, outputs, and arrows.
• Sticky Notes: For brainstorming system parts during Explore. One color per category (biotic/abiotic).
• Optional: Mini Terrarium or Plant: A live or model ecosystem as a concrete anchor for discussion. Highly recommended for Grades 3–4.
• Student Worksheet 2.1 (Student Worksheets file)

Teacher Prep Checklist

• Display Visuals: Post ecosystem photos at the front and at table stations before students enter.
• Prepare Partnerships: Arrange intentional A/B partner groupings for Timed Pair Share. Mix readiness levels.
• Choose Local Examples: Select 1–2 systems from your school context: garden, playground, desert habitat, cafeteria, etc.
• Pre-load Vocabulary: Write system, biotic, abiotic, input, output on the word wall before class begins.

Safety: Outdoors: water, hats and sunscreen per school policy; stay within the agreed boundary where the adult can see you. Sources: CDC, Heat and Your Health; CDC, Sun Safety. See the Safety & Fact-Check Log.

Lesson Flow & Timing

Total lesson time: 45–60 minutes. The Explore phase is your largest investment — protect this time for student thinking and dialogue. An optional Extend activity (design a new system or research a local ecosystem) can be assigned as homework or enrichment for early finishers.

Pacing Tip: If running short on time, shorten the Elaborate prompt to a quick partner share rather than a full written response. Never cut the Evaluate — it’s your formative data. Flex points: Engage can extend to 15 min if student observations are rich; Explore is the core phase — protect 20 full minutes; Extend is optional homework or a next-day warm-up.

Phase 1 · Engage — The Hook

Teacher Talk: Look Around You — What Do You Notice? Display photos of a pond, fish tank, schoolyard, garden bed, and forest. Give students 60 seconds of quiet observation before discussion begins. Preview the vocabulary for this activity: system. The formal definition comes in Explain.

Ask Students: “What do you notice in this image? What do you see, hear, or imagine?” • “What parts can you identify? Are there living things? Nonliving things?” • “What might these different places have in common?”

PCM Differentiation: Thinker Base: Ask pattern-level questions: “What patterns do you notice across all the images? What rule might connect them?”

Harmonizer Base: Ask connection/care questions: “Which place feels important to you? Who or what depends on it?”

Teacher Talk: Your goal here is curiosity, not correct answers. Celebrate all observations. Write key words students say on the board — you’ll return to them when defining a “system.”

Phase 2 · Explore — Kagan Cooperative Activity

Kagan Structure: Timed Pair Share: Students work with their assigned A/B partners to practice systems thinking through structured dialogue, then apply their thinking to a diagram. This Kagan structure ensures all voices are heard. Say input and output aloud and post them where every team can see them; you will return to them in Explain.

Step-by-Step: Step 1 — Partner A Explains (90 sec): Partner A describes a system from the photos: “This is a ___. The parts are ___. It needs ___ to work.”

• Step 2 — Partner B Identifies (90 sec): Partner B listens, then names inputs and outputs: “One input I hear is ___. An output would be ___.”

• Step 3 — Switch Roles (90 sec each): Partners reverse. Partner B explains a different system; Partner A identifies inputs/outputs.

• Step 4 — Begin System Diagram: Students independently begin their system diagram handout using the vocabulary practiced in the partner share.

Teacher Moves During Explore: Circulate Purposefully: Move table to table. Listen for vocabulary use. Note pairs who need redirection for whole-class debrief. • Prompt Academic Vocabulary: “Use the word input in your sentence.” Redirect informal language toward disciplinary terms. • Encourage All Voices: If one partner dominates, gently say: “Let’s hear Partner B’s idea first this round.” • Support Quieter Learners: Pre-teach 1–2 sentence starters to shy learners before the activity begins: “I notice… / One part is…”

Phase 3 · Explain — Direct Instruction

What Is a System?: Core Definition: “A system is a group of connected parts that work together to function as a whole. If one part changes, the whole system is affected.”

Introduce the definition using the anchor chart. Then model with three concrete examples students already know, moving from simple to complex:

A Bicycle: Parts: wheels, chain, pedals, frame. Each part has a role. Remove the chain — the whole system stops working.

A School Garden: Parts: soil, seeds, water, sun, insects, gardeners. All parts interact. Remove the pollinators — fewer plants grow.

A Pond: Parts: water, algae, fish, insects, sunlight, rocks. Each living and nonliving part supports the others in a web of dependence.

Check for Understanding — Ask Students: “What happens if one part of the bike is missing?” • “Can a system change over time? What might cause it to change?” • “Is our classroom a system? What are its parts?”

Teacher Talk: Write the definition on the anchor chart and leave it visible all lesson. Underline the words connected and together — these are the conceptual heart of systems thinking. Return to this chart during the Evaluate phase.

Environmental Systems: Inputs & Outputs: After establishing what a system is, zoom into environmental systems specifically. Teach the biotic/abiotic distinction, then model how matter and energy move through a system using inputs and outputs.

Biotic (Living): Plants, animals, fungi, bacteria, insects. Any living or once-living component of the system.

Abiotic (Nonliving): Water, sunlight, air, soil, rocks, temperature. Physical and chemical components that shape the environment.

Inputs: Water · Sunlight · Nutrients · Air · Seeds · Energy

System Processing: Plants grow · Animals feed · Nutrients cycle · Energy transfers

Outputs: Oxygen · Food · Seeds · Waste · New organisms · Heat

Garden Example: Use a school garden as your model. Walk through each component together as a class before students try independently.

Teacher Talk: Draw the garden on the board. Start with the sun at the top and arrow inputs downward into the system box. Then arrow outputs outward. Students follow the same structure on their diagram handout.

Quick Checks — Ask Students: “Name one living part of a garden ecosystem.”

“Name one nonliving part that the living things depend on.”

“What is one input this system needs to keep working?”

“What does the system produce — what comes out?”

Phase 4 · Elaborate — Student Product & Differentiation

Student Product: System Diagram: Students select one environmental system and create a labeled diagram showing its parts, inputs, outputs, and interactions. This is your primary formative assessment artifact.

System Choices: Garden (most accessible — especially strong if your school has a garden or garden photos); Pond or Lake (great for biotic/abiotic contrast); Fish Tank / Terrarium (ideal if you have a classroom model — students can observe directly); Schoolyard Habitat (highly relevant and immediately observable).

Diagram Must Include: System name and label

At least 3 parts (mix of biotic + abiotic)

2 or more inputs labeled with arrows entering the system

2 or more outputs labeled with arrows leaving the system

Arrows showing interactions between internal parts

Differentiation by Grade Band: Grades 3–4: Labels + drawings are sufficient. Sentence starters provided. Teacher scribing allowed.

Grade 5: Add a written explanation (2–3 sentences) describing how parts depend on each other and what would happen if one input were removed.

Collect diagrams at the end of class as your formative check. Look for accurate use of arrows and input/output labels.

Phase 5 · Evaluate — Closure, Exit Ticket & Assessment

Exit Ticket: Students respond on an index card or sticky note before leaving:

1. What is a system? Students write their own definition, using the anchor chart as a reference if needed.

1. Why do parts depend on each other? Students explain interdependence: “If ___ were removed, then ___ would happen because ___.”

1. Name one input and one output. Students identify from their own diagram, using proper vocabulary terms.

Answer Key / Look-Fors: (1) A group of parts that work together and depend on each other. (2) A complete if/then/because statement (e.g., “If the bees were removed, then fewer plants would make seeds because flowers would not be pollinated”). (3) Correct input (sunlight, water) and output (oxygen, fruit, waste) from their diagram.

Expanding Circles — how does this connect to… Ask: “How does your system connect to you → your classroom → your school → your community → the world?” Students can share with a partner before or after writing.

Formative Assessment (group students using each student’s System Diagram and the exit-ticket definitions of a system, its inputs, and its outputs): Meets (3): Diagram shows at least four parts, one input, one output, and two interaction arrows with vocabulary.

Approaching (2): Diagram shows parts but inputs/outputs or interactions are missing.

Not Yet (1): Diagram is a list of objects with no connections — reteach with the garden anchor chart and one modeled arrow.

Extend & Looking Ahead

For review, the 1-minute video for each grade revisits today’s big idea: Grade 3; Grade 4; Grade 5.

Optional Extend: design a new system or research a local ecosystem (homework, enrichment, or next-day warm-up).

Quarter 1 connection: Lesson 1.2 (Our School/Classroom Garden) first introduced the garden as an interconnected system.