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ScienceEcosystems & HabitatsAges 11–12

Food Webs & Interdependence

Construct and interpret food webs showing the interdependence of organisms in an ecosystem, explaining how a change in one population affects others

Lesson

Set out your lesson

Practise the bounded task in Food Webs & Interdependence; see exact limits before inferring broader coverage.

Before teaching

Use this short check, then start teaching.

Activity

Understand eats/is eaten by and count linked relationships.

Policy

Exact directed source edges retained; earlier authorship is not learner attainment.

Printer, credit, and teaching notes

Exact directed source edges retained; earlier authorship is not learner attainment.

Materials

  • These supplied stage cards

  • Scrap paper and pencil; oral/pointing response where appropriate

Sequence

  • Read readiness and decide on support without treating prerequisite authoring as learner readiness.

  • Open Show first and explain its model.

  • Use Guided Try with support and its separate adult key.

  • Close Show and guided keys before Try, unless this Try is explicitly supported.

  • Reflect on an actual attempt, including help used.

No Printer

Use the supplied screen cards; copying the exact task to paper is optional, not required.

Privacy

Use only invented scenarios and optional anonymous local notes. Do not request names, photos, family finances, medical data, accounts or uploads. Stop uncomfortable physical activity.

Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view.

Next: Show

Adult extras
Teaching limits and safe use

These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.

  • A stipulated simplified web, not field population data or a deterministic prediction.

Use only invented scenarios and optional anonymous local notes. Do not request names, photos, family finances, medical data, accounts or uploads. Stop uncomfortable physical activity.

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Teaching approaches

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1 approach

Selected Default Gakuva

Practise the bounded task in Food Webs & Interdependence; see exact limits before inferring broader coverage.

Practise the bounded task in Food Webs & Interdependence; see exact limits before inferring broader coverage.

Family records and proof options

Keep a record of your learning

Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.

View learner plans ($12/mo per learner) See sample family archive

Learning resources

Extra practice links — they do not replace Gakuva’s teaching approach.

PhET Interactive Simulations · Practice link — not the full lesson

Natural Selection

Open practice (new tab)
Before you open · source notes

Natural Selection supports hands-on exploration for Food Webs & Interdependence. Not every lab worksheet.

Free interactive page, no sign-in required for the tested path.

Before you open

Ask the learner what they changed in the sim or page and what they observed.

Opening this link does not save learning or assess mastery.

Source, access and review notes

Public PhET Interactive Simulations page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.

PhET Interactive Simulations. “Natural Selection.” External page; Gakuva does not copy, host, embed, or redistribute materials.

Unknown — link only

Check understanding

  • Draws a food web from given data with arrows showing energy flow direction
  • Predicts how the population of one species would change if another species increased or decreased
  • Distinguishes a food web from a food chain and explains why webs are more realistic
  • Identifies producers, primary consumers, secondary consumers, and apex predators
“If your child was shown a diagram with lots of animals connected by arrows, could they explain what it means — tracing what eats what — and predict what would happen if one animal disappeared from the web?”

Curriculum record

Type
Conceptual
Subject
Science
Domain
Ecosystems & Habitats
Age range
Ages 11–12

Standards

ngss-ms:MS-LS2-1the-ontario-curriculum-science-and-technology-20:ON-SCI-2022-G6-B2.5uk-nc-2013:KS3.Sci.Bio.Ecosystem.1