Toxins Building Up in Food Chains

ScienceEcosystems & HabitatsAges 12–13

Explain how organisms affect and are affected by their environment, including the bioaccumulation of toxic materials (e.g. pesticides, heavy metals) through food chains

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Teaching Table

Set out your lesson

Practise the bounded task in Toxins Building Up in Food Chains; see exact limits before inferring broader coverage.

Activity

Can distinguish concentration from total amount; no handling pollutants or advice about eating fish.

Policy

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. Retain an earlier model only when the current step supplies it as context.

Teaching limits and safe use

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

Fictional data and qualified mechanism; named real methylmercury example needs further source/domain review. No exposure, health or food-consumption advice.

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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Entire curriculum

1590 concepts · 8 subjects

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Teaching approaches

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1 approach

Selected Default Gakuva

Practise the bounded task in Toxins Building Up in Food Chains; see exact limits before inferring broader coverage.

Family records and proof options

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Learning resources

External links for extra practice. They do not replace Gakuva’s teaching approach.

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Check understanding

Defines bioaccumulation and explains why toxins increase in concentration higher up the food chain
Gives a real example of bioaccumulation (e.g. DDT in peregrine falcons, mercury in tuna)
Explains how organisms can change their habitat (e.g. earthworms aerating soil, beavers creating wetlands)
Discusses why top predators are most at risk from bioaccumulation

“If your child heard that large fish like tuna can contain more mercury than small fish, could they explain why that is — even though the tuna didn’t encounter mercury directly?”

Curriculum record

Type: Conceptual
Subject: Science
Domain: Ecosystems & Habitats
Age range: Ages 12–13

Standards

ngss-ms:MS-LS2-4ngss-ms:MS-LS2-5uk-nc-2013:KS3.Sci.Bio.Ecosystem.3