Toxins Building Up in Food Chains
Explain how organisms affect and are affected by their environment, including the bioaccumulation of toxic materials (e.g. pesticides, heavy metals) through food chains
Share and support
Teaching Table
Set out your lesson
Practise the bounded task in Toxins Building Up in Food Chains; see exact limits before inferring broader coverage.
Can distinguish concentration from total amount; no handling pollutants or advice about eating fish.
Exact directed source edges retained; earlier authorship is not learner attainment.
These supplied stage cards
Scrap paper and pencil; oral/pointing response where appropriate
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.
Use the supplied screen cards; copying the exact task to paper is optional, not required.
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 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.
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.
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
No reviewed resources for this concept yet.
The teaching approach above still stands. Curated practice links will appear here as the shelf fills.
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