IGCSE biology notes on ecology should include food web rules, carbon/nitrogen cycle summaries, and population keywords (community, ecosystem, niche).

Hub: IGCSE biology notes · Organisms & environment · Nutrient cycles · Conservation.

Ecology note blocks

Block	Content
Terms	Producer, consumer, decomposer, trophic level
Pyramids	Biomass vs numbers — when each used
Cycles	Carbon: photosynthesis, respiration, combustion
Human impact	Deforestation, pollution, greenhouse effect bullets

Skills

Practice interpreting population graphs from past papers — add one example to notes.

Frequently asked questions

Food chain vs web?

Notes: web shows multiple feeding relationships.

Sampling methods?

Quadrat/transect summary if required for Paper 6 — practical tips.

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