For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. A powerpoint can be downloaded from the same site here. The s-cool revision site lets you revise the topic, summarizes the topic & tests you on it. Skoool gives you a lesson, including progress questions, for each Biology topic but you’ll need sound on for it. And both these sites – GCSE Bitesize & GCSE Bitesize – have revision pages (that take you through the topic), a test and an activity.
Topic 19 revision notes in downloadable word format; to be completed.
GCSE Bitesize covers Living Things in their Environment in 16m 44s.
This powerpoint covers a lot of Topic 19, as well as some of Topic 21:
How wolves change rivers (a nice intro to Ecology):
19.1 Energy Flow and..
19.2 Food chains, food webs & trophic levels
What is an ecosystem? video from The Virtual School:
What is a trophic level? video from The Virtual School:
Mr W sings Food Chains.
Science Bank 10 (Energy Cycles in Nature): Part 1 – Energy transfer in nature – food chains & energy flow through them (to 5m 25s); Part 2 – the Carbon cycle (to 10m 55s):
19.3 Nutrient Cycles
A short (2m 26s) vid from Clipbank – Recycling Nutrients & Dr Yan’s Rotting Food time lapse from Bang Goes the Theory (1m14s). What happens to your body after you die? – Instant Egghead video (2m 10s).
A lesson on the Carbon Cycle from Mr Dare: