GCSE Ecology new spec for triple higher students: tropic levels and pyramids of biomass

2 worksheets in 2 levels of ability plus answer document on these topics. Suitable for many boards - AQA and Edexcel references included.
Students answer exam style questions on these topics and construct pyramids of biomass, the second one being more difficult than the first.
objectives: subject content, maths, exam technique
good for: homework; revision; cover; part of an independent project if lesson time is short
timing: about 40 minutes