Edexcel IGCSE Biology 4.9 Abiotic & biotic factors
Practise explaining why energy transfer between trophic levels is low, using food-chain examples, tables and percentage data.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- explain low transfer using respiration, heat loss, movement, egestion, excretion and uneaten parts
- compare transfer or production efficiency values from a table and justify the difference
- link the 10% idea to smaller biomass and fewer organisms at higher trophic levels
4.9 Ten percent energy transfer question 1
The diagram shows part of a woodland food web.
This is one food chain from the food web.
Explain why only 8% of the energy stored in the biomass of the oak trees is used by the mice for growth.
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