ConceptConceptDocsDocuments

Edexcel IGCSE Biology 4.8 Food chains & energy transfer

Practise using food-chain data to calculate energy or biomass transfer and explain why transfer between levels is limited.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • calculate transfer efficiency or mean energy per organism from biomass and energy data
  • use graphs or tables to link biomass changes to light, nitrate concentration and feeding
  • explain losses from respiration, heat, faeces, uneaten material and indigestible plant parts

4.8 Food chains and energy transfer question 1

[Maximum number: 2]

The diagram shows part of a woodland food web.

Figure for Question 4.8 Food chains and energy transfer question 1 — Edexcel IGCSE Biology

This is one food chain from the food web.

 oak tree  ⟶  mouse  ⟶  fox \text { oak tree } \text { ⟶ } \text { mouse } \text { ⟶ } \text { fox }

Photosynthesis results in 25000 kJ of energy being transferred to the biomass of the oak trees each year.

Only 8\% of this energy is transferred to the biomass of the 20 mice each year.
Calculate the mean amount of energy transferred to the biomass of one mouse each year.
mean amount of energy = kJ

All question bank results loaded