IB Biology SL 4.2.12 Energy transfer efficiency Question Bank
Practise IB Biology SL 4.2.12 by calculating energy loss and comparing transfer efficiency in food chains.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain why little energy transfers between trophic levels.
- Calculate or compare energy-transfer efficiency and biomass production.
C4.2.12—Energy reductions question 1
[Maximum number: 3]
Food chains combine to form food webs in an ecosystem.
The efficiency of energy transfer along the various food chains in a food web varies. Suggest reasons for the differences.
a. energy is lost between trophic levels as heat/metabolism/10\% (or less) is transferred (accept converse);
b. length of food chains varies / number of trophic levels in the food chains vary;
c. some animals / herbivores may be able to digest (more) plant material/ cellulose/ parts of their food such as skin or bones than other animals;
d. some animals are different in size / are more active;
e. use more energy (to keep warm or cool) than others/are warm or cold blooded;
3
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