CAIE IGCSE Biology 19.2.19 Energy-efficient Human Food Chains
Practise explaining why eating crop plants transfers more energy to humans than eating livestock fed on those crops.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- compare the number of trophic transfers when humans eat crops or crop-fed livestock
- explain that each livestock transfer loses energy through respiration, movement, heat and waste
- apply lower-trophic-level reasoning to alternatives such as krill rather than seals
19.2.19—It is more energy efficient for humans question 1
[Maximum number: 4]
Animals such as salmon can be farmed for meat.
Explain why it is more energy efficient for humans to eat crop plants than to eat livestock that have been fed on crop plants.
any four from:
as fewer trophic levels / plants are at a lower trophic level (than salmon / livestock) ; ora
idea that energy transfer along food chain is inefficient ; (energy lost in) respiration / heat / (named) metabolic process / movement / muscle contraction ; ref to (more) material that is lost as, faeces / egested / inedible / not digestible (in longer food chains) ; (energy lost in) excretion / urine ;
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