Year 13 Biology
Energy transfer in ecosystems and nutrient cycles
Biomass and energy transfer between trophic levels, productivity and efficiency, the effects of farming practices, and the nitrogen and phosphorus cycles with the role of microorganisms and fertilisers.
Energy transfer in ecosystems and nutrient cycles free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. Cattle ingest 900 kJ and lose 300 kJ in faeces and urine. If movement is restricted so that respiratory losses fall to 250 kJ, what is their net production in kJ?
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