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EnglandEnvironmental ScienceQuick questions
3.1 The living environment
Quick questions on Life processes in the biosphere: energy flow, trophic levels and productivity - AQA A-Level Environmental Science
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is q1?Show answer
Explain why food chains rarely have more than four or five trophic levels. [3 marks]
What is q2?Show answer
Define gross and net primary productivity and give the relationship between them. [3 marks]
What is q3?Show answer
Producers fix 30 000 kJ per square metre per year (GPP) and respire 11 000 kJ per square metre per year. Herbivores assimilate 1900 kJ per square metre per year. Calculate NPP and the transfer efficiency to herbivores.
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