NUTRIENT CYCLES - AQA A LEVEL BIOLOGY + EXAM QUESTIONS RUN THROUGH 

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1 year air time is crazy gang

Hi! The fact that different crops use different nutrients means that they're less likely to compete for the nutrients, so more crops will survive and reproduce. The fact that crops containing nitrogen-fixing bacteria means an increased yield as the ammonium produced by nitrogen fixation can be converted into nitrates, which can be used to build DNA, therefore leading to a higher crop growth and yield. I didn't mention this in the video as the question only says "suggest" and not "explain". I hope that this helps! :)

Hi! As you can see by the diagram, process Q is showing nitrogen fixation, as nitrogen gas is being converted to ammonium ions. The question says "describe ANOTHER process", so you can't put nitrogen fixation in your answer as it is already in the diagram. Hope this helps :)

@@AlevelBiologyHelp Thank you so much!

Hi! It's to do with the fact that different crops have different pathogens attacking them. This means that depending on the pathogen, different minerals/ions are released into the soil upon decomposition (as you've said) , allowing a wider variety of crop species to grow. :)

Hi! It's just PCR as normal, but you start with RNA instead of DNA, so you need reverse transcriptase to convert the RNA into DNA ready for amplification.