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A level Biology: Post your doubts here!

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Herbivore is the primary productivity. Hence finding the proportion of net primary productivity. You have to do net primary/gross promary. Gross primary productivity is whatever amount of energy being supplied from the producer i.e 1.8 and net primary is whatever was actually absorbed after energy loss by respiration digestion etc i.e 0.75 hence the ans is 0.75/1.8 which is B
 
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