1. The problem statement, all variables and given/known data http://www.xtremepapers.com/AQA/Human%20Biology/2004%20Jun/AQA-BYA5-W-QP-JUN04.pdf [Broken] Look at question 3(c) The mark scheme answer is: Phytoplankton reproduce at rate ≥ rate of their consumption 2. Relevant equations 3. The attempt at a solution How can this make sense. If the biomass of phytoplankton is LESS THAN THAT OF THE ZOOPLANKTON who feed of the PHYTOPLANKTON, surely the phytoplankton are reproducing slower than rate of consumption?