wastewater with a nitrogen/phosphorus ratio of 8 by atoms is being discharged in

Question

wastewater with a nitrogen/phosphorus ratio of 8 by atoms is being discharged into a lake. the N/P ratio of the algae in the lake is 16 by atoms. assume that the wastewater is the only significant source of nitrogen and phosphorus for the lake and that either N or P limits algal biomass in the lake. what happens to the algal biomass in the lake if:

* The N in the wastewater is reduced by a factor of 10? and is increased by a factor of 10?

* The P in the wastewater is reduced by a factor of 10? and increased by a factor of 10?.

the answer are:
no change
by a factor of 2
by a factor of 5
by a factor of 10

need an explanation of how you get the answer

Explanation / Answer

Biomass growth by a factor of 2

The np ratio increase in waste water increase the biomass but np ratio decrease will not decrease the biomass.

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