The mass of some corn plants at the end of their growth period was 6 tons per acre. most of this mass was produced from?

The majority of mass of any plant is produced from water from the soil and carbon dioxide with sunlight from the air. 6 CO2 + 6 H2O + sunlight ---> C6H12O6 + 6 O2 ... The gluclose (C6H12O6) is a simple sugar that becomes the biomass of the plant. Other minor contributors to the mass are from fertilizers (mostly N, P, and K) and minerals.

Number 6. Response to stimuli. At least I think. Or 6, homeostasis.