Interpreting data on limiting factors (graph on effect o light intensity on plant growth, effect of 2 types of heater)

- At the start of the graph, the greater the light intensity the greater the plant growth - At 200 ... of light the bottom graph flattens out, showing that CO2 conc. or temp, is a limiting factor - At 250 ... of light the top flattens out - The difference between the 2 graphs could be because the wood fires increases the temp. more than the electric heater - Or because increasing the conc. of CO2 in the air