Problem
Based on the data in the scatter plot, estimate the percentage change in dry mass of corn and velvetleaf plants if atmospheric CO2, concentration increases from 390 ppm (current levels) to 800 ppm (1) What is the estimated dry mass of corn and velvetleaf plants at 390 ppm? 800 ppm? (2) To calculate the percentage change in mass for each plant, subtract the mass at 390 ppm from the mass at 800 ppm, (change in mass) divide by the mass at 390 ppm, (initial mass) and multiply by 100. What is the estimated percentage change in dry mass for corn? For velvetleaf? (3) Do these results support the conclusion from other experiments that C3 plants grow better than C4 plants under increased CO2, concentration? Why or why not?