You are growing plants hydroponically (rooted in an aqueous solution rather than soil). For one group of plants, the solution for the "control group" contains normal levels of salts and nutrients, while the solution for the "treatment group" has a high concentration of large molecular weight solutes that are excluded by roots. You find that the plants in the treatment group are on average smaller than those in the control group, but there is no significant difference between the groups in the amount of CO2 being fixed by the average plant. What differences at the cellular level between groups would you expect to make an important contribution to the difference in size of the shoots?
A)the total number of cells in the treatment group shoots would be smaller B)the girth of cells in the elongation and mature zones would be larger in the control group C)the length of cells in the elongation and mature zones would be larger in the control group D)cellulose molecules would be more randomly oriented in mature cell walls in the treatment group E)auxin levels and cell wall extensibility would be lower in the treatment group