An agronomist wants to assess the number of root nodules per soybean plant and measure how the plant yield is effected based on the number of nodules. The agronomist plants 4 separate plots of soybeans and adds varying amounts of Rhizobium bacteria. After one growing season, the agronomist measures the soybean yield in each plot.

What is the dependent variable in the experiment?

A) the type of plant used in the experiment
B) the number of plots
C) soybean yield
D) number of nodules per plant


In the lab, you were to count the number of nodules found on the radish plant. What is the approximate number of nodules you counted on the radish?
A) 25
B) 75
C) 2
D) 0