Pollination is the transfer of pollen from the male parts of a flower to the female parts of a flower of the same species, which results in fertilization of plant ovaries and the production of seeds.
Choose your x and y carefully. Scientists like to say that the independent variable goes on the x-axis (the bottom, horizontal one) and the dependent variable goes of the y-axis (the left side, vertical one).
The difference is that the value of the independent variable is controlled by the experimenter, while the value of the dependent variable only changes in response to the independent variable. When results are plotted in graphs, the convention is to use the independent variable as the x-axis and the dependent variable as the y-axis.