Another independent variable one could test for in a pollen tube growth is the different seeds from different plants.
Independent variable is the variable that is changed or manipulated in a series of experiments.
The independent variable is the variable that affects the dependent variable, which is the variable that is measured in the experiment.
The pollen tube is the tube that develops from the wall of a pollen grain and, in seed plants, provides a passage through which the male nuclei reach the embryo sac to effect fertilization.
In a pollen tube growth experiment, the pollen tube growth length will differ in different species of plants, hence, the different seeds used can be another independent variable to test.
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