In an experiment the hypothesis is if the wavelength of the light shining on a plant is shortened the rae of the photosynthesis is slowed down, if the experiment is preformed the independent variable .. a) will be the wavelength of the light b) will be the plant on whcih the light is shining c) will be the rate of photosynthesis d) can not be determined

The independent variable in any experiment is what YOU change
and then you look to see the result of the change.

In this experiment, the independent variable is the wavelength of
the light. (A)  Nothing happens until the person doing the experiment
changes the wavelength of the light.  When he DOES that, he looks
to see whether it affected the health and behavior of the plants.

Ais the answer hope this

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.