In Engelmann's experiment, the "independent variable" is the wavelength (color) of light shown on the alga. This is the factor that was deliberately changed to observe its effect on the outcome of the experiment, which is the amount of oxygen produced through photosynthesis.
In 1883, a researcher, named Theodor Engelmann, designed and completed an experiment to see which colors of light resulted in the highest production of oxygen from alga which indicates the highest rate of redox reactions during photosynthesis. Study the graphics seen here and answer the following questions about the experimental design and the findings. Question 1. In Engelmann's experiment, what factor could be considered the "independent variable"? (1 point) Responses Amount of oxygen produced through photosynthesis Amount of oxygen produced through photosynthesis The type of alga used throughout the experiment The type of alga used throughout the experiment Wavelength (color) of light shown on the alga Wavelength (color) of light shown on the alga The amount of aerobic bacteria that collected along the alga
1 answer