Final answer:
The scientist responsible for establishing plant physiology is Mikhail Tsvet.
Step-by-step explanation:
The scientist responsible for establishing plant physiology is Mikhail Tsvet. He is known for his work in chromatography, a technique to separate and analyze different components of mixtures. In 1903, Tsvet developed the technique of chromatography and used it to separate plant pigments, which allowed the study of plant physiology to advance.