What's a Plant Physiologist?

Definition of a "plant fizz":

A plant physiologist studies the life processes in plants. Plants look like they basically just sit there in the soil. But they can be very busy with photosynthesis, taking in carbon dioxide and giving off oxygen, and responding to light, temperature, moisture, insect pests and chemicals—to name only a very few. A plant physiologist might specialize in one particular process or become an expert in one particular plant.

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Animated drawing of a bean vine that 'grows' from left to right