Come up with an experiment with which a scientist, who has access to any devices and reagents, can prove that mushrooms

Come up with an experiment with which a scientist, who has access to any devices and reagents, can prove that mushrooms secrete substances that can digest other substances.

Mushrooms secrete enzymes that alter proteins, fats, and carbohydrates.
Experience 1. Mushrooms digest sugars. Take a vessel with sugar solution and put yeast there, stir. After a couple of days, conduct a qualitative reaction for sucrose with a sample from the solution: add a solution of copper hydroxide, if there is sucrose in the solution, it will turn bright blue, and if not, then there is no sucrose in the solution.

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