What happens if you put an earthworm on a bulb?

Onions have a variety of chemicals in their composition. They act as irritants for many organisms. In humans, onions cause tears due to specific substances that are secreted from the bulb. The worm has a nervous system. In each segment of the earthworm there is a nerve knot. Therefore, if you put a worm on an onion, it will begin to curl up and try to avoid danger. There is no need to do this, since it is inhumane, and nothing new can be learned from this experiment. All the results of such experiments are well described with explanations.