Well, there was this one time where he got really sick, and that his skin started to show some itchy rash. His mother got alarmed by it, because on top of his high fever, skin irritation surfaced too. So yeah, maybe plants do show the same sign if it's sick? "Professor?" Hand up. "Could a plant be sick if it has spots on its foliage?" Not all mundane plants have spots, right? It should be some sort of irregularity, so it must be a sign.

Putting his hand down, he got his writing implements, and prepared to take some notes. Well, it looks like today's going to be a long one...