I know that a question can directly be related to a verb. However, can it refer to a noun rather than the verb?
On what subject did you conduct studies?
I think that this question can be evaluated in two ways that have the same meaning, indeed. Despite that, I'm curious about grammar.
How we can evaluate the question is firstly
I conducted [studies on the biography of Da Vinci.] = I conducted studies that are on the biography of Da Vinci.
On the biography of Da Vinci, I conducted studies. = I conducted [studies] [on the biography of Da Vinci].
I surely know that what I'm focusing on is totally unnecessary and weird. Nevertheless, as you can see in my sentences, the first answer to the question refers directly to "studies" while assuming "on what subject" to modify "studies", and the second answer to it refers to "conduct" rather than "studies" while assuming "on what subject" to be an adverb.
So, can this and these kinds of question be really evaluated and understood like this?