It is not good. "Requirement for" leads the reader astray. I think you have to take pains to be clear: "He asked questions about fulfilling the scholarship requirement that he participate in the experiment."
I call it wrong. "Requirement for" goes in the wrong direction. Participation in the experiment is a requirement for a scholarship. "Requirement of" is closer to your meaning in your sentence, but that would have been clumsy and unclear. A use is wrong if it fails to convey the intended meaning.