Research questions not only are important, they are fundamental for scientific research. The main reason is that a research question provides (or at least should provide) a viable way to investigate a complex scientific problem. For example, the problem of understanding the human mind has so many aspects and is so complex that you cannot hope to solve it without transforming it in so many research questions of much less scope than the original problem.
A good research question is open and exploratory. It is manageable within the scope of the topic, degree, time, assessment and student. The question is free of ambiguity. It is clear, simple and interesting to others. The question relates to the subject matter... pre-reading and a review of the literature is required to formulate a good research question.
All of these give you a clear space and base to support a reason.
