Yes, because a conceptual framework represents the researcher’s synthesis of the literature on how to explain a phenomenon. It maps out the actions required in the course of the study, given his previous knowledge of other researchers’ point of view and his observations on the subject of research.

Not really, conceptual frameworks are based on researchers choice and if its part of your research aims and objectives. If its not, then you dont need to. However, its not difficult to do in any event. Its actually exciting and yes can be applied to descriptive studies.

Yes, you need it. Read Linda Dale Bloomberg & Marie F. Volpe (2008). Completing Your Qualitative Dissertation: A Roadmap From Beginning to End.

What Sachin Suknunan said was right. It depends on your research and your choice.

The conceptual framework is to conceive and concretize your research ideas, theorize the analysis of the problem, and form a certain shape and structure of your research.

Descriptive research is a common project research, which refers to the investigation and research of different factors and different aspects of the current situation. The collection and recording of data and data focuses on the static description of objective facts.

In your study, if you need conceptual framework, you can employ it. On the other hand, if you think it is unnecessary to your study conducting, you just leave it.

Hope this can help. Thanks.