Motivation in Research

What makes people to understand & undertake the research? This is a question of fundamental importance.The possible motives for doing research may be either one or more of the following:--

1. Desire to get a research degree along with its consequential benefits.
2. Desire to face the challenge in solving the unsolved problems.
3. Desire to get a intellectual joy of doing some creative work.
4. Desire to be of service to society.
5. Desire to get respectability.