from http://www.m-w.com/dictionary/culture

the set of shared attitudes, values, goals, and practices that characterizes an institution or organization.

Now you need to figure out, subjectively, what is “healthy” relative to an organization’s culture.

This sounds like a good comparison/contrast exercise.

Take some organizations you admire, and some you dislike strongly. Now compare and contrast their leaders and the organizational culture…and see what the role of the leaders were in both types of organizations to the way the organizations work, and how the general public and the employees perceive those organizations.

I hope this helps…good luck in your studies.