Question

what are the factors responsible for the development of cyclone

Answer 1

There are two primary influences on TC formation: internal and environmental influences. The consensus is that these two influences are equal in importance during the formative stage of a tropical disturbance. There is a requirement for some type of mechanism which will enhance the low-level convergence and increase the organization associated with a developing tropical disturbance or convective cloud cluster. This enhancement is usually attributed to an external influence, but as the disturbance becomes more organized and self-sufficient, the importance of the environment in maintaining the disturbance's structure lessens, but still has a large influence.

Answer 2

the centre of a cyclone is known as the eye of the storm which is a calm area.

and for further details please refer to NCERT class 7 chapter-winds storm and cyclone