Question

Why doesn't food enter the trachea instead the oesophagus?

Answer 1

There is a flap named epiglottis which blocks the or closes the opening of trachea and thus the food enters into oesophagus.
It is because if the food enters the trachea the windpipe may get blocked and the person may die

Answer 2

The food does not enter the trachea instead the oesophagus because of the epiglottis.