Ah... this looks like a BTEC business assignment question... googled it, found very few articles... so the alternative here is to think about it logicly and make things up, right?
So Ethical Practice means:
Have a look at this
Ethics
Ethical Practice effect on organizational performance:
think of the advancement of the company, promotions of employees, trust of the community, carrying out on-the-job posts, level of co-operation amongst employees, legal effects and minimizing law suits filed against organizations...etc...