The marking method of IGNOU is a serious one. You cannot just simply write anything and assume they don’t check the papers properly. The invigilators check the papers thoroughly and you cannot mislead them.
You will score good marks only if your answers are good. They should be directly linked to the question. If the examiner finds unrelated answers, this may backfire on you. So it’s easy for those who write exact answers and difficult for those who just write anything to get marks.