Important part of writing IGNOU BCA assignments or term end exam is visibility of question number for which you are writing.
Please do write roll number on every page as shown in the below sample. In some cases it saved students from misplaced assignments from study center side.
Can I write multiple answers in same page in IGNOU assignments ?
Yes, you can write multiple answers in same page BUT please see following screen shot. MUST leave 6 CM gap between two questions.