Thanks for your response. So I don't have to carry Cancelled Indian passport & Canadian Citizenship Certificate..thanks for confirming that.....But, you didn't talk about Surrender Certificate. What about that? I assume I don't have to carry that either. right?
By the way, I don't think Cancelled Indian passport is like old 500 rupee note. Because you can just throw/tear old 500 rupee note, but I don't think you can do that with cancelled Indian passport. I am told that if you ever have to deal with CGI/BLS again in future (for eg., OCI application for any of your children who are not born yet OR, re-endorsement of your renewed Canadian passport number on OCI which you'll do every 10years(5years in case of minors) OR Re-issue of OCI in case of stolen/lost/damaged OCI), my friend you'll need to re-submit your 'useless' Cancelled Indian Passport again. So please don't throw/tear it like Old 500 rupee note, if you haven't done that already.
And, no I don't plan to indulge in Journalism, Research & Tablighi Jamaat activities, but thanks for the info.