In one of the section of personal history, there is column to mention all the organization i was associated.
Top of head, i recall below organization. let me know which one should i write.
TOASTMASTERS
UNIVERSITY ALUMNI 
COLLEGE ALUMNI
PROFESSIONAL ENGINEERING LICENSE (I just registered, don't have license, but do have a registration #)
You could certainly leave out most of these entities. CIC is probably more interested in knowing about military/paramilitary/suspected terrorist organizations and the like rather than your college groups. 
Another question. In the travel history section, should i write the trips i made to India (home country) while my stay in Canada?
E.g
COUNTRY: India    START: May, 2009   END: Jun, 2009  PURPOSE: Visit family
COUNTRY: India    START: Jan, 2011   END: Feb, 2011  PURPOSE: Visit family
OR
mention all the ins and outs (per passport stamp) for the countries, I've been.
E.g
COUNTRY: Canada  START: Jan, 2008   END: Apr, 2009  PURPOSE: Study
COUNTRY: India    START: May, 2009   END: Jun, 2009  PURPOSE: Visit family
COUNTRY: Canada  START: July, 2009   END: Dec, 2010 PURPOSE: Work
COUNTRY: India    START: Jan, 2011   END: Feb, 2011  PURPOSE: Visit family
COUNTRY: Canada START: Jan, 2011   END: Present  PURPOSE:Work
So on and so forth (just like showing all the entry/ exit stamp in chronological order)
Fairly certain that you can leave out any trips made between Canada and your country of citizenship. 
As always 
Thank you
Andy