Hi,
I am the primary applicant for Canadian PR. I have a query.My wife's english is not too strong. Is she also required to take IELTS exam for PR.
No. If she does well on the IELTS, you can gain extra points, but if her English is poor, there's no need to bother.
If I get the PR, will she get a dependent PR ? Can she work on that PR visa?
Yes, and yes.