BA in Business but Interested in I/O Psychology?

[Classy girl]

I have a Bachelor in Business, and 8 years experience working in management consulting. I have a strong passion for psychology, and found that I/O Psychology would be a good fit for me. I am consideringf pursuing a Master's degree in it. I have the following questions:

1. Will I have to take undergrad courses before I can pursue a masters degree in I/O Psychology?

2. What schools offer a masters degree in I/O Psychology in Canada ( Ontario or Quebec preferably) that you would recommend?

3. Do you think that obtaining an MBA in Organizational Behaviour is a better option? Do you think these two degrees are similar?

4. What do you think of this move?

Thanks in advance..