What a strange question.
Have you looked in the manual?
A printer will work in black and/or colour as per instructions sent to it from your system - you can't pick and choose all black (including what would be colour areas) as far as I'm aware.
Even if you took the colour cartridges out (at least in the case of the Canon I use to own) it would only print the black areas or text and leave spaces where colours should be.
If you just want to print in all black than a mono laser is the best bet.