From which stream should I pursue B.Sc for good job opportunities in future: ZBC or ZBG? In which field can I get a job after them?

I think you should take ZBC for sure. It's because you can pursue Master in the same field and thereafter you should give a try to UGC NET for the Ph.D. if you don't want to go into teaching line you can pursue MBA, MCA, MBA for marketing and sales. After MCA, you will secure your job in IT sector.