Science

Hello Shabana,
It's nice to your interest in these offbeat branches. To advise you frankly, job opportunities in all these branches is rather limited. But if you are interested the do go ahead. All three are at same level.
Best wishes.

B.Sc in computer related application can help you to crack CSE.

Indian IT industry primary business is Applications Development and Maintenance and more then 50% revenue is generated from ADM business. MCA graduates are more suitable for ADAM therefore majority of companies prefer MCA graduates. M.Sc CS graduates are preferred by hardcore technology companies whose primary business is systems development & integration and embedded systems development.

There are many colleges offering Bachelor programs in biotechnology. Since, the course demands diverse skill sets, a strong disciplinary training in various basic sciences will add more value in the long run than a B.Sc (Biotech) program. Unless of course, one opts for a five year integrated M.Sc/ M.Tech program offered by institutions like IITs.

Ideally, if you are interested in doing PhD, you must complete it along with your post graduation studies. Once you are in job motivation to do PhD will be difficult. However, Answer to your question can be better answered by any expert if you share your educational and professional career details.

Simply because we are trying to control it without having control over the internal one.

Part-time PhD is available in many universities but not by distance mode.

No, you need to do 12th if you want to go for B.Sc.

Zoology is a good branch and life science is average. Biotechnology can also be an option and pharmaceutical also has good scope.