Ph.D

I am sorry to say, but with this mark you won't be able to get good colleges.
Apply in private universities, although they also set some criteria for admission.
All the best.

Yes, there are many university which providing Master and PhD level program in distance or part-time mode. You may visit the website of Indra Gandhi Open University for eligibility criteria in your field of studies.

MCA graduates from recognised universities are eligible for higher studies such as M.Tech/ MS or PhF in India and abroad.

In case, you wish to pursue PhD in India here is a list of some top notch research institutes:
• National Center for Biological Sciences (NCBS), Bangalore
• Tata Institute of Fundamental Research (TIFR), Mumbai
• International Center for Genetic Engineering and Biotechnology, New Delhi (Home - ICGEB)
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You need to have Master's degree for doing Ph.D. It means you must have MDS./MA/M.Sc/M.Com, etc. for Ph.D.

Yes, you can pursue but you have to complete your masters first then you are eligible for Ph.D.