Hello Candidate,  Basic eligibility criteria for BSC nautical science is as follows 

Students have to complete their 12 th with Physics chemistry and mathematics as a compulsory subjects. Students have to clear 12 th with minimum 60 percent marks.  

So as per the eligibility criteria you are not eligible to apply for BSC nutical science. 

I hope it will help you more. 

Thanks. 

Hello,
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Yes,You can ofcourse do BSC with biology stream.
As you Even know BSC is mostly related to Bio,, science, mathematics.. there's no objection for you in taking BSC nautical science.
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For leading a best career, you can do M.S.C/MBA/M.TECH after your graduation gets completed.
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These are the course suggested for you to Start up a good career.
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Best of luck
Thank you