Biology

Introduction to colonial algae with photomicrographs. The term colonial as used here applies to algae in which cells resembling free-swimming unicells form groups which may be large and elaborately interconnected as in Volvox, or smaller and relatively simple as in Synura.

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Hi Sahabaz, some popular options after biology are:
MBBS
BHMS
BAMS
BDS
B.Pharma
B.Sc biology
B.Sc Nursing
You may check more career options by choosing the relevant options here:
https://www.shiksha.com/careers

Courses after 12th Science with PCB:
MBBS
BAMS (Ayurvedic)
BHMS (Homoeopathy)
BUMS (Unani)
BDS
Bachelor of Veterinary Science & Animal Husbandry (B.VSc AH)
Bachelor of Naturopathy & Yogic Science (BNYS)
Bachelor of Physiotherapy
Integrated M.Sc
B.Sc. Nursing
B.Sc. Dairy Technology
B.Sc. Home Science
Bachelor of Pharmacy
Biotechnology

Hi,
It is not that only you have this doubt but many of them who take biology group have this doubt.
If you don't want to become a doctor, then you can pursue biotechnology, genetic engineering, etc. in engineering stream then, B.Pharma, B.Sc dairy technology, medical lab technology, life sciences, etc. are also the options.
If you don't want these also then it is better to study B.Sc in biology then M.Sc also so that you can become a professor in a good institution.