I couldn't crack neet twise time. Now what should I do? I want to do a plain bsc. And doing research. Which stream of biology i should take?

To begin with, here is an exhaustive list of all the options available to you:

MBBS – Bachelor of Medicine and Bachelor of Surgery

BHMS – Bachelor of Homeopathy Medicine and Surgery

BAMS – Bachelor of Ayurvedic Medicine and Surgery

BUMS – Bachelor of Unani Medicine and Surgery

BDS – Bachelor of Dental Surgery

B Sc AH (Animal Husbandry)  Bachelor of Veterinary Sciences

B Sc – Bachelor of Science

B Sc Microbiology – Bachelor of Science in Microbiology

B Sc Biotechnology – Bachelor of Science in Biotechnology

B Sc Bio Chemistry – Bachelor of Science in Bio Chemistry

B Sc – Nursing

B PT – Bachelor in Physio Therapy

B Pharm – Bachelor in Pharmacy

B Sc Agriculture – Bachelor of Science in Agriculture

B Sc Horticulture – Bachelor of Science in Horticulture

B Sc Environmental Science – Bachelor of Science in Environmental Science

B F Sc – Bachelor in Fisheries Sciences

B Sc MLT – Bachelor in Medical Technology

B Sc Occupational Therapists

B Sc Audiology

B Sc Speech and Language Pathology

B Sc Radiography

B Sc Rehabilitation Therapy

B Sc Food Technology

B Sc Nutrition and Dietetics

B Sc Botany

B Sc Zoology

B Sc Anthropology

B Sc Home Science

If you do BSc, you'll also have to do MSc to start your career. Depending upon your subject of interest you could select any of the streams mentioned above and start building your career in that stream.