Hello Ataur, if i'm not wrong, you are asking about Jwaharlal Nehru University, Delhi.
JNU offers only foreign language courses in UG like, spanish, German, persian etc. They offer other MCA at PG level and apart from that humanities and third world studies at PG level.
It would be better for you to consider Delhi University, Punjab University, AMU and BHU for B.Sc.
Yes JNU Jaipur offers UG courses. You can take admission into programs like ;-
1) B.Sc (Agriculture)
2) B.Sc. (Clinical Dietetics)
3) B.Sc. (Hons.) Bioinformatics
4) B.Sc. (Hons.) Biotechnology
5) B.Sc. (Hons.) Biotechnology (Integrated)
6) B.Sc. (Hons.) Home Science
7) B.Sc. (Hons.) in Biochemistry
8) B.Sc. (Hons.) in Microbiology
9) B.Sc. (Hospitality & Hotel Administration)
10) B.Sc. (PAT)
11) B.Sc. Animation
12) B.Sc. in Medical Lab Technology (MLT)
13) B.Sc. Nursing
14) B.Sc. Pass Course (CBZ)
15) B.Sc. Pass Course (PCM)
16) B.Sc.+M.Sc. Integrated Microbial Technology