Hi Aspirant,

CSIR NET Exam is conducted only for Science stream candidates.CSIR NET has 3 parts, part a contains general aptitude, part b and c contains the subject opted by the student.

CSIR NET includes 5 subjects, they are:

1.Life science

2.Earth science

3.physical science

4.Environmental science

5.chemical science

You can choose life science subject as it is related to botany, zoology, microbiology etc...

You can refer this link for more information

https://competition.careers360.com/articles/csir-ugc-net/amp

Hope this helps