Hi Shubha,

NEET syllabus for Biology include topics from Class 11th and Class 12th. In the unit 'Structural Organisation in Plants and Animals' there is a topic Animal tissues which will consist of  Morphology, anatomy and functions of different systems (digestive, circulatory, respiratory, nervous and reproductive) of an insect (cockroach).

So for NEET you have to study only about cockroach(in brief).

For PDF of syllabus of Biology for NEET you can visit the link given below:-

https://images.careers360.mobi/sites/default/files/NEET-2019-Syllabus-Biology.pdf

Hope this will help,please feel free to ask if you have any further queries.

Thank You.