Hello, 

Animal Physiology is a subject in the syllabus for NEET. The weightage for this chapter is 2.5% therefore, having a chance of 1-2 questions being asked in the exam. 

Chapters like Human Physiology and Genetics and Evolution have a higher weightage. 

Please visit the following link for more details. 

https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics

Good luck!