Yes, biology is compulsory for Iiser. Number of question asked from biology would be 14 with maximum marks if 45.
For more details about the exam please visit the following link
https://engineering.careers360.com/articles/iiser-admission/amp
College Comparison based on Courses, Placement, Rank, Fee
Eligibility | Application | Exam Pattern | Admit Card | Result | Answer Key | Counselling
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile