For the IIT JAM (Joint Admission Test for M.Sc.), the eligibility criteria for each program may vary depending on the IIT and the specific course you're applying for. Generally, for subjects like Biotechnology, Biological Sciences, or similar fields, having a background in subjects like Biology, Biotechnology, Chemistry, and Physics is often required.

Since you've taken Physics, Chemistry, and Zoology through IGNOU without Biotechnology, you may still be eligible to appear for IIT JAM in certain subjects, depending on the specific requirements of the course you are interested in.

-Some programs may require specific courses or a combination of subjects like Biology, Chemistry, Physics, etc. If your subjects match the required criteria, you can apply.

-If you're unsure about your eligibility due to your specific subject combination, it's best to directly contact the IIT JAM authorities or the specific IIT you're interested in for clarification.