Is it mandatory to take GRE exam for pursuing Phd in toxicology in the USA?

Question

i completed masters in biotechnology from india with 71% n IELTS with 7.5 bands n i am eager to study further.

Answer 1

No, but it will certainly help. I took it and I highly recommend it, but to answer your question, no, it is not mandatory.

Answer 2

Since you are from India, almost all the schools require GRE. For PhD, you will need GRE.

You could get admission without GRE in very low profile university, but studying in low profile school for PhD is not worth.

To get student visa, you will need GRE.