Honorarium paid by ngo (religious trust) to its full time missionaries - taxability

What is the taxability of honorarium paid by a religious trust like ISKCON to its Full time missionaries?

Under which head are they taxable?

& what about the taxability of medical insurance facility, Children education reimbursement, reimbursement of travelling cost for pilgrimage, pilgrimage allowance once in a year, accomodation etc. provided by NGO?