Karta
Usually it is the seniormost person who is the Karta but in few circumstances even a junior person can act like Karta. The circumstances are such:-
1. Karta is unavailable. Temporary absence is not enough
2. Whereabouts of Karta are unknown for a considerable period of time.
3. When Karta is absent due to calamity or distress
4. When Karta expressly relinquishes his right as a Karta and everyone agress to making a junior person a Karta. If anyone disagrees then the next male in line would be Karta.
Post 2005 amendment even females can be Karta.