I have dealt with pancha mahA yajnAs here I am addressing the question on funeral rites in that background. Evolution of manuSya The Universe is a ‘Yajna’ a sacrifice performed by Atma, sacrificing a Purusha. In this yajna, manuSya has evolved. Purusha suktam says all this Universe including the planets and beings came from the Purusha. Purusha is spacetime filled with huge energy, which was just constrained to be 10 angulas. Only 1/4th of that energy is manifest in this Universe. 3/4th is Hidden. From this purusha, rudras, adityas and Vasus came. Rudras are force-fields in which energy manifests and creates fundamental particles like quarks and leptons. Adityas are binding energies that bind fundamental particles and form basic units of matter like nucleus and atom. Vasus are atomic elements, molecules that exist in eight different states. From the Vasus pitrs evolve. Pitrs are complex forms and structures of matter with dark matter in them. ...