obsolete energy taxis in host environment true energy taxis in response to host environment GO:0052115 biological_process OBSOLETE. The directed movement of a motile cell or organism in the environment of its host organism in response to physical parameters involved in energy generation, such as light, oxygen, and oxidizable substrates. The host is defined as the larger of the organisms involved in a symbiotic interaction. This term was obsoleted because it represents both a process and a location.