Organisms use the energy they produce to perform different functions. which function would polar bears and orange trees not use energy for?
homeostasis
bioluminescence
building cell parts
moving molecules

bioluminescence

Organisms use energy that they got from a plant or a prey to perform different functions like move, respond to stimuli, develop, cell repair and growth, homeostasis and other processes. Hence, orange trees and polar bears won't use energy on bioluminescence since they don't have need it. 

Processes above and be sure to mention the movement of electrons and energy as the carbon atom moves from one reaction to another.