Final answer:
During growth, organisms need energy and do work to rearrange and synthesize biomolecules. Maintenance of the organized state also requires energy.
Step-by-step explanation:
Growth is more energetically demanding than maintenance because during growth, organisms need energy to rearrange and synthesize biomolecules which contain more useful energy than the materials they are made from. This requires a supply of energy and work to be done. Even in the absence of growth, organisms still need energy to maintain their organized state, such as maintaining an electrical charge difference across a cell membrane, which requires energy.