Answer : True.
Explanation : The energy which we get after consumption of food is utilized for performing metabolic processes in the consumers; Which reduces the efficiency of secondary productivity.
Many organisms perform various metabolic processes like catabolic or anabolic activities in the cells using the energy which is obtained from the food that an organism consumes. The food nutrients are broken down into many smaller compounds.
This process reduces the secondary efficiency which includes; generation of biomass of consumers as organisms in a trophic system.