A porcupine eats 3000 J of plant material. Of this, 2100 J is indigestible and is eliminated as feces, 800 J are used in cellular respiration, and 100 J are used for growth and reproduction. What is the approximate production efficiency of this animal?

A) 0.03%
B) 3%
C) 10%
D) 33%

Dear student,
Answer: B
Total calories the animal consumes = 3000J
Energy used for growth = 100 J 
Production efficiency = 100/3000 = 0.0333
Production efficiency in percentage = 0.033*100= 3.3 % 

Regards

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