How do i define the efficiency of respiration in words

Since this is not my area of expertise, I searched Google under the key words "plant respiration" to get these possible sources:

http://www.sciencedaily.com/releases/2004/07/040723093305.htm
http://photoscience.la.asu.edu/photosyn/books/Lambers-PlantRes-Bk.html
http://www.answers.com/topic/plant-respiration

I hope this helps. If not, add "efficiency" to the previous key words and repeat the search. Thanks for asking.

thnaks i am able to put things together now