Hello Ravichandran!

Ecology and environment is a really interesting chapter in CBSE class 12th biology subject. The concept including primary and secondary productivity is GPP - RL = NPP i.e., gross primary productivity minus the respiratory losses equals net primary productivity. But, sorry to say, in order to get the answer of the question you have asked, you would have to restructure your question. The question is not clear about what do you want to find out. It's a request , kindly restructure your question and ask again. We are ready to help you 24/7.

Good luck!