Explanation

Cyanide is a deadly poison of respiration and inhibit the activity of cytochrome-c oxidase complex (which contains cytochrome-a and cytochrome-$a_{3}$) of electron transport chain of aerobic respiration. Thus, no proton gradient will be established and no ATP will be formed. Along with as the reduction of NADH and FAD$H_{2}$ is also ceased due to blockage of ETS, the availability of hydrogen acceptors like NA$D^{+}$ and FAD is ceased for Krebs’ cycle and glycolysis. Cyanide resistance pathway is anaerobic respiration.