What is the normal value of extinction point (in $\%\, O_2$)?

During anaerobic conditions,the increase in the rate of glycolysis is known as:

In alcoholic fermentation,$NAD^+$ is produced during the

Which type of respiration do methanogenic bacteria exhibit?

The bacterial decomposition of nitrogenous organic compounds in the absence of abundant oxygen usually results in the formation of substances with an offensive odour,chiefly sulphur compounds. Such anaerobic decomposition is called:

Which one of the following can respire in the total absence of air (anoxybiosis)?