Fill n the blanks with the word or expressions given below, and change the form where necessary . donate carry out draw result efficiency different consume extreme capable use (a) This is in contrast to cellular respiration, where electrons _____ to an exogenous electron acceptor. ( b ) Fermentation does not necessarily have to_____ in an anaerobic environment. ( c ) Utilization of wastewater as a potential substrate for biohydrogen production has _____ considerable interest in recent years especially in dark fermentation process. (d) Fermentation occurs in mammalian muscle during periods of intense exercise where oxygen supply becomes limited,______ in the creation of lactic acid. ( e ) A consequence is that the production of adenosine triphosphate (ATP) by fermentation is less_____ than oxidative phosphorylation. less efficient. ( f ) _____ wastewater as a fermentable substrate facilitates both wastewater treatment apart from H 2 production. ( g ) The physiological _____ between H 2 producing bacteria and H 2 consuming bacteria form the fundamental basis. ( h ) Typical anaerobic mixed cultures can not produce H 2 as it is rapidly _____ by the methane-producing bacteria. (i) Employing mixed culture is _____ important and well-suited to the non-sterile, ever-changing, complex environment of wastewater treatment. (j) When parent inoculum was exposed to extreme environments such as high temperature, extreme acidity and alkalinity, spore forming H 2 producing bacteria, but methanogens had no such_____.