Some bacteria are facultative anaerobes, which usually produce atp by aerobic respiration but are also capable of switching to fermentation when there is a lack of in their environment. a) water b) oxygen c) glucose d) carbon dioxide

Ans.

Facultative anaerobes are those organisms that can survive in both the absence or presence of oxygen in their surrounding. Bacteria that belong to this group show aerobic respiration to make ATP molecues, when oxygen is present in their environment. When oxygen is absent, they switch to anaerobic respiration, which involves ATP formation by the process of fermentation.

Thus, the correct answer is 'option B). oxygen.'

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.