What are the different ways in which glucose is oxidised to provide energy in various organisms?

Explanation

At first glucose (6 carbon molecules ) is broken in the cytopasm of cells of all organisms. This process yields a 3 carbon molecule compound called pyruvate.
Further break down of pyruvate takes place in different manners in different organisms.

`to` Anaerobis Respiration: This process takes place in absence of oxygen, e.g. in yeast durring fermentionl. In this case, pyruvate is converted into ethanol and carbon dioxide.
`to` Aerobic Respiration: In aerobic respiration, the breakdown of pyruvate takes place in presence of oxygen to give rise to 3 molecules of carbon dioxide and water. The release of energy in aerobic respiration is much more than anaerobic resipration.
`to` Lack of Oxygen: Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid (3 carbon molecule compounds). Formation of lactic acid in muscles causes cramp.