Question

what are different ways in which glucose is oxidised to provide energy in various organisms

Answer 1

 At first glucose (6 carbon molecules) is broken in the cytoplasm 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. ... In this case pyruvate is converted into ethanol and carbon dioxide.

Answer 2

First in presence of oxygen : the products will be Carbon dioxide + water + energy

Second in lack of oxygen : products will be lactic acid + energy

Third in absence of oxygen : products will be Ethanol + carbon dioxide + energy