Question

explain the ways in which glucose is broken down in absence of oxygen

Answer 1

In absence of oxygen glucose is broken down into ethanol. and the process is known as fermentation

Answer 2

break down of glucose a 6 carbon molecule into a 3 carbon molecule is called pyruvate. when there is lack of oxygen then the glucose id broken down by lactic acid which is also a 3 carbon molecule. Sudden build up of lactic acid on muscle cell may lead to cramps.