Question

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

Answer 1

Cellular respiration -
Glucose-glycolysis-pyruvate-
1. Anaerobic - yeast - ethanol+CO2+2ATP (energy)

Answer 2

there are two ways of an aerobic break down of glucose first step is break down of glucose molecule into pyruvate which takes place in cytoplasm .The anaerobic break down in bacteria is called fermentation