Question

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

Answer 1

Anaerobic Respiration is the type of Respiration which occurrs in absence of oxgen Glucose breakdown in intially results in the formation of Pyruvate + energy

In human cells it results in the formation of 
lactic acid + energy 
and in the cells of yeast 
In the formation of ethanol +carbon dioxide + energy
In yeast and humans cells the breakdown Pyruvate occurs in the absence of oxygen this is also known as cellular respiration