Question

In Biology what is the main difference between aerobic respiration and anaerobic respiration?

Answer 1

 aerobic respiration takes place in the presence of oxygen and respiratory substrate gets completely oxidised to carbon dioxide and water
anaerobic respiration takes place in the absence of oxygen and respiratory substrate gets incompletly oxidised 

Answer 2

Aerobic respiration
It occurs in the presence of O2.
It occurs in the cytoplasm and mitochondria.
It always releases CO2 and H2O as end products.
It involves production of high energy i.e., 36 ATP.
C6H12O6= CO2+H2O+ATP(Energy)

Anaerobic respiration 
It occurs in the absence of CO2.
It occurs in the cytoplasm.
End products are mostly lactic acid and alcohol.
It involves production of less energy only 2 ATP
C6H12O6= lactic acid/alcohol+energy.