Abat respiration 1. It occurs in living cells. 2. Is in higher class plants. 3. No medium is required. 4. Glucose is used internally. 5. Efficacy of enzymes like carboxylase , dehydrogenase etc. occurs. . Alcohol and CO2 are stored inside the cell. Fermentation 1. It occurs outside of living cells. 2. Occurs only in lower class plants like fungi and bacteria. 3. Liquid medium is required . 4. External glucose is used. 5. Efficacy of an enzyme called Zyzyme occurs. . Alcohol and CO2 are stored outside the cell.