| Respiration | Combustion |
| $(1)$ It is a biochemical process. | $(1)$ It is a physiochemical process. |
| $(2)$ It occurs in living cells. | $(2)$ It does not occur in living cells. |
| $(3)$ $ATP$ is generated. | $(3)$ $ATP$ is not generated. |
| $(4)$ Enzymes are required. | $(4)$ Enzymes are not required. |
| $(5)$ It is a biologically-controlled process. | $(5)$ It is an uncontrolled process. |
| Glycolysis | Krebs' cycle |
| $(1)$ It is a linear pathway. | $(1)$ It is a cyclic pathway. |
| $(2)$ It occurs in the cytoplasm. | $(2)$ It occurs in the mitochondrial matrix. |
| $(3)$ It occurs in both aerobic and anaerobic respiration. | $(3)$ It occurs only in aerobic respiration. |
| $(4)$ It generates $2$ $NADH$ and $2$ $ATP$ molecules per glucose. | $(4)$ It produces $6$ $NADH$, $2$ $FADH_2$, and $2$ $ATP$ per two acetyl-$CoA$ molecules. |
| Aerobic respiration | Fermentation |
| $(1)$ Oxygen is used for energy derivation. | $(1)$ Occurs in the absence of oxygen. |
| $(2)$ Occurs in the cytoplasm and mitochondria. | $(2)$ Occurs only in the cytoplasm. |
| $(3)$ End products are $CO_2$ and $H_2O$. | $(3)$ End products are ethyl alcohol and $CO_2$. |
| $(4)$ Complete oxidation of substrate occurs. | $(4)$ Incomplete oxidation of substrate occurs. |
| $(5)$ About $36$ $ATP$ molecules are produced. | $(5)$ Only $2$ $ATP$ molecules are produced. |
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