Question -
Answer -
(a) Respirationand combustion
| Respiration | Combustion |
| 1. | It is a biochemical process. | 1. | It is a physiochemical process. |
| 2. | It occurs in the living cells. | 2. | It does not occur in the 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. |
(b) Glycolysis andKrebs cycle
| Glycolysis | Krebs cycle |
| 1. | It is a linear pathway. | 1. | It is a cyclic pathway. |
| 2. | It occurs in the cell cytoplasm. | 2. | It occurs in the mitochondrial matrix. |
| 3. | It occurs in both aerobic and anaerobic respiration. | 3. | It occurs in aerobic respiration. |
| 4. | It generates 2 NADH2 and 2 ATP molecules on the breakdown of one glucose molecule. | 4. | It produces 6 NADH2, 2FADH2, and 2 ATP molecules on the breakdown of two acetyl-CoA molecules. |
(c) Aerobicrespiration and fermentation
| Aerobic respiration | Fermentation |
| 1. | Oxygen is used for deriving energy | 1. | Occurs in the absence of oxygen |
| 2. | Occurs in the cytoplasm and mitochondria | 2. | Occurs in the cytoplasm |
| 3. | End products are carbon dioxide and water | 3. | End products are ethyl alcohol and carbon dioxide |
| 4. | Complete oxidation of the respiratory substrate takes place | 4. | Incomplete oxidation of the respiratory substrate takes place |
| 5. | About 36 ATP molecules are produced | 5. | Only 2 ATP molecules are produced |