There are two types of respiration: Aerobic respiration: takes place in presence of Oxygen to produce ATP. The electron transport chain helps to convert NADH and FADH2 in to ATP. Most of the ATP produced by cellular respiration are made with the help of Oxidative phosphorylation. Anaerobic respiration where electron acceptors are other than oxygen .In anaerobes less oxidizing agents are used such as nitrates where substrate level phosphorylation is used to produce ATP. Based on the above descriptions, the correct answers are: a. Aerobic respiration: Substrate level phosphorylation b. Anaerobic respiration with nitrate used as the terminal electron acceptor: Substrate level phosphorylation c. Embden Meyerhoff pathway for glucose catabolism: Oxidative phosphorylation d. Anaerobic respiration with iron used as the terminal electon acceptor: Substrate level phosphorylation Solution There are two types of respiration: Aerobic respiration: takes place in presence of Oxygen to produce ATP. The electron transport chain helps to convert NADH and FADH2 in to ATP. Most of the ATP produced by cellular respiration are made with the help of Oxidative phosphorylation. Anaerobic respiration where electron acceptors are other than oxygen .In anaerobes less oxidizing agents are used such as nitrates where substrate level phosphorylation is used to produce ATP. Based on the above descriptions, the correct answers are: a. Aerobic respiration: Substrate level phosphorylation b. Anaerobic respiration with nitrate used as the terminal electron acceptor: Substrate level phosphorylation c. Embden Meyerhoff pathway for glucose catabolism: Oxidative phosphorylation d. Anaerobic respiration with iron used as the terminal electon acceptor: Substrate level phosphorylation.