In the citric acid cycle, atp molecules are produced by in the citric acid cycle, atp molecules are produced by substrate-level phosphorylation photosynthesis oxidative phosphorylation cellular respiration photophosphorylation

substrate-level phosphorylation

Explanation:

Substrate-level phosphorylation is the metabolic reaction which results in formation of energy currency molecules, ATP or GTP by direct transfer of a phosphoryl group to the ADP or GDP from the another phosphorylated compound.

In citric acid cycle, Succinyl-CoA in the presence of succinyl-CoA synthase is converted to succinate. Condensation reaction (Substrate-level phosphorylation) of GDP and Pi takes place which results in the formation of GTP.