Answer:
Substrate-level
phosphorylation is a type of metabolic reaction that results in the formation
of Adenosine Triphosphate (ATP) or Guanosine Triphosphate (GTP) by the direct transfer
and donation of a phosphoryl 
group
to Adenosine Diphosphate (ADP) or Guanosine Diphosphate (GDP) from a
phosp'horylated reactive intermediate.
In
glycolysis substrate level phosphorylation occurs in following two reactions 2
molecules of 1, 3-diphosphoglyceric acid react with 2 molecules of ADP to form 2
molecules of 3-phosphoglyceric acid and 2 molecules of ATP . 
2 molecules
of phosphoenolpyruvic acid reacts with 2 molecules of ADP to form 2 molecules
of pyruvic acid and 2 ATP. 
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