9) F

Sentence 2 helps us to identify the type of enzyme.

  • Amylase breaks starch into glucose
  • Lipase breaks lipids into fatty acids and glycerol
  • Proteases breaks proteins into amino acids

Hence, the enzyme is protease. This rules out options A, B, C and D.

Sentence 1 helps us to know that pH is acidic. We know that the stomach secrets hydrochloric acid. Therefore, the answer is F ‘protease from the stomach’