The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is

Analyze the question: We need the enzyme responsible for fermentation, the conversion of glucose into ethanol and carbon (IV) oxide.

Explain the concept: Fermentation is the breakdown of sugar by yeast to produce alcohol and carbon (IV) oxide:

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

The enzyme complex in yeast that catalyses this is zymase.

Check each option:

• A. Diastase converts starch to maltose (found in germinating barley and malt). It is not for glucose.
• B. Maltase converts maltose to glucose. This happens before fermentation, not during it.
• C. Ptyalin is salivary amylase. It begins starch digestion in the mouth.
• D. Zymase converts glucose to ethanol and CO₂. This is the correct choice.

Answer: Zymase, option D.

Tip: Remember the chain for making alcohol: Starch → (diastase) → maltose → (maltase) → glucose → (zymase) → ethanol + CO₂

"Zymase = the Zippy yeast enzyme that makes the fizz (CO₂)."