WSET Level 2 Practice Question · Episode 19
Show Answer & Explanation (try the quiz first)
Practice Question
When maturing wine in an oak vessel, what is the most significant physical/chemical difference compared to maturation in an 'Inert' vessel (e.g., stainless steel)?
- A. The wine is completely shielded from oxygen, keeping fruit flavours fresher.
- B. Minute amounts of oxygen (Micro-oxygenation) pass through the wood, softening tannins and adding complexity.
- C. The alcohol by volume (ABV) naturally increases during the aging process.
- D. The acidity of the wine increases dramatically due to contact with the wood.
Answer & Explanation
Answer: B. Minute amounts of oxygen (Micro-oxygenation) pass through the wood, softening tannins and adding complexity. Explanation: Oak vessels are slightly porous, allowing tiny amounts of oxygen to interact with the wine. This process of Micro-oxygenation helps the harsh tannins in red wine to soften and polymerize (become smoother). Additionally, the oak itself imparts complex tertiary flavours such as vanilla, cedar, and toast. Conversely, Inert vessels like stainless steel completely block oxygen, with the primary aim of preserving the wine’s pure Primary fruit characteristics and vibrant acidity.
Expert Exam Tip
[Trap]: Do not assume that "Oak maturation automatically implies higher quality." For delicate varieties, excessive oak can overshadow the subtle fruit nuances, potentially lowering the wine’s overall balance and quality. [Tip]: In the L2 exam, if you see the terms 'Oxygen Interaction' or 'Softening Tannin', immediately link them to 'Oak Maturation.' Think of oak as the 'Lungs' that allow the wine to breathe and mature gracefully.