Questions & Answers
Browse all 20 questions from the
Advanced Viticulture and Oenology Quiz study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which specific enzyme is primarily responsible for the breakdown of malic acid into lactic acid and carbon dioxide during malolactic fermentation?
-
A
Amylase
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B
Lipase
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C
Lactase
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D
Malolactic enzyme (decarboxylase)
2
What is the principal phenolic compound responsible for the astringency and bitterness in red wines?
-
A
Resveratrol
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B
Anthocyanin
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C
Quercetin
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D
Tannin
3
The 'noble rot' that enhances sweetness and complexity in certain dessert wines is caused by which type of fungus?
-
A
Botrytis cinerea
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B
Phytophthora infestans
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C
Uncinula necator
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D
Erysiphe necator
4
Which soil type, characterized by its fine particles and excellent water retention but poor drainage, is common in some of Burgundy's most esteemed vineyards?
-
A
Sandy loam
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B
Clay (Argile)
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C
Gravel
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D
Chalk
5
What is the minimum percentage of a specific grape variety, as mandated by EU regulations for most quality wine designations, that must be present in a wine to be labeled as such?
6
In winemaking, what is the process called where grape skins are intentionally broken to release more juice during the initial stages of fermentation?
-
A
Punching down
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B
Remontage (pumping over)
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C
Délestage (rack and return)
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D
Maceration
7
Which specific compound, often described as 'green bell pepper' or 'vegetal', is a methoxypyrazine that contributes to the aroma profile of certain grape varietals like Cabernet Sauvignon and Sauvignon Blanc?
-
A
Diacetyl
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B
Ethyl acetate
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C
Isobutyl methoxypyrazine (IBMP)
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D
Geraniol
8
What is the critical soil pH range for optimal yeast activity during fermentation?
-
A
3.0-3.5
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B
4.0-4.5
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C
5.0-5.5
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D
6.0-6.5
9
Which of the following is NOT a primary component of wine's aroma profile?
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A
Esters
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B
Terpenes
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C
Volatile thiols
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D
Minerals
10
What is the primary purpose of 'égerage' (lees stirring) in winemaking, particularly for white wines like Chardonnay?
-
A
To clarify the wine by settling solids
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B
To increase the wine's acidity
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C
To impart nutty, bready, and savory complexity
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D
To speed up fermentation
11
Which grape varietal is the primary red grape used in the production of Port wine?
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A
Touriga Nacional
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B
Syrah
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C
Tempranillo
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D
Grenache
12
What is the scientific term for the process of yeast converting sugar into ethanol and carbon dioxide?
-
A
Glycolysis
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B
Respiration
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C
Fermentation
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D
Oxidation
13
Which ancient civilization is widely credited with the earliest systematic cultivation of grapevines and production of wine on a significant scale?
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A
Romans
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B
Greeks
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C
Egyptians
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D
Phoenicians
14
What is the primary function of tannins in red wine aging?
-
A
To provide sweetness
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B
To act as antioxidants and promote structure
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C
To increase acidity
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D
To add fruity aromas
15
Which region is famous for its dry, aromatic white wines made primarily from the Riesling grape, known for high acidity and potential for long aging?
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A
Bordeaux
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B
Tuscany
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C
Mosel
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D
Rioja
16
What is the principal grape varietal used in the production of Champagne?
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A
Chardonnay
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B
Pinot Noir
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C
Meunier
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D
All of the above (often a blend)
17
The process of removing grape stems before fermentation is called:
-
A
Crushing
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B
Destemming
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C
Pressing
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D
Maceration
18
Which of the following is a yeast nutrient commonly added during fermentation to ensure a healthy and complete conversion of sugar to alcohol?
-
A
Potassium sorbate
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B
Sulfur dioxide
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C
Diammonium phosphate (DAP)
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D
Tartaric acid
19
What is the primary reason for the characteristic nutty and sherry-like aromas that can develop in wines aged under a 'flor' (a veil of yeast)?
-
A
Oxidation
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B
Reduction
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C
High temperatures
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D
Extended oak aging
20
Which is the most widely planted grape varietal in the world, both for wine and table grape production?
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A
Merlot
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B
Cabernet Sauvignon
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C
Chardonnay
-
D
Cabernet Franc
