WSET DIPLOMA D1 EXAM ACTUAL EXAM | ALL QUESTIONS AND CORRECT ANSWERS PLUS
RATIONALES | VERIFIED ANSWERS | GRADED A+ | LATEST EXAM
Question 1
Which of the following North American grape species is most commonly used in the creation of
rootstocks due to its excellent resistance to lime-induced chlorosis?
A) Vitis labrusca
B) Vitis riparia
C) Vitis vinifera
D) Vitis berlandieri
E) Vitis rupestris
Correct Answer: D) Vitis berlandieri
Rationale: Vitis berlandieri is a North American species highly valued in viticulture for its
ability to tolerate high levels of calcium carbonate (lime) in the soil. While V. riparia and V.
rupestris are also used for rootstocks, they have poor lime tolerance. V. berlandieri is often
hybridized with them to provide resistance to both phylloxera and lime-induced chlorosis.
Question 2
What are the four primary sections that constitute the structure of a grapevine?
A) Shoots, lateral shoots, buds, and fruit
B) Trunk, arms, cordons, and canes
C) Main shoots, one-year-old wood, permanent wood, and roots
D) Canopy, inflorescences, tendrils, and leaves
E) Phloem, xylem, pith, and bark
Correct Answer: C) Main shoots, one-year-old wood, permanent wood, and roots
Rationale: The anatomy of a vine is categorized into these four functional sections. Main
shoots support the current season's growth; one-year-old wood supports the buds for the
following year; permanent wood (trunk/arms) provides structure and storage; and roots
provide anchorage and nutrient uptake.
Question 3
The "canopy" of a vine is technically defined as comprising which structures?
A) Only the leaves and the grape bunches
B) The trunk and the permanent wood structures
C) The roots and the underground storage systems
D) The main shoots and their major structures including stems, buds, leaves, laterals, tendrils,
and fruit
E) Only the sections of the vine that are removed during winter pruning
Correct Answer: D) The main shoots and their major structures including stems, buds,
leaves, laterals, tendrils, and fruit
Rationale: The canopy refers to the entire above-ground green portion of the vine that
, 2
grows during the season. This includes everything attached to the main shoots, such as the
photosynthetic machinery (leaves) and the reproductive organs (inflorescences/bunches).
Question 4
During which season do the main shoots of a vine begin to grow, and from what structure do
they emerge?
A) Summer; from lateral buds
B) Spring; from prompt buds
C) Spring; from compound buds retained from the previous year
D) Winter; from the permanent wood
E) Autumn; from the roots
Correct Answer: C) Spring; from compound buds retained from the previous year
Rationale: Main shoots emerge during budburst in the spring. They grow from the
compound (dormant) buds that were formed during the previous growing season and
remained on the one-year-old wood (canes or spurs) throughout the winter.
Question 5
Where does a grapevine primarily store its carbohydrate reserves (starch) to survive the winter
and support early spring growth?
A) Only in the leaves
B) In the stems, trunks, and roots
C) Inside the grape skins
D) In the lateral shoots only
E) In the tendrils
Correct Answer: B) In the stems, trunks, and roots
Rationale: Vines are deciduous perennials. During the late season and dormancy, they move
energy (carbohydrates) from the leaves into the woody parts of the vine (permanent wood
and roots) to act as a battery for the next season's initial growth burst before
photosynthesis can begin.
Question 6
The process by which green, flexible shoots turn into woody, rigid, brown canes is known as:
A) Photosynthesis
B) Veraison
C) Lignification
D) Respiration
E) Transpiration
Correct Answer: C) Lignification
Rationale: Lignification (or "lignifying") occurs at the end of the summer. The green shoots
accumulate lignin, becoming hard and woody. This protects the tissues and the compound
buds within them from freezing temperatures during the dormant winter period.
, 3
Question 7
Where specifically do buds form on a grapevine?
A) At the tip of the roots
B) On the underside of the leaves
C) Between the leaf stalk (petiole) and the stem
D) Directly out of the permanent wood trunk
E) Only on lateral shoots
Correct Answer: C) Between the leaf stalk (petiole) and the stem
Rationale: Buds form in the "axil," which is the angle between the petiole (leaf stalk) and
the shoot stem. This positioning ensures that as the shoot grows, a bud is produced at every
node, providing potential for future growth.
Question 8
What is the primary difference between a "compound bud" and a "prompt bud"?
A) Compound buds produce fruit, while prompt buds produce only leaves.
B) Compound buds form in one season and break the next; prompt buds form and break in the
same season.
C) Prompt buds are found in the roots, while compound buds are on the trunk.
D) Compound buds are larger and only found on Vitis labrusca.
E) There is no difference; the terms are interchangeable.
Correct Answer: B) Compound buds form in one season and break the next; prompt buds
form and break in the same season.
Rationale: Compound buds (latent buds) contain a primary, secondary, and tertiary bud for
the following year. Prompt buds, however, break open immediately during the season they
are formed to create lateral shoots.
Question 9
What is the primary biological function of lateral shoots for the grapevine?
A) To produce the highest quality wine grapes
B) To act as the main trunk of the vine
C) To allow the plant to continue growing if the tip of the main shoot is damaged
D) To absorb water from the atmosphere
E) To store starch during the winter
Correct Answer: C) To allow the plant to continue growing if the tip of the main shoot is
damaged
Rationale: Laterals serve as a backup system. If the "apical dominance" of the main shoot is
lost (due to hedging or animal browsing), the lateral shoots take over the growth to ensure
the vine continues to expand its canopy for photosynthesis.
Question 10
The "second crop" refers to fruit that grows on:
, 4
A) The roots of the vine
B) The trunk of the vine during winter
C) Lateral shoots
D) Permanent wood older than 3 years
E) The secondary buds of a compound bud in early spring
Correct Answer: C) Lateral shoots
Rationale: Lateral shoots can produce their own inflorescences. Because they develop later
than the main shoots, this "second crop" is usually under-ripe and high in acid at the time
of the main harvest, often leading to quality issues if not removed via green harvesting.
Question 11
In viticulture, "one-year-old wood" is defined as:
A) Wood that has been on the vine for exactly 12 months from today
B) Shoots from the current growing season
C) Shoots from the previous growing season that have lignified and been kept at pruning
D) The trunk of a vine that is only one year old
E) Rootstocks before they are grafted
Correct Answer: C) Shoots from the previous growing season that have lignified and been
kept at pruning
Rationale: One-year-old wood is critical because it supports the compound buds that will
produce the current year's fruit. Depending on the pruning style, this wood is referred to as
either a "cane" (long) or a "spur" (short).
Question 12
Where is the highest concentration of a grapevine's root system typically found?
A) In the bottom 2 meters of soil
B) Clinging to the surface of the trunk
C) In the top 50cm of the soil
D) In the parent rock material
E) Only in the areas directly beneath the irrigation drippers
Correct Answer: C) In the top 50cm of the soil
Rationale: While roots can grow several meters deep to find water, the majority of the
"feeder roots" responsible for nutrient and water uptake are located in the upper 50cm of
the soil, where oxygen, nutrients, and moisture are most accessible.
Question 13
How does Pinot Noir clone 115 differ from Pinot Noir clone 521 in terms of viticultural
characteristics?
A) 115 is high yield; 521 is low yield.
B) 115 has large grapes for sparkling wine; 521 has small grapes for red wine.
C) 115 has low yields and small grapes for high-quality red wine; 521 has higher yields for
RATIONALES | VERIFIED ANSWERS | GRADED A+ | LATEST EXAM
Question 1
Which of the following North American grape species is most commonly used in the creation of
rootstocks due to its excellent resistance to lime-induced chlorosis?
A) Vitis labrusca
B) Vitis riparia
C) Vitis vinifera
D) Vitis berlandieri
E) Vitis rupestris
Correct Answer: D) Vitis berlandieri
Rationale: Vitis berlandieri is a North American species highly valued in viticulture for its
ability to tolerate high levels of calcium carbonate (lime) in the soil. While V. riparia and V.
rupestris are also used for rootstocks, they have poor lime tolerance. V. berlandieri is often
hybridized with them to provide resistance to both phylloxera and lime-induced chlorosis.
Question 2
What are the four primary sections that constitute the structure of a grapevine?
A) Shoots, lateral shoots, buds, and fruit
B) Trunk, arms, cordons, and canes
C) Main shoots, one-year-old wood, permanent wood, and roots
D) Canopy, inflorescences, tendrils, and leaves
E) Phloem, xylem, pith, and bark
Correct Answer: C) Main shoots, one-year-old wood, permanent wood, and roots
Rationale: The anatomy of a vine is categorized into these four functional sections. Main
shoots support the current season's growth; one-year-old wood supports the buds for the
following year; permanent wood (trunk/arms) provides structure and storage; and roots
provide anchorage and nutrient uptake.
Question 3
The "canopy" of a vine is technically defined as comprising which structures?
A) Only the leaves and the grape bunches
B) The trunk and the permanent wood structures
C) The roots and the underground storage systems
D) The main shoots and their major structures including stems, buds, leaves, laterals, tendrils,
and fruit
E) Only the sections of the vine that are removed during winter pruning
Correct Answer: D) The main shoots and their major structures including stems, buds,
leaves, laterals, tendrils, and fruit
Rationale: The canopy refers to the entire above-ground green portion of the vine that
, 2
grows during the season. This includes everything attached to the main shoots, such as the
photosynthetic machinery (leaves) and the reproductive organs (inflorescences/bunches).
Question 4
During which season do the main shoots of a vine begin to grow, and from what structure do
they emerge?
A) Summer; from lateral buds
B) Spring; from prompt buds
C) Spring; from compound buds retained from the previous year
D) Winter; from the permanent wood
E) Autumn; from the roots
Correct Answer: C) Spring; from compound buds retained from the previous year
Rationale: Main shoots emerge during budburst in the spring. They grow from the
compound (dormant) buds that were formed during the previous growing season and
remained on the one-year-old wood (canes or spurs) throughout the winter.
Question 5
Where does a grapevine primarily store its carbohydrate reserves (starch) to survive the winter
and support early spring growth?
A) Only in the leaves
B) In the stems, trunks, and roots
C) Inside the grape skins
D) In the lateral shoots only
E) In the tendrils
Correct Answer: B) In the stems, trunks, and roots
Rationale: Vines are deciduous perennials. During the late season and dormancy, they move
energy (carbohydrates) from the leaves into the woody parts of the vine (permanent wood
and roots) to act as a battery for the next season's initial growth burst before
photosynthesis can begin.
Question 6
The process by which green, flexible shoots turn into woody, rigid, brown canes is known as:
A) Photosynthesis
B) Veraison
C) Lignification
D) Respiration
E) Transpiration
Correct Answer: C) Lignification
Rationale: Lignification (or "lignifying") occurs at the end of the summer. The green shoots
accumulate lignin, becoming hard and woody. This protects the tissues and the compound
buds within them from freezing temperatures during the dormant winter period.
, 3
Question 7
Where specifically do buds form on a grapevine?
A) At the tip of the roots
B) On the underside of the leaves
C) Between the leaf stalk (petiole) and the stem
D) Directly out of the permanent wood trunk
E) Only on lateral shoots
Correct Answer: C) Between the leaf stalk (petiole) and the stem
Rationale: Buds form in the "axil," which is the angle between the petiole (leaf stalk) and
the shoot stem. This positioning ensures that as the shoot grows, a bud is produced at every
node, providing potential for future growth.
Question 8
What is the primary difference between a "compound bud" and a "prompt bud"?
A) Compound buds produce fruit, while prompt buds produce only leaves.
B) Compound buds form in one season and break the next; prompt buds form and break in the
same season.
C) Prompt buds are found in the roots, while compound buds are on the trunk.
D) Compound buds are larger and only found on Vitis labrusca.
E) There is no difference; the terms are interchangeable.
Correct Answer: B) Compound buds form in one season and break the next; prompt buds
form and break in the same season.
Rationale: Compound buds (latent buds) contain a primary, secondary, and tertiary bud for
the following year. Prompt buds, however, break open immediately during the season they
are formed to create lateral shoots.
Question 9
What is the primary biological function of lateral shoots for the grapevine?
A) To produce the highest quality wine grapes
B) To act as the main trunk of the vine
C) To allow the plant to continue growing if the tip of the main shoot is damaged
D) To absorb water from the atmosphere
E) To store starch during the winter
Correct Answer: C) To allow the plant to continue growing if the tip of the main shoot is
damaged
Rationale: Laterals serve as a backup system. If the "apical dominance" of the main shoot is
lost (due to hedging or animal browsing), the lateral shoots take over the growth to ensure
the vine continues to expand its canopy for photosynthesis.
Question 10
The "second crop" refers to fruit that grows on:
, 4
A) The roots of the vine
B) The trunk of the vine during winter
C) Lateral shoots
D) Permanent wood older than 3 years
E) The secondary buds of a compound bud in early spring
Correct Answer: C) Lateral shoots
Rationale: Lateral shoots can produce their own inflorescences. Because they develop later
than the main shoots, this "second crop" is usually under-ripe and high in acid at the time
of the main harvest, often leading to quality issues if not removed via green harvesting.
Question 11
In viticulture, "one-year-old wood" is defined as:
A) Wood that has been on the vine for exactly 12 months from today
B) Shoots from the current growing season
C) Shoots from the previous growing season that have lignified and been kept at pruning
D) The trunk of a vine that is only one year old
E) Rootstocks before they are grafted
Correct Answer: C) Shoots from the previous growing season that have lignified and been
kept at pruning
Rationale: One-year-old wood is critical because it supports the compound buds that will
produce the current year's fruit. Depending on the pruning style, this wood is referred to as
either a "cane" (long) or a "spur" (short).
Question 12
Where is the highest concentration of a grapevine's root system typically found?
A) In the bottom 2 meters of soil
B) Clinging to the surface of the trunk
C) In the top 50cm of the soil
D) In the parent rock material
E) Only in the areas directly beneath the irrigation drippers
Correct Answer: C) In the top 50cm of the soil
Rationale: While roots can grow several meters deep to find water, the majority of the
"feeder roots" responsible for nutrient and water uptake are located in the upper 50cm of
the soil, where oxygen, nutrients, and moisture are most accessible.
Question 13
How does Pinot Noir clone 115 differ from Pinot Noir clone 521 in terms of viticultural
characteristics?
A) 115 is high yield; 521 is low yield.
B) 115 has large grapes for sparkling wine; 521 has small grapes for red wine.
C) 115 has low yields and small grapes for high-quality red wine; 521 has higher yields for
