WSET DIPLOMA D1 COMPREHENSIVE
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Number of known grape varieties in the world.
Answer: Over 1,000
◍ Majority of global grape varieties belong to what species.
Answer: Vitis Vinifera
◍ Vitis Vinifera is indigenous to where.
Answer: Eurasia
◍ What grape varietal species is indigenous to Eurasia.
Answer: Vitis Vinifera
◍ Where are North American grape species used for production?.
Answer: New York state
◍ What is the main function of N. American grape species globally?.
Answer: Rootstocks for grafting vitis vinifera onto
◍ What are the most important N. American grape species (4)?.
Answer: Vitis LabruscaVitis RipariaVitis BerlandieriVitis Rupestris
◍ Anatomy of the Vine (4).
Answer: Main shootsOne-year-old woodPermanent woodRoots
◍ What are the major structures of the main shoots.
Answer: Stembudleaveslateral shootstendrilsInflorescences / grape bunches
◍ What does the canopy refer to?.
Answer: Main shoots and their major structures
◍ Where do main shoots grow from?.
, Answer: Buds retain from prior year
◍ What does the stem do for its structures (3)?.
Answer: Structure components attach toTransports water and solutes to/from
structuresStore of carbohydrates
◍ What are in the solutes in stems?.
Answer: Sugars and minerals
◍ What are nodes on a stem?.
Answer: Swellings where structures are attached
◍ What are internodes?.
Answer: Length of stem between nodes
◍ What does lignify mean?.
Answer: Green shoots become woody, rigid, and turn brown
◍ What is a cane?.
Answer: A lignified shoot
◍ What are the two types of buds?.
Answer: Compound/latentPrompt
◍ What does a bud contain?.
Answer: All the green parts; stem, buds, tendrils, leaves, inforescences
◍ What is another name for compound buds.
Answer: Latent buds
◍ When do compound buds form and break open?.
Answer: Form in year 1 and break open in year 2 (if retained)
◍ What do compound buds produce?.
Answer: Main shoots in the following growing season
◍ What types of buds are contained within a compound bud?.
Answer: Primary bud (main growing point)Secondary budsTertiary buds
◍ What is the purpose of secondary and tertiary buds.
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Number of known grape varieties in the world.
Answer: Over 1,000
◍ Majority of global grape varieties belong to what species.
Answer: Vitis Vinifera
◍ Vitis Vinifera is indigenous to where.
Answer: Eurasia
◍ What grape varietal species is indigenous to Eurasia.
Answer: Vitis Vinifera
◍ Where are North American grape species used for production?.
Answer: New York state
◍ What is the main function of N. American grape species globally?.
Answer: Rootstocks for grafting vitis vinifera onto
◍ What are the most important N. American grape species (4)?.
Answer: Vitis LabruscaVitis RipariaVitis BerlandieriVitis Rupestris
◍ Anatomy of the Vine (4).
Answer: Main shootsOne-year-old woodPermanent woodRoots
◍ What are the major structures of the main shoots.
Answer: Stembudleaveslateral shootstendrilsInflorescences / grape bunches
◍ What does the canopy refer to?.
Answer: Main shoots and their major structures
◍ Where do main shoots grow from?.
, Answer: Buds retain from prior year
◍ What does the stem do for its structures (3)?.
Answer: Structure components attach toTransports water and solutes to/from
structuresStore of carbohydrates
◍ What are in the solutes in stems?.
Answer: Sugars and minerals
◍ What are nodes on a stem?.
Answer: Swellings where structures are attached
◍ What are internodes?.
Answer: Length of stem between nodes
◍ What does lignify mean?.
Answer: Green shoots become woody, rigid, and turn brown
◍ What is a cane?.
Answer: A lignified shoot
◍ What are the two types of buds?.
Answer: Compound/latentPrompt
◍ What does a bud contain?.
Answer: All the green parts; stem, buds, tendrils, leaves, inforescences
◍ What is another name for compound buds.
Answer: Latent buds
◍ When do compound buds form and break open?.
Answer: Form in year 1 and break open in year 2 (if retained)
◍ What do compound buds produce?.
Answer: Main shoots in the following growing season
◍ What types of buds are contained within a compound bud?.
Answer: Primary bud (main growing point)Secondary budsTertiary buds
◍ What is the purpose of secondary and tertiary buds.
